【作者】 徐本梁；

【导师】 林金辉；

【作者基本信息】 成都理工大学 ， 矿物材料学， 2011， 硕士

【摘要】 聚丙烯(PP)是一种广泛应用的通用塑料,结构规整而易于结晶,生成的球晶较大,使PP易于产生裂纹,冲击强度较低,限制了其应用范围。因此,对PP进行增强、增韧改性显得尤为重要。论文利用微晶白云母和尼龙6(PA6)对聚丙烯进行增强、增韧改性。在对微晶白云母改性的基础上,采用熔融共混法制备了微晶白云母/PP、PP/PA6/PE-g-MAH、微晶白云母/PP/PA6/PE-g-MAH复合材料,研究了复合材料的力学性能,探讨了微晶白云母与PA6增强增韧PP机理。论文取得的主要成果包括:1.利用硅烷KH-550偶联剂对微晶白云母进行了表面改性,改善微晶白云母与PP的界面性能。表征结果表明,硅烷KH-550改性微晶白云母的较佳用量为0.9%,硅烷KH-550可能与微晶白云母之间形成了化学键合。2.制备了微晶白云母/PP复合材料,力学性能分析表明,当添加改性微晶白云母用量为PP质量10%时,复合材料综合力学性能最优,其拉伸强度为36.94 MPa ,缺口冲击强度为6.25 KJ/m2,分别较纯PP提高了13%和10%。3.通过对PP/PA6/PE-g-MAH复合材料力学性能研究,优化了相容剂PE-g-MAH的较佳用量为PP质量的4%。4.微晶白云母/PP/PA6/PE-g-MAH复合材料力学性能研究表明,当微晶白云母和PE-g-MAH添加量分别为PP质量的12%和4%时,体系综合力学性能最优,其拉伸强度为40.1 MPa,缺口冲击强度为8.46 KJ/m2。力学性能明显优于纯PP、微晶白云母/PP、PP/PA6/PE-g-MAH体系。5.聚丙烯增强增韧机理分析表明,微晶白云母、PP、PA6熔融共混后,PA6和微晶白云母分散在基体PP中。当材料受到冲击时,PP、PA6内部产生的空洞和银纹吸收能量,提高了材料韧性;PP/PA6界面变形、微晶白云母/PP界面变形缓冲能量,提高了材料强度。更多还原

【Abstract】 Polypropylene (PP) is a widely used universal plastic which hold regular structures, it is easy to crystallize, and the polymer spherulites make it cracks as well as low impact resistance, all defects limit its further application. Reinforcing and toughening is meaningful to PP .The paper is aimed at using micro-crystal muscovite and nylon6(PA6) to modify polypropylene. Microcrystal muscovite/PP, PP/PA6/PE-g-MAH, microcrystal muscovite/PP/PA6 / PE-g-MAH composites were prepared through melting blend method based on the modification of micro-crystal muscovite. The mechanical properties of the material was studied, and the toughening mechanism was discussed either. The main research contents and acquisition results in this paper was listed below:1 KH550 was used as a coupling agent to modify the surface of micro-crystal muscovite on the purposes of improving the interface properties between micro-crystal muscovite and PP. The results showed that there should be some chemical bonding when KH-550 was added about 0.9%.2 Microcrystal-muscovite/PP composite was prepared. The analysis of mechanical performance showed that the composite displayed a best comprehensive mechanical performance when micro-crystal muscovite was used about 10% to PP. The results followed as: The tensile strength was 36.94 MPa and the impact strength was 6.25 KJ/m2, which were increased 13% and 10% respectively than PP.3 The amount of compatibilizer PE-g-MAH was optimized through the tests of mechanical properties of PP/PA6 / PE-MAH composite which was about 4% to PP.4 The mechanical performance tests of micro-crystal muscovite/PP/PA6 / PE-g-MAH composite showed that the composite displayed a best comprehensive mechanical performance when micro-crystal muscovite and PE-g-MAH were used about 12% , 4% to PP respectively. The results followed as: The tensile strength was 40.1MPa and the impact strength was 8.46 KJ/m2 that was obviously better than PP, micro-crystal muscovite/PP as well as PP/PA6/PE-g-MAH.5 The toughened mechanism analysis of Polypropylene showed that after molten blend of micro-crystal muscovite, PP and PA6 , micro-crystal muscovite was dispersed in the matrix of PP. When impacts happened, the cavities and silver lines that caused by PP and PA6 could absorb energy which manifested as an enhancement of toughness. The interface deformation of PP/PA6 and micro-crystal muscovite/PP could buffer energy which showed an improvement of material strength.更多还原