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The microdomain structure of a model three-component, three-arm, star-shaped copolymer consisting of polystyrene (PS), poly(dimethylsiloxane) (PDMS) and poly(tert-butyl methacrylate) (PTBMA), each of them having nearly the same weight fraction, was investigated by means of differential scanning calorimetry (d.s.c.), transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). D...
Abstract Simultaneous measurements of stress relaxation and differential dynamic modulus were made at 268K over a time scale of 10 to 104.5s for nearly monodisperse polybutadiene (Mw=2.2105, 1,2-structure 70%, Me=3600) and also one having coarse cross-linking (Mc=29000). Static shear strain ranged from 0.1 to 2.0. In a long-time region (tk), the relaxation modulus G(;t) could be expressed by the product...
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