Glass transition temperature chromatography

Solution Polymers. Acryflc solution polymers are usually characterized by their composition, solids content, viscosity, molecular weight, glass-transition temperature, and solvent. The compositions of acryflc polymers are most readily determined by physicochemical methods such as spectroscopy, pyrolytic gas—liquid chromatography, and refractive index measurements (97,158). The solids content of acryflc polymers is determined by dilution followed by solvent evaporation to constant weight. Viscosities are most conveniently determined with a Brookfield viscometer, molecular weight by intrinsic viscosity (158), and glass-transition temperature by calorimetry. 

Gellation catalysts, 224, 227-236 Gel permeation chromatography (GPC), 385-386, 490 Gels, urethane, 205 Glass-fiber-filled polyamides, 136 Glass transition temperature (7)), 3, 266, 267... 

Size-exclusion chromatography (SEC) has been also used as complementary technique for characterizing changes in the composition of synthetic resins due to aging. In particular, it enables the determination of molecular weight distributions and the glass transition temperatures of resins. 

Molecular weight was determined using gel permeation chromatography (GPC, Waters Millipore). The glass transition temperatures (7g) were analysed using differential scanning calorimetry (Perkin-Elmer DSC-2). 

Tyagi, O. S. Deshpande, D. D., "Inverse Gas Chromatography of Poly(n-butyl methacrylate) Effect of Flow Rate on Specific Retention Volume and Detection of Glass Transition Temperature," 34, 2377 (1987). 

SANS Small angle neutron scattering SEC Size exclusion chromatography STM Scanning timneling microscopy Tg Glass transition temperature... 

Other successful determinations of glass transition temperatures by inverse gas chromatography indude those of Perrault et al. 22) on poly(butadiene), Nakamura et al 26) on cellulose triacetate and Cahigaru et id. 27) on poly(viiq l acetate). 

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