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Unsaturated, thermosetting, brominated phthalic anhydride/polyol polyester resins are prepared by reacting brominated phthalic anhydride with polyol and an unsaturated polycarboxylic acid compound in the presence of an acid neutralizing agent under reaction conditions so as to form an unsaturated polyester resin product, the proportions of reactants being selected so as to provide, (i) at least about a 5:4 mole ratio of total moles of polyol to the sum of the moles of brominated phthalic anhydride, unsaturated polycarboxylic acid compound and any saturated polycarboxylic acid compounds in the reaction, and (ii) a bromine content of at least about 40 weight percent in the unsaturated polyester resin product.
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China Methyl Hexahydrophthalic Anhydride (MHHPA), Find details about China Mhhpa, Methyl Hexahydrophthalic Anhydride; from Methyl Hexahydrophthalic Anhydride (MHHPA) - Heze Kingvolt Chemical Co., Ltd.
A pre-design of plant to produce 45.000 tons/year phthalic anhydride from 47,200 tons/year ortho-xylene uses Davy McKee process with vanadium pentaoxide catalyst in non isothermal - non adiabatic fixed bed multitubes reactor that operated at 2 atm and 340-360oC. Phthalic anhydride is intermediate chemical that raw material ...
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Three glycerol:phthalic acid molar ratio used for the bulk polymerization were: 2:2 ; crystallinity for the polymers containing higher amounts of phthalic anhydride. The molecular structure of the polyesters is strongly influenced by the molar Chat Online ...
68308-78-1 - Castor oil, dehydrated, polymer with glycerol, maleic anhydride, phthalic anhydride, soybean oil, styrene and vinyltoluene - Searchable synonyms, formulas, resource links, and other chemical information.
68554-97-2 - Soybean oil, polymer with glycerol, maleic anhydride, phthalic anhydride and TDI - Searchable synonyms, formulas, resource links, and other chemical information.
Phthalic Anhydride Raw Material for production of plasticizers, polyester resins, alkyd resins used in paints and lacquers & certain dyes.
Phthalic anhydride is a white, crystalline solid with a characteristic choking odor. It is produced by the oxidation of either naphthalene or ortho-xylene, and it is a key industrial intermediate in the manufacture of resins, polyesters, dyes, and plasticizers. The major acute toxic effect of exposure to phthalic anhydride dust or vapor is its irritating action on the skin, eyes, and mucous membranes. The primary end use is the manufacture of plasticizers, with polyester resin production second. The major emission sources in descending order are product storage, manufacturing, end product manufacturing, and product handling. Scrubbers and incinerators are currently being used by industry to control phthalic anhydride emissions with efficiencies of 86 and 99 percent, respectively. Currently used practices to control the continuous gaseous effluent are the use of knock-out pots for removal of solid phthalic anhydride and the venting of storage tanks to the main process vent gas incinerator. Based ...
The reasonably valued phthalic anhydride and chemicals, dyes & solvents products we have is completed in china. hebei shun er chemical co.,ltd. can provide good quality industrial chemicals & supplies and various other china chemicals, dyes & solvents products, as they are a classified wholesaler. hebei shun er chemical co.,ltd. is a famous company in china that is trading in overall market ...
EINECS-Number: 201-607-5. Production method: Phthalic Anhydride is manufactured from ortho-xylene by air catalic oxidation in gas phase with vanadium-titanium catalyst.. ...
COVID-19 Outbreak-Global Phthalic Anhydride Industry Market Report-Development Trends, Threats, Opportunities and Competitive Landscape in 2020 is a market research report available at US $3660 for a Single User PDF License from RnR Market Research Reports Library.
W. K. HENZE RECOVERY OF PHTHALIC AND MALEIC ACID FROM SOLUTIONS Filed April l, 1962 W/LL/M K. HENZE BY /f/ b #uw ATT NEY Nov. 9, 1965 United Sntates Patent 3,216,481 RECOVERY F PHTHALIC AND MALEC ACID FROM SOLUTHONS William K. Henze, Marblehead, Mass., assigner to The Badger Company, Inc., a corporation of Massachusetts Filed Apr. 17, 1962, Ser. No. 188,196 12 Claims. (Cl. 159-47) This invention relates to separation of phthalic acid from maleic acid by fractional crystallization. `In the production of phthalic anhydride a substantial amount of maleic anhydride is also formed, usually from oxidation in gaseous `or liquid phase of hydrocarbons of the nature of naphthalene, o-xylene, alkyl naphthalenes and the like. The common methods of purication of the predominantly phthalic anhydride reaction product result in production of large quantities of aqueous solutions containing both phthalic acid and maleic acid which also may contain only small quantities of other organic acids, usually ...
