Wang Li-Na, Guo Wang Pei-Yao, Wei Jun-Chao
College of Science, Nanchang Institute of Technology, Nanchang 330029, China.
College of Chemistry, Nanchang University, Nanchang 330031, China.
Polymers (Basel). 2017 Sep 7;9(9):429. doi: 10.3390/polym9090429.
The surface modification of graphene sheets with polymer chains may greatly hinder its aggregation and improve its phase compatibility with a polymer matrix. In this work, poly(l-lactic acid)-grafted graphene oxide (GO-g-PLLA) was prepared via a simple condensation polymerization method, realizing its dispersion well in organic solvents, which demonstrated that the surface of GO changed from hydrophilic to hydrophobic. GO-g-PLLA can disperse homogeneously in the PLLA matrix, and the tensile test showed that the mechanical properties of GO-g-PLLA/PLLA were much better than that of GO/PLLA; compared with GO, only 3% GO-g-PLLA content can realize a 37.8% increase in the tensile strength for their PLLA composites. Furthermore, the differential scanning calorimetry (DSC) and polarized optical microscopy (POM) results demonstrated that GO-g-PLLA shows a nucleating agent effect and can promote the crystallization of PLLA.
用聚合物链对石墨烯片进行表面改性可能会极大地阻碍其聚集，并改善其与聚合物基体的相相容性。在这项工作中，通过简单的缩聚方法制备了聚（L-乳酸）接枝氧化石墨烯（GO-g-PLLA），实现了其在有机溶剂中的良好分散，这表明GO的表面从亲水性转变为疏水性。GO-g-PLLA可以在PLLA基体中均匀分散，拉伸试验表明，GO-g-PLLA/PLLA的力学性能远优于GO/PLLA；与GO相比，仅3%的GO-g-PLLA含量就能使其PLLA复合材料的拉伸强度提高37.8%。此外，差示扫描量热法（DSC）和偏光显微镜（POM）结果表明，GO-g-PLLA具有成核剂作用，能够促进PLLA的结晶。
