高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (2): 302.

• 论文 • 上一篇    下一篇

AB/C型嵌段共聚物/均聚物的共混体系的相容性和形态研究(Ⅲ)──共混物的焓弛豫

黄天滋, 谢静薇, 江明   

  1. 复旦大学高分子科学系, 上海 200433
  • 收稿日期:1994-05-26 修回日期:1994-10-18 出版日期:1995-02-24 发布日期:1995-02-24
  • 通讯作者: 江明
  • 作者简介:江明,第一作者,黄天滋,男,26岁,硕士,现在华东理工大学.
  • 基金资助:

    国家自然科学基金;国家基础性重大关键项目

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

HUANG Tian-Zi, XIE Jing-Wei, JIANG Ming   

  1. Department of Macromolecular Scienec, Fudan University Shanghai, 200433
  • Received:1994-05-26 Revised:1994-10-18 Online:1995-02-24 Published:1995-02-24

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被引次数

3

摘要： 嵌段共聚物PI-b-PMMA和不同羟基含量的改性聚苯乙烯PS(OH)组成的共混物因PM-MA嵌段和PS(OH)间的玻璃化转变相当接近而不能用通常的DSC法判别其相容性.通过共混物的焓弛豫,得到相容性明确的DSC判据,且与电镜观察结果一致.共混物中的Tg增宽效应可通过江明等提出的链密度梯度模型解释.

关键词: 共混物, 相容性, 特殊相互作用, 焓弛豫

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 Tgis 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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