氧化石墨烯增强的液晶聚氨酯的机械性能和形状记忆性能的增强
Enhancement in Mechanical and Shape Memory Properties for Liquid Crystalline Polyurethane Strengthened by Graphene Oxide.
作者信息
Li Yueting, Lian Huiqin, Hu Yanou, Chang Wei, Cui Xiuguo, Liu Yang
机构信息
Beijing Key Lab of Special Elastomer Composite Materials, College of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.
College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
出版信息
Polymers (Basel). 2016 Jul 19;8(7):236. doi: 10.3390/polym8070236.
Conventional shape memory polymers suffer the drawbacks of low thermal stability, low strength, and low shape recovery speed. In this study, main-chain liquid crystalline polyurethane (LCPU) that contains polar groups was synthesized. Graphene oxide (GO)/LCPU composite was fabricated using the solution casting method. The tensile strength of GO/LCPU was 1.78 times that of neat LCPU. In addition, shape recovery speed was extensively improved. The average recovery rate of sample with 20 wt % GO loading was 9.2°/s, much faster than that of LCPU of 2.6°/s. The enhancement in mechanical property and shape memory behavior could be attributed to the structure of LCPU and GO, which enhanced the interfacial interactions between GO and LCPU.
传统的形状记忆聚合物存在热稳定性低、强度低和形状恢复速度慢的缺点。在本研究中，合成了含有极性基团的主链液晶聚氨酯（LCPU）。采用溶液浇铸法制备了氧化石墨烯（GO）/LCPU复合材料。GO/LCPU的拉伸强度是纯LCPU的1.78倍。此外，形状恢复速度得到了显著提高。GO负载量为20 wt%的样品的平均恢复速率为9.2°/s，比LCPU的2.6°/s快得多。力学性能和形状记忆行为的增强可归因于LCPU和GO的结构，其增强了GO与LCPU之间的界面相互作用。
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