• Possible exposure to a melamine/formaldehyde resin existed when the lace was passed through this mixture to provide durability and body. (cdc.gov)
  • Melamine-formaldehyde condensate is used for preferential filling. (clri.org)
  • It is made from sulfonated melamine formaldehyde. (cabr-concrete.com)
  • Write the structure of the monomer used for getting the melamine-formaldehyde polymer. (psebsolutions.com)
  • This will often result in the formation of small cracks as the water eventually evaporates over time, red What is Water reducing agent?Water reducers developed over the years can be categorized as lignosulfonates, hydroxycarboxylic acids, hydroxylated polymers, salts of melamine formaldehyde sulfonates, or naphthalene formaldehyde sulfonic acids. (mis-asia.com)
  • In polymer chemistry , polymerization ( American English ), or polymerisation ( British English ), is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks. (wikipedia.org)
  • In step-growth (or step) polymerization, pairs of reactants, of any lengths, combine at each step to form a longer polymer molecule. (wikipedia.org)
  • Modification of collagen hydrolysate with natural polymer as retanning agent through simple polymerisation. (clri.org)
  • They used a urea-formaldehyde polymerization to induce aggregation of the particles in a SnO 2 sol and encapsulate them in the polymer (a so-called polymerization-induced-colloid-aggregation process). (chemistryviews.org)
  • wherein the aqueous based adhesive is comprised of a vinyl acetate/ethylene polymer formed by emulsion polymerization and having (a) a crystalline melting point (Tm) ranging from 35 to 110° C., preferably 50 to 90° C. (justia.com)
  • This tissue is then contacted with a second monomer under polymerization conditions such that a tissue-bonded polymer is formed in situ. (justia.com)
  • Its polymerisation gives melamine polymer. (psebsolutions.com)
  • Their condensed polymerisation gives melamine polymer. (esaral.com)
  • Leather industry consumes huge amount of synthetic phenol-formaldehyde resin as a re-tanning agent to improve the homogeneity and organoleptic properties of leather. (clri.org)
  • Replacement for phenol and formaldehyde type syntan. (clri.org)
  • The product is made of phenol, formaldehyde, sulfonating agent and other raw materials by multiple polymerization and sulfonation under certain conditions. (berkeleypartnersllp.com)
  • They are formed by reacting a phenol or bisphenol-A with formaldehyde and an aromatic amine and are cured by thermal ring-opening polymerization. (axiommrc.com)
  • Additionally, the aqueous solution needed to be heated at 60 °C to eliminate the polymerization. (uaeu.ac.ae)
  • The exhausted formaldehyde by volatilization was replaced by a continuous supply of aqueous diluted formaldehyde solution to keep the volume and mass of the aqueous solution and formaldehyde constant, respectively. (uaeu.ac.ae)
  • Pears were treated briefly in an aqueous solution containing stannous (Sn) ion, hydrochloric acid, formaldehyde, and tannic acid prior to steaming and canning processes. (sykinhibitors.com)
  • An example of alkene polymerization , in which each styrene monomer's double bond reforms as a single bond plus a bond to another styrene monomer. (wikipedia.org)
  • In chain-growth (or chain) polymerization, the only chain-extension reaction step is the addition of a monomer to a growing chain with an active center such as a free radical , cation , or anion . (wikipedia.org)
  • One embodiment of this method involves covalently bonding to the tissue a monomer capable of further polymerization. (justia.com)
  • However, achieving stable gaseous influent concentrations of formaldehyde was challenging since it polymerizes while volatilizing. (uaeu.ac.ae)
  • The author recommends improvement in the ventilation system, use of a resin system which contains less formaldehyde, use of respirators for workers operating the thread drawing and spooling machines, issuance of protective clothing, and the option of reassignment for particularly sensitive employees. (cdc.gov)
  • MF Resin is a polymerisation of melamine and formaldehyde. (biqem.com)
  • [3] Generally, because formaldehyde is an exceptionally reactive electrophile it allows nucleophilic addition of hemiacetal intermediates, which are in general short-lived and relatively unstable "mid-stage" compounds that react with other non-polar molecules present to form more stable polymeric compounds. (wikipedia.org)
  • These polymerized formaldehyde molecules dissolve fast in water and chemically react to generate methylene hydrate, with degrees of polymerization ranging from 8 to 100. (prsync.com)
  • The Use of formaldehyde condensate based mineral syntan in leather processing is not environmentally benign. (clri.org)
  • Combination of formaldehyde free melamine condensate and chromium melamine based syntans not available. (clri.org)
  • The precise molecular geometry of gaseous formaldehyde has been determined by gas electron diffraction and microwave spectroscopy. (wikipedia.org)
  • An environmentally benign post-polymerization functionalization strategy towards unprecedented poly(vinylamine) polyHIPEs. (ki.si)