... aims at providing comprehensive data on 3,4-methyl hexahydrophthalic
1. Bernstein, D.I., Patterson, R. et Zeiss, C.R., «Clinical and immunologic evaluation of trimellitic anhydride and phthalic anhydride exposed workers using a questionnaire with comparative analysis of enzyme-linked immunosorbent and radioimmunoassay studies.» Journal of Allergy and Clinical Immunology. Vol. 69, no. 3, p. 311-318. (1982). [AP-022699 ...
The bioassay data displayed in this panel includes modeled AC50 values from multi-concentration data only. Single concentration data may also be available for some assay technologies. Single concentration data are included in the list of tested assays endpoints if multi-concentration data are unavailable; this can be visualized by searching for a chemical, and clicking "All Tested" in the Assay pane in the Toxcast Dashboard. Raw, normalized, and interpreted single concentration data from level 0 to level 2 are fully available from the freely downloadable MySQL database, invitrodb. Internet Explorer may enable the best functionality to view the Toxcast Dashboard. The scaled response shown on the graph below is calculated by dividing the response values by the activity cutoff thereby enabling response comparisons across assay endpoints ...
RolleChim: Engineering company skilled on providing technology and critical equipment for phthalic anhydride process. Supply of switch condensers, fixed-bed reactors and turn-key plants for phthalic anhydride and maleic anhydride production.
6-[4-(2-fluorophenyl)piperazin-1-yl]-5-[[3-(2-methoxyethyl)-4-oxo-2-sulfanylidene-thiazolidin-5-ylidene]methyl]-4-methyl-2-oxo-1-propyl-pyridine-3-carbonitrile Carboxylic acids, di-, C9-15, polymers with diethylene glycol, pentaerythritol, phthalic anhydride and triethylene glycol 2,5-Furandione, polymers with bisphenol A, epichlorohydrin and hydrogenated butadiene-styrene polymer (1R-(1alpha,2beta,3alpha,5alpha))-(2-(1,3-Dithian-2-ylmethyl)-6,6-dimethylbicyclo(3.1.1)hept-3-yl-C,S)dihydroboron N-(2,4-difluorophenyl)-3-(4-methylphenyl)adamantane-1-carboxamide Arolycoricidine 8-(3-amino-4-methyl-phenyl)-7H-purin-6-amine (E)-3,4-dimethylhept-3-ene 1-[1-(7-bromo-9H-fluoren-2-yl)ethylideneamino]-2-methyl-guanidine 2-chloro-N-(1-phenylethyl)acetamide
Instructions for use: Roll gently between palms before use to warm product Apply 1-3 coats to achieve desired effect For a chip-free manicure, use with Deborah Lippmann [base coat 349324] and [top coat id349327] 15ml/0.50 fl.oz. Butyl Acetate, Ethyl Acetate, Nitrocellulose Acetyl Tributyl Citrate, Phthalic Anhydride/Trimellitic Anhydride/Glycols Copolymer,Isopropyl Alcohol, Stearalkonium Hectorite, Adipic Acid/FumaricAcid/Phthalic, Acid/Tricyclodecane Dimethanol Copolymer,Citric Acid, Biotin, Butylene Glycol(And)Water (And) Camellia Oleifera Leaf Extract,Aucoumea Klaineana Oleo-Resin Extract [ +/ ] (May Contain)Titanium Dioxide; C.I. 77891 D&C Red #6 Barium Lake; C.I. 15850, D&C Red #7 Calcium Lake; C.I. 15850:1, D&C Red #34 Calcium Lake; C.I. 15850:1, FD&C Yellow #5 Aluminum Lake; C.I. 19140, D&C Yellow #10 Aluminum Lake; C.I. 47005, D&C Blue #1 Aluminum Lake; C.I. 42090, Ferric Ammonium Ferrocyanide; C.I. 77510, Red Iron Oxide; C.I. 77491, Black Iron Oxide; C.I. 77499, Mica; C.I. 77019, Bismuth
Instructions for use: Roll gently between palms before use to warm the product Apply 1-3 coats to achieve desired effect For a chip-free manicure, use with [Deborah Lippmann base coat id349324] and [top coat id349327] 15ml/0.50 fl.oz. Ingredients: Butyl Acetate, Ethyl Acetate, Nitrocellulose Acetyl Tributyl Citrate, Phthalic Anhydride/Trimellitic Anhydride/Glycols Copolymer,Isopropyl Alcohol, Stearalkonium Hectorite,Adipic Acid/FumaricAcid/Phthalic, Acid/Tricyclodecane Dimethanol Copolymer,Citric Acid, Biotin, Butylene Glycol (And)Water (And) Camellia Oleifera Leaf Extract,Aucoumea Klaineana Oleo-Resin Extract, [ +/ ] (May Contain)Titanium Dioxide; C.I. 77891 D&C Red #6 Barium Lake; C.I. 15850, D&C Red #7 Calcium Lake; C.I. 15850:1, D&C Red #34 Calcium Lake; C.I. 15850:1, FD&C Yellow #5 Aluminum Lake; C.I. 19140, D&C Yellow #10 Aluminum Lake; C.I. 47005, D&C Blue #1 Aluminum Lake; C.I. 42090, Ferric Ammonium Ferrocyanide; C.I. 77510, Red Iron Oxide; C.I. 77491, Black Iron Oxide; C.I. 77499, Mica; C.I.
