| 振荡剪切流场下PS/PVME/SiO2复合物的相行为 |
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| 引用本文： | 李楠,黄亚江,夏天,杨其,李光宪.振荡剪切流场下PS/PVME/SiO2复合物的相行为[J].高等学校化学学报,2013,34(12):2896. |
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| 作者姓名： | 李楠 黄亚江 夏天 杨其 李光宪 |
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| 作者单位： | 四川大学高分子科学与工程学院, 高分子材料工程国家重点实验室, 成都 610065 |
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| 基金项目： | 国家自然科学基金（批准号：51003062，51121001）资助. |
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| 摘 要： | 利用光学显微镜-剪切台联用系统研究了振荡剪切流场下聚苯乙烯（PS）/聚甲基乙烯基醚（PVME）/二氧化硅（SiO2）纳米粒子复合物的热力学稳定性. 结果表明，小振幅振荡剪切可导致PS/PVME共混物出现类似在稳态流场下的剪切诱导相容及剪切诱导相分离现象. 共混体系存在临界振荡频率ωc，当振荡频率低于ωc时，发生剪切诱导相分离（SID）行为，反之发生剪切诱导相容（SIM）行为. SiO2纳米粒子的加入使复合体系的相容性提高. 存在一个临界SiO2纳米粒子含量φc，当SiO2纳米粒子含量高于φc时，复合体系中不存在临界振荡频率ωc，低振荡频率下的剪切诱导相分离得到抑制. 此外，复合体系的上述行为与升温速率和共混物组成密切相关.
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| 关 键 词： | 聚苯乙烯/聚甲基乙烯基醚共混物 SiO2纳米粒子 振荡剪切 相行为 |
| 收稿时间： | 2013-05-15 |
Phase Behavior of PS/PVME/SiO2 Blends Under Oscillatory Shear Flow Field |
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| LI Nan,HUANG Ya-Jiang,XIA Tian,YANG Qi,LI Guang-Xian.Phase Behavior of PS/PVME/SiO2 Blends Under Oscillatory Shear Flow Field[J].Chemical Research In Chinese Universities,2013,34(12):2896. |
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| Authors: | LI Nan HUANG Ya-Jiang XIA Tian YANG Qi LI Guang-Xian |
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| Institution: | College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065, China |
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| Abstract: | The thermodynamics of polystyrene/poly(vinyl methyl ether)(PS/PVME) blends under oscillatory shear flow field were studied in the presence of hydrophilic fumed silica nanoparticles via online optical-shear technique. Similar to that observed in steady shear flow, it was found that there also existed a critical oscillatory frequency below which shear-induced demixing(SID) behavior was found while above which shear-induced mixing(SIM) behavior was presented. The addition of silica nanoparticles improved the miscibility of composites. There existed a critical nanoparticle content above which the oscillatory shear induced mixing and the critical oscillatory frequency behavior disappeared. The behavior showed a strong dependence both on the heating rate and the blend composition. |
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| Keywords: | Polystyrene/poly(vinylmethyl ether) blend SiO2 Nanoparticles Oscillatory shear flow Phase behavior |
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