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- 2018
异氰酸酯功能化氧化石墨烯/热塑性聚氨酯弹性体复合材料的制备与性能
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Abstract:
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（TDI-GO），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，TDI-GO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 influences of the dosage of TDI-GO on the structure and properties of TDI-GO/TPU composites 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 breaking increases about 32%. 太原工业学院大学生创新创业训练项目（GK20170112）
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