聚四氟乙烯接枝GMA的反应研究

Reaction of Polytetrafluoroethylene Grafted GMA

使用叔丁基锂(t-BuLi)与乙二胺(EDA)的混合溶液活化聚四氟乙烯(PTFE),并在活化的PTFE上接枝甲基丙烯酸缩水甘油酯(GMA)。使用傅立叶红外吸收光谱(FTIR)对活化与接枝后的PTFE进行了分析,结果表明:本工艺成功将GMA接枝到PTFE上。通过扫描电子显微镜(SEM)观察了接枝表面,使用TGA法测定接枝聚合物的接枝率达到5.83%。最后研究了接枝反应时间和温度对PTFE-g-GMA接枝率的影响。结果表明,接枝率随着反应时间的延长逐渐增加,反应时间超过8h后基本恒定;在70℃反应时接枝率出现最大值。

Polytetrafluoroethylene （PTFE） was activated with the mixture solution of tert-Butyllithium （t-BuLi） and ethylenediamine （ EDA）, and grafted GMA onto the PTFE. The chemical structure of activated and grafted PTFE was analyzed by using FTIR. It shows that GMA was successfully grafted onto the PTFE. SEM was used to observe the surface morphology of grafted PTFE. The grafting ratio of 5.83% was achieved, which was measured by TGA. The effect of reaction time and temperature for the grafting ratio was studied fially. The grafting ratio was increased with the elongation of reactive time, and basically constant after 8h. The grafting ratio reaches its maximum when the reaction temperature is 70℃.