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首页> 外文期刊>RSC Advances >Effect of graphene modified by a long alkyl chain ionic liquid on crystallization kinetics behavior of poly(vinylidene fluoride)
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Effect of graphene modified by a long alkyl chain ionic liquid on crystallization kinetics behavior of poly(vinylidene fluoride)

机译：长烷基链离子液体对聚（偏二氟乙烯氟）结晶动力学行为进行长烷基链离子液体的影响

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摘要

To investigate the effects of graphene (Gra) modified by a long alkyl chain ionic liquid (1-hexadecyl-3-methylimidazolium bromide, IL) on the crystallization kinetics behavior of poly(vinylidene fluoride) (PVDF), a series of PVDF/IL blend, PVDF/Gra and PVDF/IL/Gra nanocomposites have been prepared using a solution-cast method. The crystallization kinetics and corresponding crystal structure have been investigated using differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction spectroscopy (XRD). The crystallization kinetic parameters, such as relative crystallinity (X-t), crystallization half time (t(1/2)), crystallization rate constant (Z), Avrami exponents (n) and activation energy (E-a), have been determined by both isothermal and non-isothermal techniques. In the isothermal and non-isothermal crystallization process, for PVDF/0.5IL/0.5Gra, IL and Gra can facilitate nucleation to decrease E-a; moreover, the synergistic efforts of IL and Gra can maintain appropriate crystallization rate to form the beta phase extruded form the alpha phase. The positive effect on the crystallization of PVDF may be ascribed not only to the existence of Gra-cation interaction between the imidazolium cation and the aromatic carbon ring structure, but also to the electrostatic interaction between the >CF2 group of the polymer backbone and imidazolium cation.
机译：为了研究由长烷基链离子液体（1-十六烷基-3-甲基咪唑溴铵，IL）改性的石墨烯（Gra）对聚（偏二氟乙烯）（PVDF）的结晶动力学行为，一系列PVDF / IL的影响使用溶液浇铸方法制备混合物，PVDF / GRA和PVDF / IL / GRA纳米复合材料。使用差示扫描量热法（DSC），偏振光显微镜（POM）和X射线衍射光谱（XRD）研究了结晶动力学和相应的晶体结构。诸如相对结晶度（XT），结晶半段（T（1/2）），结晶率常数（Z），Avrami指数（N）和激活能量（EA）的结晶动力化参数已被等温和非等温技术。在等温和非等温结晶过程中，对于PVDF / 0.5il / 0.5gra，IL和GRA可以促进成核以减少E-A;此外，IL和GRA的协同努力可以保持合适的结晶速率以形成β相挤出的α相。对PVDF结晶的阳性效应不仅可以归因于咪唑鎓阳离子和芳族碳环结构之间的Gra-Catic相互作用，而且还归因于聚合物主链和咪唑鎓阳离子的> CF2基团之间的静电相互作用。

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  • 来源
    《RSC Advances》 |2015年第112期|共10页
  • 作者

    Hu Yadong; Xu Pei; Gui Haoguan; Yang Shanzhong; Ding Yunsheng;

  • 作者单位

    Hefei Univ Technol Sch Chem &

    Chem Engn Dept Polymer Mat &

    Engn Key Lab Adv Funct Mat &

    Devices Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Dept Polymer Mat &

    Engn Key Lab Adv Funct Mat &

    Devices Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Dept Polymer Mat &

    Engn Key Lab Adv Funct Mat &

    Devices Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Dept Polymer Mat &

    Engn Key Lab Adv Funct Mat &

    Devices Hefei 230009 Anhui Peoples R China;

    Hefei Univ Technol Sch Chem &

    Chem Engn Dept Polymer Mat &

    Engn Key Lab Adv Funct Mat &

    Devices Hefei 230009 Anhui Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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