Ethyl Acetate, Butyl Acetate, Nitrocellulose, Propyl Acetate, Isopropyl Alcohol, Tributyl Citrate, Tosylamide/Epoxy Resin, Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer, Stearalkonium Hectorite, Acrylates Copolymer, Benzophenone-1, Hydrogenated Acetophenone/Oxymethylene Copolymer, Dimethicone, Aqua / Water, Silica, Phthalic Anhydride/Glycerin/Glycidyl Decanoate Copolymer, Synthetic Fluorphlogopite, Acetyl Tributyl Citrate, Citric Acid, Alcohol Denat., Calcium Aluminum Borosilicate, Magnesium Silicate, Alumina, Oxidized Polyethylene, Calcium Sodium Borosilicate, Calcium Pantothenate, Ferrous Gluconate, Tin Oxide, Silica [Nano] / Silica, Polyethylene Terephthalate, Acetone, CI 77002 / Aluminum Hydroxide, Polyurethane-11.. ...
Poly(ethylene terephthalate) (PET) from off-grades of industrial manufacturers was partially and thoroughly depolymerized in order to synthesize PET oligomers and bis(hydroxyethyl) terephthalate (BHET), respectively. Design of experiments and analysis of variance (ANOVA) were applied for optimization of samples. Effects of reaction time, volume of glycol, catalyst concentrations, and particle size of off-grade PET were investigated. The optimal conditions to synthesize PET oligomers (3-8 repeating units) were glycol/PET molar ratio of 1, a weight ratio (catalyst to PET) of 0.5 wt%, using granule-shape. On the other hand, a reaction time of 180 min, a weight ratio (catalyst to PET) of 0.25 wt%, and glycol/PET molar ratio of 5 were obtained as the suitable conditions of BHET production. Then, endcapped PET oligomers, as a compatibilizer for preparing PET nanocomposites, were produced via reaction between maleic anhydride/phthalic anhydride (MA/PhA) composition. The combination of reaction time of ...
EMSA was performed according to the manufacturers recommendations (Promega). Briefly, astrocytes were washed twice with 1×PBS, followed by the addition of 1 ml of PBS, and the cells were scraped into a cold Eppendorf tube. Cells were spun down at 15,000 rpm for 5 min, and the resulting supernatant was removed. Solution A (50 mM HEPES, pH 7.4, 10 mM KCl, 1 Mm EDTA, 1 mM EGTA, 1 mM dithiothreitol, 0.1 μg/ml PMSF, 1 μg/ml pepstatin A, 1 μg/ml leupeptin, 10 μg/ml soybean trypsin inhibitor, 10 μg/ml aprotinin, and 0.5% Nonidet P-40) was added to the pellet in a 2:1 ratio (v/v) and incubated on ice for 10 min. Solution C (solution Aþ 10% glycerol and 400 mM KCl) was added to the pellet in a 2:1 ratio (v/v) and vortexed on ice for 20 min. The cells were centrifuged at 15,000 g for seven minutes, and the resulting nuclear extract supernatant was collected in a chilled Eppendorf tube. The proteins of mice brains were extracted as the method in astrocytes. STAT3 (5′-GAT CCT TCT GGG AAT TCC TAG ...
