• Molar mass distribution measurements are performed by SEC-MALLS-RI, i.e. size-exclusion chromatography (SEC) with multi-angle laser light scattering (MALLS) / refractive index (RI) detection, in the solvent system N,N -dimethylacetamide (DMAc)/LiCl. (boku.ac.at)
  • In size exclusion chromatography, the stationary phase is. (web.app)
  • NOTE Also known as size exclusion chromatography (SEC). (iso.org)
  • In this approach, the existence of surface adsorption and enthalpic partition as two similar but distinct enthalpic retention mechanisms in high-performance liquid chromatography of polymers was indirectly demonstrated. (tsijournals.com)
  • Expensive ion pair reagents are not required in HILIC, and it can be conveniently coupled to mass spectrometry (MS), especially in the electrospray ionization (ESI) mode. (springer.com)
  • While direct measurements with inductively coupled plasma-mass spectrometry (ICP-MS) are highly efficient and feasible, only total Gd can be detected with this approach. (univie.ac.at)
  • Two-dimensional gel electrophoresis in conjunction with liquid chromatography mass spectrometry analysis was utilized to identify accumbal protein candidates involved in the retrieval of cocaine-induced CPP. (tmu.edu.tw)
  • When absolute confidence in compound identity is required, mass spectrometry (GC/MS) is the method of choice. (cdc.gov)
  • DMA can recognize small transition regions that are beyond the resolution of DSC (Differential Scanning Calorimetry).Applicable to polymers and polymeric biomaterials. (sctimst.ac.in)
  • For extremely low-molar-mass examples, the adsorption might be adequately frail and desorption at correctly the indistinguishable portable stage synthesis may happen. (tropicalnaturetravel.com)
  • The entropy controlled retention mechanism is paired with the interaction retention mechanisms to simultaneously identify two molecular features of a complex polymer such as copolymers or polymer blends Adsorption, or the distribution of a solute between a solid surface and a volume of its solution in a mobile phase, is the most prevalent interaction retention mechanism used in linked LC procedures. (tsijournals.com)
  • PMMA surface adsorption on free silanols was inhibited by ACN, which encouraged enthalpic partitioning of polymer species in favour of a solvated C-18 bonded phase. (tsijournals.com)
  • Adsorption and enthalpic partition often function in concert, either synergistically or antagonistically, and this can have a significant impact on polymer separation selectivity. (tsijournals.com)
  • A new adsorbent based on aptamer functionalized magnetic hydrophobic polymer (MHbPA) was developed for specific and efficient adsorption of alternariol (AOH). (bvsalud.org)
  • Through the synergistic effect of aptamer-AOH affinity and hydrophobic interaction of polymer, enhanced adsorption properties had been realized, in which AOH aptamer was the first selected through capture-SELEX with good specificity and affinity, and the targeting polymer was designed based on the hydrophobicity of AOH to increase the interaction. (bvsalud.org)
  • Despite good solubility in the mobile phase and even though the chromatograms obtained show good repeatability, it is possible that this method cannot be used with certain polymer types because of specific interactions (e.g. adsorption) within the sample/eluent/column system (see also Clause 12). (iso.org)
  • The two materials most widely used for adsorption and thermal desorption of volatile organic compounds collected by the purge and trap technique are Carbotrap®, consisting of graphitized carbon black, and Tenax®, a porous polymer of 2,6-diphenyl-p-phenylene oxide (Fabbri et al. (cdc.gov)
  • Composed of semipermeable, porous polymer gel beads with well defined range of pore sizes. (web.app)
  • The analytical column contains aminophenylboronic acid bonded to a porous polymer support (gel). (cdc.gov)
  • We provide the scientific community with state-of-the-art microanalytic capabilities, including microscopy, chromatography, spectroscopy and structural analysis. (xerox.com)
  • U.S. Patent 5,391,629 describes thermoplastic elastomer compounds comprising tapered and block linear polymers from ethylene and alpha-olefin monomers. (allindianpatents.com)
  • Study of DMTA analysis showed that chemical modification of 4-chloromethyl styrene copolymers with phthalimide substituent leads to an increase in the rigidity and glass transition temperature of polymers. (ac.ir)
  • The best commercially known class of TPE polymers are the styrenic block copolymers (SBC), typically linear triblock polymers such as styrene-isoprene-styrene and styrene-butadiene-styrene, the latter of which when hydrogenated become essentially styrene-(ethylene-butene)-styrene block copolymers. (allindianpatents.com)
  • In normal phase liquid chromatography (NP-LC), the stationary phase is more polar than the mobile phase. (springer.com)
  • Bare silica gel is an acceptable stationary phase. (tsijournals.com)
  • The chemical attachment of suitable groups, usually C18 alkyl groups, onto a carrier, primarily silica gel, produces the practically applicable volume of LC stationary phase. (tsijournals.com)
  • Liquid chromatography (LC) technologies currently provide the most relevant information on both average values and distributions of molecular characteristics? (tsijournals.com)
