Miscibility and Morphology of AB/C-Type Block Copolymer/Homopolymer Blends(Ⅲ)──Enthalpy Relaxation of the Blends

Abstract

Abstract: Aseries of blends composed of block copolymer PI-b-PMMA and modified polystyrene PS(OH) with different contents of hydroxyl-containing units has been prepared and studied by DSC and TEM.The enthalpy relaxation method has been used to the blends.Physical aging below Tg gives rise to two separated enthlpy recovery peaks associated with PMMA blocks and PS(OH) respectively for the blends with lower(0 and 1.0 mol%) hydroxyl contents.while the blends with higher(1.7 and 5.0 mol%) hydroxyl contents show only one transition.This conclusion is in good accordance with that from TEM observation.Besides,for the blends,a substantial broadening of T_gis observed,which can be explained by"the segment-density gradient model"proposed by Jiang et al.

Key words: Blend, Miscibility, Specific interaction, Enthalpy relaxation

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HUANG Tian-Zi, XIE Jing-Wei, JIANG Ming. Miscibility and Morphology of AB/C-Type Block Copolymer/Homopolymer Blends(Ⅲ)──Enthalpy Relaxation of the Blends[J]. Chem. J. Chinese Universities, 1995, 16(2): 302.

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Miscibility and Morphology of AB/C-Type Block Copolymer/Homopolymer Blends(Ⅲ)──Enthalpy Relaxation of the Blends

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