PP/EPDM共混体系的辐射效应  

Effects of PP/EPDM Blends Irradiated by γ-Rays

作　　者：宋春雷[1] 那天海[1] 于力[1] 于黎[1] 张利华[1] 莫志深[1] 

机构地区：[1]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室,长春130022

出　　处：《功能高分子学报》2004年第4期557-560,共4页Journal of Functional Polymers

基　　金：吉林省科学技术厅应用基础研究项目(20020629)

摘　　要：聚丙烯和三元乙丙橡胶(EPDM)的γ辐射效应及辐射后的聚丙烯熔体流动速率的测定表明,在限 定空气中聚丙烯随着辐照剂量的增加,熔体流动速率急剧下降,而三元乙丙橡胶随辐射剂量的增加,凝胶含量 逐渐增加。在20kGy的剂量辐照下,凝胶含量为22.7％,加入2％的三聚异氰酸三烯丙酯,在相同的剂量辐 照下,凝胶含量达到68％。在低剂量下辐照对共混物的拉伸强度影响不大,对冲击强度有很大的影响。在20 kGy的剂量辐照下,加入50％EPDM的聚丙烯的缺口冲击强度由1.95 kJ／m2提高到30 kJ／m2,维卡软化温度 由85.9℃提高到97.0℃。Improvement of the impact properties of PP can be achieved by the dispersion of elastomers in the PP matrix. In the field of PP/EPDM blends, most studies have been performed on improving the mechanical properties via dynamically vulcanized blends. The present work reports the results of irradiating PP and EPDM, a large decrease in melt flow rate is observed for PP, EPDM is easily crosslinked by γ-rays in air at room temperature. At low dose range radiation crosslinking of EPDM is enhanced due to the addition of TAIC. The radiation crosslinked EPDM containing 68% gel was obtained with the addition of 2% TAIC by 20kGy dose. From the above, radiation crosslinking of polymer blends containing PP and EPDM was studied. The impact of PP with 50% EPDM is increased by γ-irradiation from 1. 95kJ/m2 to 30 kJ/m2 in 20 kGy dose, the Vicat softening temperature is also increased from 85. 9℃ to 97℃. In this case, both crosslinking of EPDM phase and chain scission of PP phase played an important role, causing a more complex mechanical behavior.

关 键 词：凝胶含量 熔体流动速率 EPDM 聚丙烯 三元乙丙橡胶 共混体系 缺口冲击强度 低剂量 辐照 辐射剂量 

分 类 号：O631[理学—高分子化学] TQ325[理学—化学]