  • Among the nanoplatforms designed to address these objectives, polymer-based NPs have attracted much interest mainly because of the versatile characteristics of polymers allowing adjustment of the physico-chemical and biological properties of the corresponding nanocarriers. (frontiersin.org)
  • Thus useful TPE polymers from olefinically unsaturated monomers, such as ethylene and C3-C8 α-olefms, have been developed and are also well-known. (allindianpatents.com)
  • To act as a cross-roads where University research and education meet with Industry and Government partners in Polymer Materials, Engineering and Processing at the University of Massachusetts-Amherst to leverage resources and foster partnerships that lead to lasting value collaborations. (umass.edu)
  • The Center for UMass / Industry Research on Polymers (CUMIRP) is a Center which promotes and coordinates polymer research collaborations between the University of Massachusetts-Amherst and Industry / Government. (umass.edu)
  • CUMIRP works with all Departments involved with polymers at UMass Amherst, and also serves as a link to other polymer programs beyond our campus. (umass.edu)
  • As is true for most volatile organic compounds, the preferred analytical technique for dibromochloro methane and bromoform is gas chromatography (GC) (Ashley et al. (cdc.gov)
  • If the respective molecular weight averages of the analyzed sample and of the calibration standard differ considerably, the effective linear calibration method leads to serious systematic errors in the calculated average molar mass values. (cas.cz)
  • If absolute molar mass values are required, an absolute method (e.g. membrane osmometry for M n or light scattering for M w ) can be used. (iso.org)
  • Shimpack gpc 80m mixed gel columns 80mc, 80md mixed gel columns that produce linear calibration curves over a wide range of molecular weights. (web.app)
  • Using calibration standards, the relative molecular weights in the polymer sample can be determined. (vonroll.com)
  • The ratio M w /M n calculated using ELC form an uncorrected chromatogram is always smaller than that determined by means of the true calibration dependence, but the extent of this correction for longitudinal spreading depends on the polydispersity of both the original calibration standard and the analyzed polymer, and also on the separation efficiency of the given column. (cas.cz)
  • The conditions specified in this document are not applicable to the GPC analysis of polymer samples with M w values greater than 10 6 g/mol and/or polymers with elution limits outside the calibration range (see 7.6 and Annex C). (iso.org)
  • The kits include a calibration report and quality certificates with analytical parameters and molar mass information for every single standard. (omegascientific.com.sg)
  • Most common are ultraviolet-visible, fluorescence, and mass spectrometric detectors. (cbrnetechindex.com)
  • GPC is often used to determine the relative molecular weight of polymer samples as well as the distribution of molecular weights. (sctimst.ac.in)
  • Regularly, silica gel is utilized as the fixed stage. (tropicalnaturetravel.com)
  • At 35 °C, two separate liquid chromatographic critical ranges were discovered using non-end-capped silica gel C-18 column packing, poly (methyl methacrylate)s (PMMAs), and mixed eluents including acetonitrile (ACN) and toluene. (tsijournals.com)
  • Lignin is a group of cell wall localised heterophenolic polymers varying in the chemistry of the aromatic and aliphatic parts of its units. (bvsalud.org)
  • To precisely determine changes in lignin composition, we, herein, describe the various methods to detect and quantify the levels and positions of G aldehyde units, also called coniferaldehyde residues, of lignin polymers in ground plant samples as well as in situ in histological cross-sections. (bvsalud.org)
  • This method is applicable to neutral polymers and polyanions (e.g. polycarboxylates, polysaccharides, fully hydrolyzed polyvinyl alcohols and high-molecular polyethylene oxides). (iso.org)
  • There are presently 30+ industrial members and CUMIRP is multidisciplinary: at the interface of Polymers, Biology, Biochemistry, Chemistry, Chemical Engineering, Food Science, Mechanical Engineering and Physics. (umass.edu)
  • Journal of Polymer Science, Part A: Polymer Chemistry , 43 (13), 2765-2776. (tue.nl)
  • It is the adaptability of paper chromatography in its numerous varieties that is behind its inescapable remaining in division science, combined with simplicity of approach and a sensibly all around created outline in which the different chromatographic procedures work. (tropicalnaturetravel.com)
  • Determination of branching and conformation of polymers. (synpo.cz)
  • Here we show that a simple aldol condensation reaction can prepare polymers where double bonds lock-in a rigid backbone conformation, thus eliminating free rotation along the conjugated backbone. (nature.com)
  • For transistor applications, polymer molecular conformation and thin film morphology have been shown to influence charge carrier mobility, and subsequently the device electrical properties 3 . (nature.com)
  • abstract = "For any polymer the determination of the average molecular weight and its distribution is an important part of characterising its physical properties. (edu.sa)
  • Chapter 3, Reinventing the I/UCRC Model, tells the story of the Center for University of Massachusetts/Industry Research on Polymers (CUMIRP) and how it developed a hybrid center model. (umass.edu)
  • Conventional semiconducting polymer synthesis typically involves transition metal-mediated coupling reactions that link aromatic units with single bonds along the backbone. (nature.com)
