预辐射聚丙烯反应挤出接枝丙烯酸的研究  

Grafting Acrylic Acid onto Pre-irradiated Polypropylene by Reactive Extrusion

作　　者：蔡传伦[1] 辛志荣[2] 姚占海[1] 石强[1] 殷敬华[1] 

机构地区：[1]中国科学院长春应用化学研究所 [2]烟台大学化学生物理工学院,烟台264005

出　　处：《高等学校化学学报》2006年第10期1969-1973,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50390090)资助.

摘　　要：利用电子束(EB)预辐照方法和反应挤出技术制备了聚丙烯接枝丙烯酸共聚物PP-g-AA.采用化学滴定、红外光谱、偏光显微镜(PLM)、DSC和广角X射线衍射(WAXD)对接枝产物进行了表征.研究结果表明,接枝率随辐照剂量增加而增大并逐渐达到平台值,但随单体浓度增大而表现为线性增加,接枝链能起到异相成核作用,从而提高了结晶速率并细化了球晶.同时,熔体流动速率(MFR)和力学性能测试结果表明,预辐射和挤出过程造成了PP严重降解,据此可认为接枝反应主要发生在聚丙烯断裂分子链的末端.Polypropylene functionalized with acrylic acid （PP-g-AA） was prepared by coupling electron beam （EB） pre-irradiation treatment with reactive extrusion process. The grafting samples were characterized by chemical titration, FTIR, polarized light microphotographs, DSC and WAXD. The study showed that grafting degree（Gd） increased with increasing irradiation dose and then leveled off; the Gd increased linearly with the AA concentration rising. It was observed that crystallization temperature of the grafted sample increased and crystallite size decreased, which can be attributed to the heterogeneous nucleating action of grafting chain. The MFR and mechanical properties measurements proved that serious degrada pre-irradiation and extruding process. Meanwhile, a mechanism of grafting tion of PP occured in the stage of reactions was proposed tentatively.

关 键 词：聚丙烯 反应挤出 电子束预辐照 丙烯酸 

分 类 号：O631[理学—高分子化学]