高流动性GMT材料制备

Preparation of GMT Materials with High Fluidity

采用过氧化二异丙苯(DCP)来调节聚丙烯(PP)的摩尔质量,考察了DCP对PP的熔体质量流动速率(MFR)和力学性能的影响,并以此降解产物制得高流动性的增强增韧GMT材料。结果表明:随DCP用量的增加,基体树脂的MFR几乎呈线性增大,其弯曲模量与强度在DCP用量为0.1%时达最大值,分别提高30%和16%,拉伸性能变化不大,但冲击强度不断下降;高流动性GMT材料的力学性能较原基体增大10%～20%;在高流动性GMT中加入增韧剂后,保持其它性能不变的情况下冲击强度增大45%以上。

The molar mass of PP was adjusted by using peroxide （DCP）, the effect of DCP on the melt flow index （MFR） and mechanical properties of PP was studied, and high flowable GMT materials with high strength and toughness were prepared from this degradation products. The results showed the MFI of the PP matrix almost linearly increased with the increase of DCP content; when DCP content was 0. 1%, the flexural modulus and strength of the matrix reached its peak, increased by 30% and 16% respectively, while the tensile properties changed little and the impact strength decreased gradually; compared with the GMT materials made from the original matrix, the mechanical properties of the high flowable GMT materials increased by 10-20% ; after the tough-ener was compounded into the high flowable GMT materials, its impact strength increased by 45 %, with other mechanical properties kept unchanged.