交联配方组分对微交联聚丙烯力学性能的影响

Effect of Composition in Crosslinking Formulas on Mechanical Properties of Light-crosslinked Polypropylene

以过氧化二异丙苯(DCP)为引发剂,二硫化四甲基秋兰姆(TMTD)为交联助剂,研究了4种交联单体,三烯丙基异三聚氰酸酯(TAIC)、二乙烯基苯(DVB)、N,N-亚甲基双丙烯胺(MBA)和硫磺(S),对PP力学性能的影响。在此基础上,考察了DCP、TMTD和DVB之间的相互作用对PP力学性能的影响,并对其相互作用机理进行了探讨。研究结果表明,当PP/DCP/TMTD/DVB的比例为100/0.2/0.05/0.4时,DVB交联的PP力学性能达到最佳值,其拉伸屈服强度、弯曲强度和冲击强度相对纯PP分别提高了20%、32%和75%。DCP、TMTD、DVB这三者之间的相互关系为:DCP抑制TMTD与PP进行反应、DCP促进DVB与PP进行交联、TMTD抑制DVB与PP进行交联。

The effect of four kinds of crosslinking monomers including triallyl isopropyl cyanide（TAIC）,divinylbenzene（DVB）, N,N-methylenebispropylamine（MBA） and sulfur（S） on the mechanical properties of chemically-modified PP were investigated using dicumyl peroxide（DCP） as initiator and tetramethyl thiuram disulfide（TMTD） as cross-linking co-agent. On the basis of this, the effects of the interaction between DCP, TMTD and DVB on the mechanical properties of chemically-modified PP were studied in detail, and the interaction mechanism was discussed. The results showed that when the ratio of PP/DCP/TMTD/crosslinker was of 100/0.2/0.05/0.4, the mechanical properties of chemically-modified PP were the best, and the tensile yield strength, flexural strength and impact strength were increased by 20%, 32% and 75%, respectively, compared to those of pure PP. The interrelationships between DCP, TMTD and DVB were as following： DCP inhibited the reaction of TMTD with PP, DCP promoted the crosslinking of DVB with PP, and TMTD inhibited the crosslinking of DVB with PP.