负载钛-三乙基铝体系催化异戊二烯聚合  被引量:4

Polymerizaton of isoprene in the presence of supported titanium catalyst and Al(Et)_3

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作  者:胡婧[1] 柏林 刘庆华 邵华锋[1] 姚薇[1] 黄宝琛[1] 

机构地区:[1]青岛科技大学橡塑材料与工程教育部重点实验室,山东青岛266042 [2]建大橡胶(中国)有限公司技术部,江苏昆山215333

出  处:《弹性体》2010年第1期30-33,共4页China Elastomerics

基  金:国家科技型中小企业技术创新基金(07G26213711615)

摘  要:以负载钵(TiCl4/MgCl2)为主催化剂、三乙基铝为助催化剂催化异戊二烯聚合,研究了n(Ti)/n(Ip)、n(Al)/n(Ti)及温度等对单体转化率和催化效率的影响。采用FTIR和^1H—NMR对聚合产物的微观结构进行测试表征,DSC测定聚合产物的熔点和结晶度。结果表明,所得聚合产物为反式-1,4-结构摩尔分数达98%的异戊橡胶;聚合体系的单体转化率随n(Ti)/n(Ip)的增大而升高,催化效率则先升高后降低;随n(Al)/n(Ti)和聚合温度的增大,催化效率和单体转化率均先升高后降低,最佳n(Al)/n(Ti)值为110~120,最佳聚合温度为20-25℃。The polyisoprene was synthesized with TiCl4/MgCl2 catalyst and Al(Et)3 cocatalyst. The effect of n(Ti)/n(Ip),n(Al)/n(Ti) and polymerization temperature was studied. The structure of polyisoprene was characterized with IR and ^1H-NMR. The melting points and crystallinity degree were determined by DSC. The results showed that the mass fraction of 1,4-unit in the polyisoprene was 98 %. The conversion increased with the raise of n (Ti)/n(Ip). The catalytic efficiency inceased at first and then decreased with the raise of n(Ti)/n(Ip). The conversion and catalytic efficiency inceased at first and then decreased with the raise of n (Al)/n (Ti) and temperature. The optimum condition of polymerization was n(Al)/n(Ti) 110-120,temperature 20 ℃.

关 键 词:负载钛催化剂 三乙基铝 异戊二烯 结构表征 

分 类 号:TQ325.1[化学工程—合成树脂塑料工业]

 

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