石墨烯/氧化石墨烯-聚乳酸的制备与表征

通过优化Hummers法制备了氧化石墨烯,并用水合肼还原法制备了石墨烯,且对自制的石墨烯和氧化石墨烯进行了测试及分析;然后通过溶液插层法制得纳米级聚乳酸/石墨烯和聚乳酸/氧化石墨烯复合材料,并对其分散性、热学性能以及力学性能进行了分析。对石墨烯和氧化石墨烯的表征结果说明,水合肼可以还原氧化石墨,所制备的石墨烯纯度较高。对聚乳酸/石墨烯和聚乳酸/氧化石墨烯复合材料的性能分析结果表明,在聚乳酸的结晶度、结晶速率和对聚乳酸的结晶成核上,石墨烯比氧化石墨烯具有更优异的表现,但在热稳定性能方面,氧化石墨烯比石墨烯优异;在力学性能方面,有增强和降低两种影响,添加少量氧化石墨烯时聚乳酸的力学性能降低,而含质量分数为0.5%的石墨烯复合材料在拉伸实验和冲击实验中的增强效果较为明显。

Preparation and Characterization of Graphene/PLA and Graphene Oxide/PLA

Graphene and oxide graphene were prepared by optimizing Hummers and hydrazine reduction methods, then graphene/PLA and graphene oxide/PLA were prepared by the solution intercalation. The dispersion, thermal and mechanical properties were also analyzed and compared. The characterization results of graphene and graphene oxide indicated that hydrazine hydrate could reduce graphene oxide and the graphene prepared is of high purity. The characterization results of graphene/PLA and graphene oxide/PLA indicated that graphene performed better than graphene oxide in the aspects of crystallinity, crystallization rate and crystal nucleating, but graphene oxide excelled at thermal stability. The mechanical properties reduced when a small amount of graphene oxide was added. However, by adding 0.5% graphene, the tensile strength and impact strength reached the maximum.