【摘要】 在传统橡胶增韧塑料体系中,由于橡胶含量通常大于10%(质量分数,下同),不仅提高了材料的成本而且大幅降低了材料的强度和模量。文中报道了以马来酸酐化低分子量聚丁二烯(MLPB)接枝改性的线性低密度聚乙烯(LLD-PEg)为增韧剂,通过反应挤出的方法制备了LLDPEg与尼龙6(PA6)的合金。利用在反应挤出过程中LLDPEg增韧剂中马来酸酐(MAH)与PA6中端胺基的反应,在合金体系中形成以LLDPE为核,MLPB为壳的核-壳结构。结果发现体系中MLPB净含量只有3%时,核壳增韧体系的缺口冲击强度最高可达到118kJ/m2。与POE-g-MAH增韧PA6的体系相比,在相同增韧剂含量的情况下,核壳增韧体系的冲击强度和拉伸强度都更高。更多还原

【Abstract】 When a thermoplastic is toughened by a rubber or elastomer, the modulus loss is unavoidable due to the low toughener modulus and high toughener content. However, the modulus loss can be reduced even with high impact strength when a core-shell toughener with rigid core and soft shell is used. In this work, maleated low molecular weight polybutadiene (MLPB) functionalized linear low-density polyethylene (LLDPEg) and its alloys with polyamide 6 (PA6) were prepared via reactive extrusion. Core-shell particles with LLDPE core and MLPB shell has been formed through the reaction between maleic anhydride (MAH) in LLDPEg and amino group in PA6. The notched impact strength of PA6/LLDPEg blends can reach 118kJ/m2 when the neat MLPB rubber content is less than 3%. Compared to those PA6/POE-g-MAH blends with the same toughener content, PA6/LLDPEg systems have relatively higher notched impact strength and tensile strength.更多还原