  • Formaldehyde is an intermediate in the oxidation (or combustion) of methane, as well as of other carbon compounds, e.g. in forest fires, automobile exhaust, and tobacco smoke. (wikipedia.org)
  • Melamine and formaldehyde are starting materials for this intermediate. (psebsolutions.com)
  • Unstable reagents may undergo changes such as disproportionation polymerization, decomposition or precipitation after long-term storage. (todayprnews.com)
  • Formaldehyde (/fɔːrˈmældɪhaɪd/ for-MAL-di-hide, US also /fər-/ fər-) (systematic name methanal) is an organic compound with the formula CH2O and structure H−CHO. (wikipedia.org)
  • Formaldehyde is a naturally occurring chemical compound with the formula CH2O(HCHO). (prsync.com)
  • Information regarding the chemical identity of formaldehyde is located in Table 3-1. (cdc.gov)
  • In chemical compounds , polymerization can occur via a variety of reaction mechanisms that vary in complexity due to the functional groups present in the reactants [3] and their inherent steric effects . (wikipedia.org)
  • Furan resins are formed from the polymerization or poly condensation of furfural, furfural alcohol, or other compounds containing a furan ring. (globalspec.com)
  • Polyurea resins or binders are used in place of phenolics or other formaldehyde resins in particle or fiberboard binder applications. (globalspec.com)
  • Methanediol, the predominant species in dilute aqueous solutions of formaldehyde Molecular formaldehyde contains a central carbon atom with a double bond to the oxygen atom and a single bond to each hydrogen atom. (wikipedia.org)
  • Formed by the polymerisation of tetrafluoroethene in presence of free radical or persulphate catalyst at high pressure. (aplustopper.com)
  • Al-Faliti, M , Hassan, AA & Dvorak, B 2021, ' Generating a stream with a stable formaldehyde concentration in the laboratory ', Proceedings of International Structural Engineering and Construction , vol. 8, no. 1, pp. (uaeu.ac.ae)
  • Formaldehyde does not accumulate in the environment, because it is broken down within a few hours by sunlight or by bacteria present in soil or water. (wikipedia.org)
  • Formed by the addition polymerisation of acrylonitrile in presence of peroxide catalyst. (aplustopper.com)
  • Diborane is used in rocket propellants, as a reducing agent, as a rubber vulcanizer, as a catalyst for hydrocarbon polymerization, as a flame-speed accelerator, and as a doping agent. (cdc.gov)
  • Polymerization capacity see more of the solution was influenced by the composition, setting-time, and the time of Sn addition into the formulated solutions. (sykinhibitors.com)
  • Based on visual examination of the samples and a review of the ingredients used to make the dipping solution, the solution used to treat the three fabrics is effectively a variety of resorcinol formaldehyde latex (RFL). (faqs.org)
  • To solve this problem, sodium hydroxide (NaOH) was added with a phosphate buffer to the aqueous formaldehyde solution to maintain the pH between 7.00-7.20. (uaeu.ac.ae)
  • Formaldehyde and its adducts are ubiquitous in living organisms because they are produced naturally. (wikipedia.org)
  • Ten of 17 air samples tested for formaldehyde (50000) were above 0.1 part per million (ppm) levels and the total and respirable dust levels were between 0.1 and 0.2mg/m3. (cdc.gov)
  • formaldehyde levels above 0.1ppm may have increase the irritative effects of dust exposures. (cdc.gov)
  • of red anthocyanins on the surface of thermally processed red pears (D'Anjou) through complexation with metallic ions and polymerization was investigated. (sykinhibitors.com)
  • A new software has been developed for the simulation, design, parameter and state estimation, optimization, and control of specific polymerization processes aiming at increasing plant efficiency, improving product quality, and reducing the impact to environment. (colan.org)
  • Keeping in mind the strictures on presence of free formaldehyde and the advantages that a melamine based product in association with chromium, could offer, this product- Chromium-Melamine Syntan (CrMS) has been developed. (clri.org)
  • While neither legally binding nor dispositive, the EN provide a commentary on the scope of each heading of the HTSUSA and are generally indicative of the proper interpretation of these headings. (faqs.org)
  • A laboratory-scale bio-trickling filter (BTF) was initialized to evaluate the removal of formaldehyde biologically. (uaeu.ac.ae)
  • Polymerization capacity of the treatment solutions was investigated by monitoring the haze formation of the solutions. (sykinhibitors.com)
  • Formaldehyde is more complicated than many simple carbon compounds in that it adopts several diverse forms. (wikipedia.org)
  • The presence of free formaldehyde in leather and leather products, even at low ppm is becoming a huge cause of concern for leather manufactures. (clri.org)
  • Hence, the development of phenolic re-tanning agent devoid of formaldehyde is emerging. (clri.org)
  • Noxol® WSW is an antifouling agent particularly suited for protection of internal walls of reactors used for suspension polymerization of PVC. (nouryon.com)
  • Light yellow transparent antifouling agent particularly suited for protection of internal walls of reactors used for suspension polymerization of PVC. (nouryon.com)