有机蒙脱土改性超支化聚酰胺6的制备与表征

发布时间：2018-07-13 12:27

【摘要】：以枝化剂为超支化聚酰胺6(PA6)的引发剂,配以含有端羧基官能团的有机改性剂改性的有机蒙脱土(O-MMT),经原位开环接枝聚合制备了O-MMT/超支化PA6复合材料。通过FTIR和TEM表征了超支化PA6与O-MMT的接枝情况以及O-MMT在基体中的分散形态。研究了O-MMT对超支化PA6结晶性能、熔体流动性能和力学性能的影响。结果表明:O-MMT呈剥离态和插层态分散于超支化PA6基体中,且与PA6分子链段产生化学键合,形成网络交联结构。网络交联结构使O-MMT/超支化PA6复合材料与超支化PA6相比熔体流动指数急剧下降。另外,O-MMT使超支化PA6的α晶型消失,且使仅有γ晶型的超支化PA6的结晶度降低。但随O-MMT含量增加,O-MMT/超支化PA6复合材料的强度逐步提高,拉伸强度从38.4MPa提高至60.8 MPa。复合材料的韧性也得到大幅度提高,断裂伸长率从2.1%提高至70.1%,无缺口冲击强度从20.3kJ/m2急剧提高至291.8kJ/m2。
[Abstract]:O-MMT6 / hyperbranched PA6 composites were prepared by in situ ring-opening grafting polymerization with organic montmorillonite (O-MMT) modified by organic modifiers with carboxyl terminated functional groups using branching agent as initiator of hyperbranched polyamide 6 (PA6). The grafting of hyperbranched PA6 onto O-MMT and the dispersion morphology of O-MMT in the matrix were characterized by FTIR and TEM. The effects of O-MMT on the crystallization, melt flow and mechanical properties of hyperbranched PA6 were investigated. The results show that the structure of the molecular chain of the hyperbranched PA6 is formed by chemical bonding with the molecular segment of PA6 and the structure of the network is formed by the separation and intercalation of the O-MMT in the peeling and intercalation states in the hyperbranched PA6 matrix. The melt flow index of O-MMT- / hyperbranched PA6 composites decreased sharply compared with that of hyperbranched PA6 composites. In addition, the 伪 -crystal form of hyperbranched PA6 disappeared and the crystallinity of hyperbranched PA6 with only 纬 -crystalline form decreased. However, with the increase of O-MMT content, the tensile strength of O-MMT / hyperbranched PA6 composites increased gradually, and the tensile strength increased from 38.4 MPA to 60.8 MPA. The toughness of the composites was also greatly improved, the elongation at break increased from 2.1% to 70.1%, and the notched impact strength increased sharply from 20.3 KJ / m2 to 291.8 KJ / m2.
【作者单位】：中南大学粉末冶金国家重点实验室;株洲时代新材料科技股份有限公司;
【基金】：株洲时代新材料科技股份有限公司校企联合培养基金(JZ-GL-12-01)
【分类号】：TB332

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