制备了聚甲醛(POM)/碳纳米管(CNTs)/弹性体(TPU)三元共混复合材料.考察了碳纳米管改性弹性体对聚甲醛的增韧效果及取向行为.结果表明,碳纳米管可有效地增强增韧弹性体,在1%(质量分数,下同)的碳纳米管存在下,TPU拉伸强度由54.6 MPa提高到66.0 MPa,提高21%左右,断裂伸长率由684%提高到801%,提高约17%.与未改性弹性体相比,CNTs改性弹性体对聚甲醛的增韧效果更显著.加入20%的固相力化学法改性TPU弹性体,碳纳米管含量仅为0.1%,断裂伸长率达到180%,同未改性体系相比,提高到近3倍.
POM/CNTs/TPU composites were prepared by a mechanochemical process. The results show that CNTs/can improve the mechanical properties of TPU. At 1% CNTs content， the tensile strength of TPU increases from～54.6 Mpa to～66.0 Mpa by～21% and the elongation at break increases from～684% to～801% by ～17%， Compared with unmodified TPU elastomer， CNTs-modified elastomer has a much better effect on the elongation at break for POM. At a content of 20 % CNTs-modified TPU elastomer， when CNTs content is 0.1%，the elongation at break of CNTs/TPU/POM composite reaches～180%， 3 times than that of TPU/POM. The stretching orientation behavior of CNTs in the matrix was confirmed by SEM.
参考文献
| [1] | 于建,王书武,黄国锋,孙喜梅.丁腈橡胶对聚甲醛树脂的增韧机理研究[J].高分子学报,2000(01):90-94. |
| [2] | Xia HS.;Wang Q.;Qiu GH. .Polymer-encapsulated carbon nanotubes prepared through ultrasonically initiated in situ emulsion polymerization[J].Chemistry of Materials,2003(20):3879-3886. |
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