Facile preparation of poly(p-phenylene benzobisoxazole)/graphene composite films via one-pot in situ polymerization
Facile preparation of poly(p-phenylene benzobisoxazole)/graphene composite films via one-pot in situ polymerization
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一锅法原位聚合轻松制备聚对亚苯基苯并二恶唑/石墨烯复合薄膜
DOI：
10.1016/j.polymer.2015.06.047
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发表时间：
2015-08
期刊：
影响因子：
4.6
通讯作者：
Yudong Huang
中科院分区：
文献类型：
--
作者：
Xianglong Li;Guangshun Wu;Fei Xie;Yudong Huang
自被发现以来，石墨烯在高性能纳米复合材料中显示出作为增强剂的前景。在本研究中，我们描述了一种设计和制备聚对苯撑苯并双恶唑(PBO)/石墨烯复合材料的新方法。采用4，6-二氨基间苯二酚(DAR)对氧化石墨烯(GO)进行修饰，以改善GO在聚合物基质中的反应性、溶解性和分散性。在不进行分离纯化的情况下，通过原位聚合将GO-DAR与PbO进一步结合，并通过热成型工艺得到PbO/GO复合薄膜。对GO-DAR和PbO/GO薄膜的结构和形貌进行了表征，并对其力学性能和热性能进行了研究。GO的加入提高了PBO的热稳定性。力学性能测试表明，在GO载荷量为1.5wt%时，PbO/GO薄膜的拉伸强度(148 Mpa)和杨氏模量(6.2 GPA)分别比PbO薄膜提高39.6%和72.2%。一锅法原位包覆了PbO链上的GO，改善了GO在PbO中的分散和排列，增强了PbO链的堆积有序性，这被认为是PbO性能提高的主要原因。
Since being discovered, graphene shows promise as reinforcements in high-performance nanocomposites. In the present study, we describe a novel strategy to design and prepare poly(p-phenylene benzobisoxazole) (PBO)/graphene composite. Graphene oxide (GO) was first modified by 4, 6-diaminoresorcinol (DAR) to improve the reactivity, solubility, and dispersivity of GO in polymer matrix. Without separation and purification, GO-DAR was further incorporated with PBO through in situ polymerization, and PBO/GO composite films were obtained by thermoforming process. The structure and morphology of GO-DAR and PBO/GO films were characterized and the mechanical and thermal properties were investigated. The incorporation of GO improved the thermal stability of PBO. Mechanical property measurements revealed that the PBO/GO films exhibited a tensile strength (148 MPa) and Young's modulus (6.2 GPa) at a GO loading of 1.5 wt%, corresponding to 39.6% and 72.2% increase compared to the PBO film, respectively. The one-pot in situ procedure wraps GO with PBO chains, improves the dispersion and alignment of GO in PBO matrix, enhances PBO chain packing order, which are considered to be the main reasons for the performance improvement of PBO.
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