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首页> 外文期刊>RSC Advances >Effect of chemically reduced graphene oxide on the isothermal and non-isothermal phase separation behavior of poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) binary polymer blends
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Effect of chemically reduced graphene oxide on the isothermal and non-isothermal phase separation behavior of poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) binary polymer blends

机译：化学降低的石墨烯氧化物对聚（甲基丙烯酸甲酯）/聚（苯乙烯 - 共丙烯腈）二元聚合物共混物等温和非等温相分离行为的影响

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摘要

The effect of a small amount of chemically reduced graphene oxide (CRGO) on the isothermal and non-isothermal phase separation behavior of poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) (PMMA/SAN) blends was investigated by using time-resolved small angle laser light scattering (SALLS). During the non-isothermal process, a quantitative logarithm function can be established to describe the relationship between the cloud point T-c and heating rate k as given by T-c = A ln k + T-0 for the unfilled and filled CRGO-filled PMMA/SAN systems. During the isothermal process, the TTS principle and WLF function are applicable to describe the temperature dependence of nonlinear phase separation behaviors at the early and late stages of spinodal decomposition (SD) for such unfilled and filled systems, indicating that the introduction of CRGO hardly changes the viscous diffusion essence of macromolecular chains during phase separation. However, the mechanical barrier effect of CRGO on the macromolecular viscous diffusion may result in the delay of their phase separation behavior. Furthermore, the effect of CRGO on the isothermal and non-isothermal phase-separation behavior of the blend matrix is found to be dependent on the composition of the blend matrix. CRGO may act as a nucleating agent to result in the decrease of T-c for the PMMA/SAN 37/63 system, while the mechanical barrier effect of CRGO on the macromolecular segment may retard the concentration fluctuation at the early stage of SD phase separation to cause the increase of T-c for the PMMA/SAN 57/43 system. Besides, when SAN is the minority of the blend matrix (PMMA/SAN 57/43), the selective location of CRGO may result in the more obvious viscosity increment and then the more remarkable hindering effect on the SD phase separation behavior of blend matrix.
机译：通过使用时间研究了少量化学减少的石墨烯氧化物（CRGO）对聚（甲基丙烯酸甲酯）/聚（苯乙烯 - 共丙烯腈）（PMMA / SAN）混合物的等温和非等温相分离行为的影响 - 溶解的小角度激光散射（SALLS）。在非等温过程中，可以建立定量对数函数，以描述由TC = A LN K + T-0给出的云点TC和加热速率K之间的关系，用于未填充和填充的CRGO填充的PMMA / SAN系统。在等温工艺期间，TTS原理和WLF功能适用于描述非线性相分离行为的温度依赖性在Spinodal分解（SD）的早期和晚期阶段，用于这种未填充和填充的系统，表明CRGO的引入几乎没有变化相分离过程中大分子链的粘性扩散精华。然而，CRGO对大分子粘性扩散的机械阻挡效应可能导致它们的相分离行为的延迟。此外，发现CRGO对混合物基质的等温和非等温相分离行为的影响取决于共混基质的组成。 CRGO可以作为成核剂，导致PMMA / SAN 37/63系统的TC减少，而CRGO对大分子区段的机械屏障效应可能会在SD相分离的早期延迟延迟浓度波动PMMA / SAN 57/43系统的TC增加。此外，当SAN是混合矩阵的少数群体（PMMA / SAN 57/43）时，CRGO的选择性位置可能导致更明显的粘度增量，然后对混合物基质的SD相分离行为更加显着的阻碍效果。

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  • 来源
    《RSC Advances》 |2015年第100期|共12页
  • 作者

    Lin Chao-ying; Liu Ting; Zuo Min; Li Hui-hui; Chen Qi; Zheng Qiang;

  • 作者单位

    Zhejiang Univ Dept Polymer Sci &

    Engn MOE Key Lab Macromol Synth &

    Functionalizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn MOE Key Lab Macromol Synth &

    Functionalizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn MOE Key Lab Macromol Synth &

    Functionalizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn MOE Key Lab Macromol Synth &

    Functionalizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn MOE Key Lab Macromol Synth &

    Functionalizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn MOE Key Lab Macromol Synth &

    Functionalizat Hangzhou 310027 Peoples R China;

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