有机/无机纳米杂化材料载体化钛催化剂的聚合研究 Ⅱ.间同聚苯乙烯制备

Study on the Polymerization with Organic/Inorganic Hybrid-Supported Titanium Catalysts Ⅱ.Styrene Polymerizaton

以苯乙烯 -马来酸酐无规共聚物 ( SMA)为有机组分 ,以正硅酸乙酯 ( TEOS)为无机组分 ,利用 sol-gel方法制得纳米杂化材料 .以此为载体合成了载体化钛系催化剂 ,进行了苯乙烯聚合的研究 .聚合结果表明在50℃左右聚苯乙烯的间规度达到最大 ;随着反应温度的提高 ,分子量出现了下降现象 ,但反应活性提高 ,在70℃时 ,可达最高 1 .4 9× 1 0 6 g/( mol·h) ;并且分子量分布与文献结果相比也较宽 .

The use of organic/inorganic hybrid materials poly(styrene co maleic anhydride)/SiO 2 as the support for titanium catalysts in styrene polymerization was studied. Results indicated that at 70 ℃ the activity of the inorganic/organic hybrid supported catalysts would reached a maximum; 1 49× 10 6 g/(mol·h). With increase in reaction temperature, the molecular weight of polymer decreased, and the polydispersity was much wider. DSC and FTIR measurements showed that the product was syndiotatic polystyrene. [WT5HZ]