聚丙烯种类对硅烷交联PP/POE(EPDM)共混材料性能的影响

Effect of Polypropylene Types on Properties of Silane Crosslinked PP/POE (EPDM) Blends

目的针对聚丙烯原料的选择对硅烷交联PP/POE(EPDM)共混材料性能的影响,进行系统的研究分析。方法固定PP和POE(EPDM)的质量比为70∶30,添加VTMS,DCP,DBTDL的质量分数为1.5%,0.1%和0.1%,制备分别以PP-B和PP-H为基体材料的硅烷交联共混材料;研究2种共混材料的凝胶含量、结晶行为、流变性能、力学性能、微观结构等的差异,分析不同基体聚丙烯对硅烷交联聚丙烯共混材料力学性能产生影响的原因。结果虽然PP-B的性能优于PP-H,但与POE(EPDM)硅烷交联后,PP-H在力学性能、热稳定性等方面优于PP-B,PP-B的交联程度更高。结论在PP/POE(EPDM)硅烷交联材料的选择中,为了达到节省资源,并获得最佳性能的目的,应充分考虑聚丙烯原料种类对共混材料性能的影响,以选择出最优方案。

The work aims to systematically study and analyze the effects of polypropylene raw material selection on the properties of silane crosslinked PP/POE(EPDM) blends.The mass ratio of fixed PP to POE(EPDM) was 70∶30.The mass fractions of added VTMS,DCP and DBTDL were 1.5%,0.1% and 0.1%,respectively.Silane crosslinked blends with PP-B and PP-H as matrix materials were prepared.The differences of gel content,crystallization behavior,rheological properties,mechanical properties and microstructure between the two blends were studied,and the reasons why different matrix polypropylenes affected the mechanical properties of silane crosslinked polypropylene blends were analyzed.The performance of PP-B was better than PP-H,but PP-H was superior to PP-B in mechanical properties and thermal stability after silane crosslinked with POE(EPDM).PP-B had higher crosslinking degree.In the selection of PP/POE(EPDM) silane crosslinked materials,in order to achieve resource saving and optimal performance,the influence of the type of polypropylene raw materials on the properties of the blended materials should be fully considered to select the optimal solution.