High Mechanical and Thermal Properties of Epoxy Composites with Liquid Crystalline Polyurethane Modified Graphene
High Mechanical and Thermal Properties of Epoxy Composites with Liquid Crystalline Polyurethane Modified Graphene
复制标题
液晶聚氨酯改性石墨烯环氧复合材料的高机械和热性能
DOI：
10.3390/polym10050485
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发表时间：
2018-05-01
期刊：
影响因子：
5
通讯作者：
Lu, Shaorong
中科院分区：
文献类型：
--
作者：
Li, Yuqi;Gao, Jian;Lu, Shaorong
石墨烯纳米片（GN）通常会导致与疏水性聚合物基质不相容，并且在加工过程中容易形成聚集体。本文通过GNs与苝双酰亚胺衍生物之间的堆积相互作用，然后液晶聚氨酯的原位聚合得到液晶聚氨酯改性GNs（GPLP）。光谱研究、元素分析和热性能证实了 GPLP 的成功堆叠和集成结构。 GPLP在环氧基体（EP）中良好的分散状态，以及GPLP与EP之间的强相互作用，导致GPLP/EP复合材料的热性能和机械性能显着提高。添加1.47 wt% GNs的GPLP/EP复合材料的冲击强度、杨氏模量、拉伸强度和韧性达到最高值，分别为54.31 kJ/m(2)、530.8 MPa、112.33 MPa和863 J/m(3)，较普通材料显着提高了210%、57%、143%和122%。分别为纯环氧树脂。此外，玻璃化转变温度显着提高了 33 摄氏度。希望这项工作可以用来开发更有效的方法来克服 GN 和聚合物之间的不良粘附性。
Graphene nanosheets (GNs) often result in incompatibility with the hydrophobic polymer matrix, and the tendency to form aggregates during processing. Herein, liquid crystalline polyurethane modified GNs (GPLP) were obtained by - stacking interactions between GNs and perylene bisimide derivatives, and then in-situ polymerization of liquid-crystalline polyurethane. Spectroscopic studies, elemental analysis, and thermal properties confirmed the successful - stacking and the integrated structure of GPLP. The good dispersion state of GPLP in the epoxy matrix (EP), and the strong interactions between GPLP and EP, lead to the significant improvement of the thermal and mechanical performance of the GPLP/EP composites. The impact strength, Young's modulus, tensile strength, and toughness of the GPLP/EP composites with 1.47 wt % GNs reached the highest values of 54.31 kJ/m(2), 530.8 MPa, 112.33 MPa and 863 J/m(3), which significantly increased by 210%, 57%, 143%, and 122% compared to that of neat epoxy, respectively. As well, the glass transition temperature increased by a notable 33 degrees C. It is hoped that this work can be used to exploit more efficient methods to overcome the poor adhesion between GNs and polymers.