Alkyd coatings are a class of polyester coatings derived from the reaction of an alcohol (alkohol) and an acid or acid anhydride hence the term alk-yd from "alcohol and acid or anhydride]" and are the dominant resin or "binder" in most "oil-based" coatings sold to the consumer market. Alkyd coatings today are typically manufactured from acid anhydrides such as phthalic anhydride or maleic anhydride and polyols such as glycerine or pentaerythritol and are modified with unsaturated fatty acids (from plant and vegetable oils) to give them air drying properties. The unsaturated oils react with oxygen from the air which cause the oils to polymerize or crosslink with each other. The drying speed of the coatings depends on the amount and type of drying oil employed (more unsaturated oil means faster reaction with oxygen from the air) and use of organic metal salts or "driers" which catalyze crosslinking between the unsaturated oils used to modify the base polyester resin. Traditionally organic lead ...
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A novel fluorine-containing telechelic polyimide end-capped with acetylene group which derived from 4,4-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 3,4-diaminodiphenyl ether (DADE), and 4-(2-phenylethynyl) phthalic anhydride (PEPA) was synthesized using polycondensation. The physical and CO2 permeation properties of its crosslinked membranes prepared by the cyclotrimerization reaction of the acetylene groups at the polymer chain end using tantalum (V) chloride (TaCl5) as a catalyst under thermal treatment was investigated in terms of CO2-induced membrane plasticization. The crosslinked membranes showed a gel content in organic solvent, which was good solvent of noncrosslinked membranes, and improved their thermal stability. Based on the measurement of the high-pressure time dependence on CO2 permeation, the crosslinked 6FDA-DADE-PEPA membranes exhibited more resistance to CO2-induced plasticization than noncrosslinked 6FDA-DADE and thermal treated 6FDA-DADE-PEPA. Furthermore, the ...
0040]56 g of soy bean oil and 40 g of trimethylol propane were transesterified at 260° C. using 0.01 g of lithium hydroxide as a catalyst. When a sample was completely soluble in ethanol forming a single phase, the mixture was cooled to 180° C., 91 g of phthalic anhydride, 47 g of trimethylol propane and 23 g of benzoic acid were added and esterification was continued at 230° C. until an acid number of 3 mg/g had been reached. Thereafter, 202 g of the grafted fatty acid of example 1 were added at 160° C., and the mixture was heated to 175° C. At this temperature, esterification was continued until an acid number of 62 mg/g had been reached, the water formed being removed by azeotropic distillation with xylene. All residual solvent was then removed by distillation under reduced pressure. Within thirty minutes, 36 g of isophorone diisocyanate were added at 70° C., the temperature slowly rising due to the exothermic reaction to 100° C. At this temperature, the reaction was continued as in ...
Chemicals - Phthalic Anhydride China, Testosterone Undecanoate Formula 65306, Testosterone undecanoate Molecular Formula: C30H48O3 Formula Weight: 456.7 CAS:5949-44-0 Appearance white fine powder Pa...
The breakthrough, published in Nature Chemistry, came when the team fed agas mixture of decane and air through an iron molybdate catalyst. At higher temperatures, the reaction formed water and decene, which is used in the production of detergents. At lower temperatures, however, the reaction took a different route to create oxygenated aromatic molecules. These included phthalic anhydride, used in the dyeing industry, and coumarin which helps in the production of anti-coagulant drugs. ...
phthalein definition: some of a team of compounds formed by a reaction of phthalic anhydride with a phenol, that certain artificial dyes are derived.; any one of a variety of lactones created because…
In 2001, Proviron took over Sisas phthalic anhydride activities in Ostend. The company also took over the sites central services, which previously were operated by BASF. With this, Proviron acquired the whole Ostend site with the exception of the Huber activities. By the end of the year, the company employed about 350 people in total. ...
A phthalylated ion-exchange biopolymer was obtained by adding cellulose to molten phthalic anhydride in a quasi solvent-free procedure. Through this route 2.99 +/- 0.07 mmol g(-1) of pendant groups containing ester and carboxylic acid moieties were incorporated into the polymeric structure that was characterized by elemental analysis, solid-state carbon nuclear magnetic resonance (CP/MAS), infrared spectroscopy, X-ray diffraction, and thermogravimetry. The chemically modified polysaccharide is able to exchange cations from aqueous solution as demonstrated by batchwise methodology. The data were adjusted to a modified Langmuir equation to give 2.43 +/- 0.12 and 2.26 +/- 0.11 mmol g(-1) for divalent cobalt and nickel cations, respectively. The net thermal effects obtained from calorimetric titration measurements were also adjusted to a modified Langmuir equation, and the enthalpy of the interaction was calculated to give endothermic values of 2.11 +/- 0.28 and 2.50 +/- 0.31 kJ mol(-1) for these ...
