1,3-戊二烯阳离子聚合引发体系(CH3)3SiCl/EtAlCl2的研究

研究了阳离子引发体系Ｍｅ３ＳｉＣｌ（ＴＭＳＣｌ）ＥｔＡｌＣＬ２在正己烷中引发的１，３－戊二烯（ＰＤ）聚合反应。研究结果表明，在ＥｔＡｌＣｌ２引发的ＰＤ聚合反应中引入ＴＭＳＣｌ后大幅主提高了聚合物产率，同时使聚合反应速率明显提高，在「ＴＭＳＣｌ」／「ＥｔＡｌＣｌ２２」＝０－１范围内，ＴＭＳＣｌ／ＥｔＡｌＣｌ２体系制备的聚合物分子量高于ＥｔＡｌＣｌ２引发制备的聚合物，这些结果表明Ｍｅ３ＳｉＣｌ／ＥｔＡ

Me3SiCl/EtAlCl2 INITIATING SYSTEM FOR CATIONIC POLYMERIZATION OF 1,3-PENTADIENE

Cationic polymerizations of 1,3 pentadiene(PD) by Me 3SiCl(TMSCl)/EtAlCl 2 initiating system were studied. By the introduction of TMSCl, the polymer yield prepared by EtAlCl 2 is greatly increased, and the polymerization rate of TMSCl/EtAlCl 2 system is 6 times higher than that of EtAlCl 2. The molecular weight of the polymer is also raised by adding TMSCl and shows a maximum in the range of TMSCl]/EtAlCl 2]=0~1. These observations indicate that TMSCl/EtAlCl 2 initiating system has an higher activity for cationic polymerization of PD than EtAlCl 2 alone. 1H NMR results show that the polymerization is indeed initiatied by EtAlCl 2 in combination with HCl resulting from hydrolysis of TMSCl by adventitious water.