Richard A. Pethrick

TL;DR: In this paper, a rubber-modified epoxy resin resin was used to measure the temperature dependence of the o-positronium lifetime and the associated transition temperatures by comparison with dilatometric data can be ascribed respectively to a glass transition of the epoxy phase and to that of a mixed acrylonitrile-epoxy-butadiene interfacial region.

TL;DR: In this paper, two series of polyether polyurethanes, chain extended by ethylene glycol, have been synthesised with rigid exclusion of moisture to avoid side reactions, and SIMS analysis showed that even with surface segregation of soft block, some hard block was present at the outermost surface.

TL;DR: In this paper, the authors show that the frequency dependence of the viscoelasticity is sharper than expected for very flexible long chains, and indicate that the restricted mobility of chain segments observed in the acoustic, and other, experiments reduces the number of normal modes contributing to the high frequency end of the viscous loss spectrum.

TL;DR: In this article, a series of copolymers formed between methyl styrene or styrene and various α, ω-alkyl dihalides were studied and a comparison of the 13 C relaxation data with that obtained from ultrasonic relaxation measurements supports the hypothesis that in the higher members of each series the alkane chain moves essentially independently of the styrene moiety.

TL;DR: In this article, a study of acoustic relaxation on dilute solutions of three tactic forms of poly(methyl methacrylate) and two of poly (α-methylstyrene) is presented.