高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (6): 969.

• 论文 • 上一篇    下一篇

PMMA/α-MSAN共混体系长时弛豫区域的时温叠加失效与相分离的关系

郑强1, 高桥雅兴2, 升田利史郎3   

  1. 1. 浙江大学高分子科学与工程学系, 杭州 310027;
    2. 京都工芸纤维大学高分子科学与工程学系, 京都 606 日本;
    3. 京都大学工学部材料化学系, 京都 606 日本
  • 收稿日期:1998-07-26 出版日期:1999-06-24 发布日期:1999-06-24
  • 通讯作者: 郑强,男,38岁,博士,教授.
  • 作者简介:郑强,男,38岁,博士,教授.
  • 基金资助:

    国家自然科学基金(批准号:59673020)资助课题

Relationship Between Breakdown of Time-temperature Superposition Principle and Phase-separation for PMMA/α-MSAN Blends

ZHENG Qiang1, TAKAHASHI Masaoki2, MASUDA Toshiro3   

  1. 1. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027;
    2. Department of Polymer Science and Engineering, Kyoto Institute of Technology, Kyoto 606, Japan;
    3. Division of Material Chemistry, Faculty of Engineering, Kyoto University, Kyoto 606, Japan
  • Received:1998-07-26 Online:1999-06-24 Published:1999-06-24

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摘要： 通过考察聚甲基丙烯酸甲酯(PMMA)/聚(α-甲基苯乙烯丙烯腈)(α-MSAN)共混体系动态粘弹函数的时温叠加,发现在终端区域时温叠加失效与其相分离有关.相分离使得终端区域的动态储能模量G′(或动态损耗模量G″)与频率的关系[lgG′(lgG″)～lgω]明显偏离经典粘弹模型.随组成的改变,时温叠加的失效呈现温度依赖性,其"失效温度"(Td)可很好地表征LCST类共混物的相分离,而且在用其表征相分离时,lgG′～lgω法比lgG′～lgG″法更优越.

关键词: 聚甲基丙烯酸甲酯/聚(&alpha, -甲基苯乙烯丙烯腈)共混物, 时温叠加, 动态粘弹函数, 相分离

Abstract: By examining superposition of viscoelastic functions of poly(methyl methacrylate)(PMMA)/poly(α-methylstyrene-co-acrylonitrile)(α-MSAN) blends, we found that breakdown of time-temperature superposition principle in the long time relaxation region(terminal region) is related to phaseseparation of this blends. Heterogeneity in the blends results in the relationship between dynamic storage modulus G′(or dynamic loss modulus G″) and frequency in the terminal region no longer obey the model of linear viscoelasticity. It is interesting that there exists temperature dependence of this breakdown. This breakdown temperature(Td) can be used as a criterion for phaseseparation of the blends and was considered superior to socalled critical temperature(Tb) obtained by plotting of lgG′vs. lgG″.

Key words: Poly(methyl methacrylate)/poly(α-methylstyrene-co-acrylonitrile) blends, Timet-emperature superposition, Dynamic viscoelastic functions, Phase-separation

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