Interpenetrating network formation in isotactic polypropylene/graphene composites
Interpenetrating network formation in isotactic polypropylene/graphene composites
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等规聚丙烯/石墨烯复合材料中互穿网络的形成
DOI：
10.1016/j.polymer.2013.04.059
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发表时间：
2013-06
期刊：
影响因子：
4.6
通讯作者：
Charles C. Han
中科院分区：
文献类型：
--
作者：
Songmei Zhao;Fenghua Chen;Yingjuan Huang;JinYong Dong;Charles C. Han
研究了原位聚合的等规聚丙烯/石墨烯纳米复合材料在退火过程中的形态结构演变。采用原位淤浆聚合法，以石墨烯为载体，Ziegler-Natta为催化剂制备了该材料。在相对低的石墨烯浓度下，在样品退火长时间（一到几个小时）后观察到互穿网络。交替电导率阻抗谱测量表明，一个显着的电导率增加了几个数量级的网络形成后。在非常低的石墨烯含量下，虽然不能形成宏观网络，但也可以通过退火来增强导电性。这意味着团簇或聚集体的重排是必要的，这种重排有利于网络的形成。通过光学和电子显微镜方法研究了网络形成过程，并基于粘弹性相分离模型进行了讨论。研究了网络结构对结晶行为的影响。结果表明，石墨烯片晶的存在促进了整体结晶，但在网络形成后，由于空间限制和可用于异相成核的总表面积减少，结晶受到抑制。
Morphological structure development of thein-situpolymerized isotactic polypropylene/graphene nanocomposites was investigated during the annealing process. The material was prepared via anin-situslurry polymerization method with graphene-supported Ziegler–Natta catalyst. An interpenetrating network was observed at a relatively low graphene concentration after the sample was annealed for a long period (one to several hours). Alternative Conductivity impedance spectroscopic measurements showed a remarkable electrical conductivity increase of several orders of magnitude after the network was formed. At very low graphene content, although macroscopic network cannot be formed, the electrical conductivity can be enhanced through annealing as well. It implied that the rearrangement of the clusters or aggregates was necessary and such rearrangement favored the network formation. The network forming process was investigated through optical and electron microscopy methods and discussed based on the viscoelastic phase separation model. The effect of network on the crystallization behaviors was also investigated. It showed that the overall crystallization was improved by the presence of graphene platelets, but depressed after the network was formed, which was due to the spatial confinement and the decrease of total surface area available for heterogeneous nucleation.
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