Orientation and relaxation in uniaxially-stretched poly(2,6-dimethyl 1,4-phenylene oxide) — atactic polystyrene blends |
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Authors: | D Lefebvre B Jasse L Monnerie |
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Affiliation: | Laboratoire de Physico-chimie Structurale et Macromoléculaire, Ecole Supérieure de Physique et de Chimie, 10, rue Vauquelin 75231 Paris Cedex 05, France |
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Abstract: | Infra-red measurements of the dichroic ratio of atactic polystyrene and poly(2,6-dimethyl 1,4-phenylene oxide) absorption bands provide a valuable method for the determination of orientation as well as relaxation of chains of both polymers during stretching of their compatible blends. Influence of strain rate, temperature of stretching, and molecular weight of the polymers on orientation of both polymer chains in blends containing up to 35% PPO has been studied. Orientation relaxation for both polymers has been analysed using Lodge's constitutive equation. Master curves have been obtained for PPO and PS in the blends at a reference temperature T0 = Tg + 10°C. Results are interpreted in terms of an hindrance of relaxation of PS chains induced by interaction with a highly-oriented PPO network which slowly relaxes. |
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Keywords: | PPO PS polymer blends orientation relaxation Fourier-transform infra-red spectroscopy |
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