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Viscoelasticity of melts of polydisperse polymers

โœ Scribed by A. Ya. Malkin; O. Yu. Sabsai; G. Zh. Zhangereeva; M. P. Zabugina; G. V. Vinogradov

Publisher
Springer US
Year
1978
Tongue
English
Weight
481 KB
Volume
13
Category
Article
ISSN
1573-8922

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The melt viscosity (,Ta) is calculated for polydisperse branched polymers by two methods: (1) by extending Graessley's theory of melt flow of polydisperse linear chains to include the effects of branching, and (2) by empirical deduction leading to the relation (~TB;'/('/L)= [(Ss:)w/ (SL2)~,] w2 for

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Dynamic properties in the melt state for two saturated hydrocarbon polymers, poly(ethylene-alt-propylene) (PEP) and head-to-head polypropylene (HHPP), were investigated by viscoelastic and diffusion measurements. Several nearly monodisperse linear samples of each species were used. Zero-shear viscos