Dr. Jonathan A. Bernstein is Professor of Clinical Medicine in the Department of Internal Medicine, Division of Immunology/Allergy Section at the University of Cincinnati Medical Center and partner of the Bernstein Allergy Group and Clinical Research Center. He received his MD from the University Of Cincinnati College Of Medicine in 1985. He completed his residency training in Internal Medicine at the Cleveland Clinic Hospital from 1985-1988 and his Allergy/Clinical Immunology training at Northwestern University from 1988-1990. His current research involves the health effects of environmental interventions in the homes of asthmatic children funded by NIAID, novel therapies for the treatment of angioedema/chronic urticaria, biomarkers and mechanisms of HAE, immunosurveillance for Trimellitic anhydride sensitization in the workplace, food and drug hypersensitivity, allergenicity of cyanobacteria, phenotyping/endotyping chronic rhinitis subtypes specifically non-allergic rhinitis and seminal plasma ...
ISOPROPYL ALCOHOL, NITROCELLULOSE, ADIPIC ACID / NEOPENTYL GLYCOL / TRIMELLITIC ANHYDRIDE COPOLYMER, TRIMETHYL PENTANYL DIISOBUTYRATE, C12‑15 ALKANE / CYCLOALKANE / AROMATIC HYDROCARBONS, HYDROGENATED TRIPHENYL PHOSPHATE, STEARALKONIUM HECTORITE, DIACETONE ALCOHOL, C6‑20 POLYOLEFIN, POLYBUTENE, HYDRATED SILICA, 1,3‑BENZENEDICARBOX‑ BENZOPHENONE‑1, CITRIC ACID, DIMETHICONE. MAY CONTAIN (±): RED 6 LAKE YLIC ACID, POLYMER WITH 1,4‑BENZENEDICARBOXYLIC ACID, 2,2‑DIMETHYL‑1,3‑ (CI 15850), RED 7 LAKE (CI 15850), IRON OXIDES (CI 77491), TITANIUM DIOXIDE PROPANEDIOL, 1,2‑ETHANEDIOL AND HEXANEDIOIC ACID/ACIDE BENZÈNE‑1,3‑ DICARBOXYLIQUE POLYMÉRISÉ AVEC LACIDE BENZÈNE‑1,4‑DICARBOXYLIQUE, LE 2,2‑DIMÉTHYLPROPANE‑1,3‑DIOL, LÉTHANE‑1.2‑DIOL ET LACIDE HEXANEDIOÏQUE ...
Benefits:. Natios Nail Colour collection features timeless, on-trend and even metallic shades. Easily and affordably update your look with a colour that reflects your individual style.. Start with a layer of Natio Top and Base Coat to protect nails and guard against staining. When dry, apply two thin layers of Nail Colour (rather than one thick layer), ensuring the first coat is completely dry before applying the second. This deepens the nail polish colour.. Ingredients:. Ethyl Acetate, Butyl Acetate , SD Alcohol 40B, Nitrocellulose, Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer, Isopropyl Alcohol, Triphenyl Phosphate, Trimethyl Pentanyl Diisobutyrate, Sucrose Benzoate, Camphor, Acrylates Copolymer, Etocrylene, Dimethicone, CI 60725 Violet 2.. ...
Although there is no evidence that the enzyme(s) in this preparation induces specific respiratoryhypersensitivity, all proteins are potential respiratory allergens and may result in respiratorysensitization in certain individuals after repeated and/or prolonged inhalation exposure, producingmild to severe symptoms similar to pollen allergy or asthma, including mucous membrane or eyeirritation, itching of the skin or eyes, sneezing, nasal or sinus congestion, coughing, and tightnessin the chest. These symptoms may develop as late as 12 hours after exposure ...
