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Enthalpy and Volume Relaxation of Core-Crosslinked Star Polystyrene/Poly(methyl methacrylate) Blends

✍ Scribed by Steven Spoljaric; Antonietta Genovese; Tor Kit Goh; Anton Blencowe; Greg G. Qiao; Robert A. Shanks

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
967 KB
Volume
212
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Blends of linear and core‐crosslinked star (CCS) polymers are prepared. The relaxation and thermal properties of the blends are determined using conventional and modulated‐temperature DSC and modulated‐temperature thermomechanometry. Addition of CCS polymers increase the glass transition temperature while decreasing the enthalpy and the linear coefficient of thermal expansion, suggesting that the hyperbranched polymers restrict matrix chain motions. Isothermal annealing increased the T~g~ and Δ__H__ and decreased sub‐T~g~ α due to the reduced free volume and mobility within the polymer films. Volume relaxation during annealing is observed using mT‐TM, while a stretched‐exponential function is utilised to interpret the data. magnified image

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Enthalpy Relaxation in Poly(4-hydroxysty
Enthalpy Relaxation in Poly(4-hydroxystyrene)/Poly(methyl methacrylate) Blends
✍ Iain M. G. Cowie; Valeria Arrighi; Elizabeth-Anne McGonigle 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 184 KB

## Abstract Summary: The influence of blend composition on enthalpy relaxation behaviour was assessed for miscible blends of poly(4‐hydroxystyrene)/poly(methyl methacrylate) (PHS/PMMA). Values of enthalpy lost (Δ__H__(__T__~a~, __t__~a~)) were calculated from experimental data plotted against log~1