  • 5] Nishikubo T., Kondo T., Inomata K., Study of Polymeric Photosensitizers Synthesis of Multifunctional Photosensitizers Bonded on Cross-Linked Polymer Beads and Their Application for Photoisomerization of Potassium Sorbate, Macromolecules , 22 , p.3827 (1989). (ac.ir)
  • Here we report an aldol polymerisation scheme that circumvents cross coupling and links repeat units with carbon−carbon double bonds, in contrast to the single bond links in all conjugated polymer backbones prepared in the literature to date. (nature.com)
  • The present invention relates to elastomeric propylene polymers incorporating macromers and a method for the preparation of branched polymers having atactic polypropylene backbones and isotactic or syndiotactic polypropylene sidechains utilizing transition metal catalyst compounds. (allindianpatents.com)
  • The similarities and differences of two-dimensional liquid chromatography of low-molecular-mass and polymeric compounds are discussed. (tsijournals.com)
  • Our polymers with a high electron affinity display long wavelength NIR absorption with air stable electron transport in solution processed organic thin film transistors. (nature.com)
  • In the Material Development group, we work with the abundance of polymers available on the market, with functional fillers and reinforcing materials, as well as with the whole variety of additives, in order to create compounds from them that are as universal or customised as possible, depending on the requirements. (skz.de)
  • The development of π-conjugated polymer dots having a bright emission band at visible can be a promising probe for the detection of food color additives. (bvsalud.org)
  • In this method, the polymer molecules are separated based on their hydrodynamic volume. (vonroll.com)
  • It is capable of detecting analytes ranging in size from ions to large polymers and biological molecules including proteins. (cbrnetechindex.com)
  • text{strong}} \atop {\text{acid}}][-CH2CH2CH2CH2O-]_{\mathit {n}}}}} This polymer is primarily used to make elastomeric polyurethane fibers like Spandex. (wikipedia.org)
  • Simutaneously high open circuit voltage and high short circuit current density is a big challenge for achieving high efficiency polymer solar cells due to the excitonic nature of organic semdonductors. (nature.com)
  • Herein, we design and synthesize a novel all-carbon supramolecular polymer host ( SPh ) containing conjugated macrocycles interconnected by a linear poly( para -phenylene) backbone. (rsc.org)
  • The analysis of these results, in terms of a statistical-mechanical model that incorporates polymer flexibility as well as the excluded volume of the protein, shows that the dramatic enhancement of bovine pancreatic trypsin inhibitor self-association can be quantitatively rationalized in terms of hard repulsive interactions. (lu.se)
  • Gel permeationsize exclusion chromatography 5 chapter 2 gpcsec overview 6 polymers 6 size matters 6 how does gpcsec work 7 who uses gpcsec, what for and why 8 calibrations 8. (web.app)
  • Hydrophilic interaction liquid chromatography (HILIC) provides an alternative approach to effectively separate small polar compounds on polar stationary phases. (springer.com)
  • NP-LC has been widely used to separate various compounds, from nonpolar to highly polar compounds (note that chromatography was first introduced as a method used in separation science). (springer.com)
  • For example, it is suitable for analyzing compounds in complex systems that always elute near the void in reserved-phase chromatography. (springer.com)
  • Hydrophilic interaction liquid chromatography has established itself as the separation mode of choice for uncharged highly hydrophilic and amphiphilic compounds that are too polar to be well retained in RP-LC but have insufficient charge to allow effective electrostatic retention in ion-exchange chromatography. (springer.com)
  • Electron transport is attributed to the combination of a delocalised LUMO level along the polymer backbone, and a sufficiently large electron affinity to facilitate electron injection. (nature.com)
  • Therefore, a design strategy that only incorporates electron-deficient repeat units into the polymer backbone is desirable 14 . (nature.com)
  • A thermoplastic elastomer is provided comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone wherein at least 90 mole percent of the sidechains are isotactic or syndiotactic polypropylene and at least 80 mole percent of the backbone is atactic polypropylene. (allindianpatents.com)
  • We analyze the effects of polymer concentration, C p , and physical crosslinking ratio, r c , on the linear viscoelasticity of lightly entangled, linear, associating polymers with multiple crosslinkable groups along the chain backbone. (aip.org)
  • Low molecular mass heparins are salts of sulphated glucosaminoglycans having a mass average molecular mass less than 8000. (chromatographyonline.com)
  • TGA is effective for quantitative analysis of thermal reactions that areaccompanied by mass changes, such as evaporation, decomposition, gas absorption,desorption and dehydration. (sctimst.ac.in)
  • Synthetic macromolecules have a molar mass, a chemical structure (composition), and a physical architecture (topology). (tsijournals.com)
  • Three constituents make up a complicated polymer system, each with its own composition and molar mass distribution. (tsijournals.com)