【作者】 吕召胜；

【导师】 毛立新；

【作者基本信息】 北京化工大学 ， 材料加工工程， 2005， 硕士

【摘要】 本论文以聚丙烯(PP)、低密度聚乙烯(LDPE)为基体,以三元乙丙橡胶(EPDM)为PP增韧改性剂,以凹凸棒土(AT)为填充剂,采用不同熔融共混工艺,分别制备了PP/AT、PP/EPDM/AT、LDPE/AT纳米复合材料,并借助FTIR、DSC、TEM、SEM、材料拉伸实验、Izod冲击实验等一系列现代测试手段,分别对凹凸棒土的改性效果、分散状态以及复合材料的结构与性能进行了研究。 结果表明,以AG-102作为表面改性剂,选择适当的改性工艺,可以实现AT在PP和LDPE基体中的纳米级均匀分散;在PP/AT复合体系中适当加入聚丙烯接枝马来酸酐(MPP)作为增容剂,可以有效地改善AT与PP基体的相容性,使复合材料的拉伸和缺口冲击性能均得到明显提高;采用两步法制备工艺,可以获得具有微胶囊型分散相结构特征的PP/EPDM/AT三元纳米复合体系,且当EPDM含量为20%、AT含量为1～5%时,该复合体系具有较好的力学性能。 此外,以EBS作为分散剂,以AG-102改性AT作为填充剂,当AT尺寸为360目、添加含量为2%时,采用二步法制备工艺可以获得力学性能较好的LDPE/AT纳米复合材料;LDPE和LDPE/AT纳米复合材料在拉伸试验中均表现出明显的双屈服现缘,其中纯LDPE主要以A更多还原

【Abstract】 The nano-composites of Polypropylene (PP) /Attapulgite (AT), PP/EPDM/ AT and LDPE/AT were prepared by using different melt blending technologies. The surface modification of AT, the structure, morphology and mechanical properties of the nano-composites were studied systematically in terms of a series of modern analysis methods such as FTIR, DSC, TEM, SEM, tensile tester, Izod impact tester etc.Based on the experimental data, some important results were achieved. First, the homogeneous dispersion of AT to the nano scale in the PP and LDPE matrix was achieved when AG-102 was used as the surface modification agent and the appropriate process was selected. Second, the compatibility of AT and PP matrix was modified effectively when the PP-g-MAH was used as the compatibilizer in the composites of PP/AT, which resulted in the increase of the tensile and impact properties of the composites. Third, the composites of PP/EPDM/AT with the micro- capsulated stmcture of the dispersed phase were prepared by using two-step melt blending technology,更多还原