【摘要】 合成了八甲基环四硅氧烷的一氯取代物,并以其为单体,98%浓硫酸为催化剂,采用称重法研究了一氯代八甲基环四硅氧烷阳离子开环的本体聚合动力学,探讨了温度,催化剂浓度对其聚合速率常数的影响.研究表明:温度,催化剂浓度对一氯代八甲基环四硅氧烷的聚合速率有显著影响,其聚合活化能是40.37kJ.mol-1;与八甲基环四硅氧烷阳离子开环聚合相比,氯代甲基使硅氧烷的开环聚合速率减慢,聚合活化能升高.更多还原

【Abstract】 The bulk polymerization kinetics of monochloro-octamethylcyclotetrasiloxane monomer was investigated by means of weight method. The effects of temperature and catalyst concentration on the polymerization rate were studied. The results show that the polymerization rate increases with increasing of temperature and catalyst concentration, and the activation energy is calculated out to be 40.37 kJ·mol-1. Compared with the octamethylcyclotetrasiloxane (D4) cationic ring-open polymerization,the activation energy of momochloro-octamethylcyclotetrasiloxane is higher,so its polymerization rate is lowered.更多还原