超临界CO_2中PP与MAA的接枝反应

Grafting of Methyl Acrylic Acid onto PP in Supercritical Carbon Dioxide

利用超临界CO2作为甲基丙烯酸(MAA)的溶剂和聚丙烯(PP)的溶胀剂,合成了MAA与PP的接枝聚合物 (PP-g-MAA)。考察了单体浓度、引发剂用量、反应压力、反应时间等反应条件对接枝率的影响。结果表明:在合适的反应条件下,MAA的接枝率最高可达14．6％,而且接枝后PP颗粒的外观可以保持不变。用FT-IR、DSC以及SEM 等方法对样品进行了表征。DSC曲线发现PP-g-MAA有两个熔融峰。SEM观察发现PP-g-MAA的表面比PP表面明显粗糙。

Polypropylene （PP） was swelled with a solution of methyl acrylic acid （MAA） in supercritical CO2 and was grafted with MAA via free radical polymerization leading to PP-g-MAA, with a maximum grafting degree of 14.6 % being achieved. The effects of reaction conditions, monomer concentration, initiator concentration, supercritical CO2 pressure and reaction time on grafting ratio were studied using FT-IR and DSC. DSC showed two melting peaks. SEM revealed that surface of PP-g-MAA was coarser than that of PP.