Chemical allergens bind directly, or after metabolic or abiotic activation, to endogenous proteins to become allergenic. Assessment of this initial binding has been suggested as a target for development of assays to screen chemicals for their allergenic potential. Recently we reported a nitrobenzenethiol (NBT) based method for screening thiol reactive skin sensitizers, however, amine selective sensitizers are not detected by this assay. In the present study we describe an amine (pyridoxylamine (PDA)) based kinetic assay to complement the NBT assay for identification of amine-selective and non-selective skin sensitizers. UV-Vis spectrophotometry and fluorescence were used to measure PDA reactivity for 57 chemicals including anhydrides, aldehydes, and quinones where reaction rates ranged from 116 to 6.2 × 10(-6) M(-1) s(-1) for extreme to weak sensitizers, respectively. No reactivity towards PDA was observed with the thiol-selective sensitizers, non-sensitizers and prohaptens. The PDA rate ...
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Open peer review is a system where authors know who the reviewers are, and the reviewers know who the authors are. If the manuscript is accepted, the named reviewer reports are published alongside the article. Pre-publication versions of the article and author comments to reviewers are available by contacting [email protected] All previous versions of the manuscript and all author responses to the reviewers are also available.. You can find further information about the peer review system here.. ...
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... from water. The published solubility of phthalic acid in 100 mL of water is 0.54 g at 14ºC and 18 g at 99ºC. What is the smallest volume (in milliliters) of boiling water the student could use to dissolve the 3.88 g sample of phthalic acid? (Report your answer to 3 significant figures.) ...
Paula Begoun is the best-selling author of 20 books about skincare and makeup. She is known worldwide as The Cosmetics Cop and creator of Paulas Choice Skincare. Paulas expertise has led to hundreds of appearances on national and international radio, print, and television including:. ...
TY - JOUR. T1 - Effect of butylidenephthalide on calcium mobilization in isolated rat aorta. AU - Ko, Wun-Chang. AU - Charng, Chuan Y.. AU - Sheu, Joen Rong. AU - Tzeng, Shu-Huey. AU - Chen, Chi Ming. PY - 1998/12. Y1 - 1998/12. N2 - Butylidenephthalide (Bdph), an antispasmodic compound originally isolated from the rhizome of Ligusticum chuaxiong, has a selective anti-anginal effect without changing blood pressure. Experiments have been performed to determine the mechanism of this action. Synthetic Z-butylidenephthalide concentration-dependently relaxed phenylephrine (1 μM)- or KCl (60 mM)-induced precontractions of intact and denuded rat aorta rings. The relaxation induced by Bdph was endothelium-independent. Bdph (30-300 μM) concentration-dependently reduced cumulative phenylephrine- and KCl-induced contractions of intact rat aortic rings and non-competitively inhibited their log concentration-response curves. The pD2 values of Bdph for phenylephrine- and KCl-induced contraction were 3.66 ...
Source. Epoxy and resin are two similar materials that are often used interchangeably. Epoxy resins are polyepoxides that are reactive polymers and prepolymers. Different types of epoxy resins are Bisphenol-based epoxy resins and curing epoxy resins. Bisphenol-based epoxy resins are most used resin types across the globe. On the other hand, curing epoxy resins are the less used on an industrial level due to their poor mechanical properties, poor heat bearing properties, and not so good chemical properties. Different types of epoxy resins are now being used in various commercial and non-commercial applications such as construction, and decorative uses. Epoxy resins inherently have excellent adhesive and coating properties that make it a preferred choice over standard adhesives. Apart from being used as adhesives, epoxy resins are used in paints, primers, flooring, sealers, and coatings in product manufacturing and/or construction.. The global epoxy resin market is huge and it is growing with a ...
0159] Step 1: In an oven-dried, nitrogen-flushed 250 ml 3-neck round bottom flask, fitted with Dean-Stark trap, condenser, magnetic stir bar, and nitrogen inlet, was placed 15.0 g (0.078 moles) trimellitic anhydride, 9.68 g (0.039 moles) 4,4-diaminodiphenylsulfone (DDS), and 50 ml dimethylacetamide (DMAc). The mixture was stirred and warmed to 60° C. for 20 minutes to give a clear yellow solution, Next, 25 ml toluene was added and the reaction mixture warmed using an oil bath controlled at 165° C. for three hours while collecting the distillate. The trap was drained and the contents heated for another 30 minutes using an oil bath at 165° C. to remove residual toluene. The mixture was cooled to room temperature and a solid precipitated from the solution. The solid was isolated by filtration, washed several times with methanol and then dried for four hours in a vacuum oven. IR analysis of the solid showed absorptions indicating the presence of imide carbonyls, sulfonyl, and carboxyl OH. [0160] ...
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