摘要
采用甲苯-2,4-二异氰酸酯(TDI)对氧化石墨烯(GO)进行表面接枝改性,制得TDI功能化GO(TDIGO),再将其分散于4,4’-二苯基甲烷二异氰酸酯中,经原位聚合法制备TDI-GO/热塑性聚氨酯弹性体(TPU)复合材料。利用FTIR、XPS、DSC、TG、SEM、维卡软化温度和拉力试验机等测试手段,表征和分析了TDI-GO的表面结构及TDI-GO含量对TDI-GO/TPU复合材料结构与性能的影响。结果表明,TDI成功接枝改性GO,TDIGO的加入使TPU体系的微相分离程度减弱,其异相成核作用提高了TPU硬段相的结晶性能;相比纯TPU基体,TDI-GO/TPU复合材料耐热性能提高,当TDI-GO添加量为0.5wt%时,复合材料5%热失重温度提高了约9℃,维卡软化温度提高了约18℃;TDI-GO/TPU复合材料力学性能明显提高,与纯TPU相比,TDI-GO含量为0.5wt%的TDI-GO/TPU复合材料拉伸强度提高了近10 MPa,断裂伸长率提高了约32%。
The functionalized graphene oxide （TDI-GO） was prepared by grafting 2, 4-di-isocyanate（TDI） onto the surface of GO. Then a series of TDI-GO/thermoplastic polyurethane elastomer（TPU） composites with different TDI-GO contents were prepared by prepolymer method via in-situ polymerization. The structure of TDI-GO was characterized and the infiuences of the dosage of TDI-GO on the structure and properties of TDI-GO/TPU compos- ites were studied by FTIR, XPS, DSC, TG, SEM, the Vicat softening temperature and the mechanical property tester. The results demonstrate that, TDI successfully graft onto GO; TDI-GO can decrease microphase separation of TPU, and improve the crystallinity of hard segment as a heterogeneous nucleation agent; comparing with the pristine TPU, TDI-GO/TPU composites have excellent thermal properties, when the mass fraction of TDI-GO is 0. 5wt%, the 5% degradation temperature increases by 9℃, and the Vicat softening temperature raises by 18℃; the mechanical properties of TDI-GO/TPU composites enhance markedly, comparing with the pristine TPU, when the mass fraction of TDI-GO is 0.5wt%, the tensile strength increases almost 10 MPa, and the elongation at break- ing increases about 32%.
作者
白静静
尹建宇
高雄
BAI Jingjing;YIN Jianyu;GAO Xiong(Department of Materials Engineering,Taiyuan Institute of Technology,Taiyuan 030008,Chin)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2018年第7期1683-1690,共8页
Acta Materiae Compositae Sinica
基金
太原工业学院大学生创新创业训练项目(GK20170112)
关键词
氧化石墨烯
异氰酸酯
表面改性
热塑性弹性体
热性能
graphene oxide
isocyanate
surface modification
thermoplastic elastomer
thermal property
