Catalyst-transfer polycondensation for the synthesis of poly(p-phenylene) with controlled molecular weight and low polydispersity
Catalyst-transfer polycondensation for the synthesis of poly(p-phenylene) with controlled molecular weight and low polydispersity
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DOI：
10.1021/ja067107s
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发表时间：
2006-12-20
影响因子：
15
通讯作者：
Yokozawa, Tsutomu
中科院分区：
文献类型：
--
作者：
Miyakoshi, Ryo;Shimono, Kyohei;Yokozawa, Tsutomu
为了检验催化剂转移缩聚反应（可提供明确的聚噻吩）是否对其他共轭聚合物具有通用性，研究了使用各种镍催化剂合成聚（对亚苯基）（PPP）。单体1，1-溴-4-氯镁-2,5-二己氧基苯，在等摩尔LiCl存在下与Ni(dppe)Cl2聚合，得到具有窄多分散性的PPP。由此获得的PPP的数均分子量(Mn)与1的转化率成比例地增加，表明该聚合也是以链增长聚合方式进行的。此外，PPP的分子量通过1与Ni催化剂的进料比控制，至少Mn= 30000。
To examine whether catalyst-transfer polycondensation, which affords well-defined polythiophenes, has generality for other conjugated polymers, the synthesis of poly(p-phenylene) (PPP) with various Ni catalysts was investigated. Monomer1, 1-bromo-4-chloromagnesio-2,5-dihexyloxybenzene, was polymerized with Ni(dppe)Cl2in the presence of equimolar LiCl to give PPP with a narrow polydispersity. The number-average molecular weight (Mn) of PPP thus obtained increased in proportion to the conversion of1, indicating that this polymerization also proceeded in a chain-growth polymerization manner. Furthermore, the molecular weight of PPP was controlled by the feed ratio of1to the Ni catalyst up to at leastMn= 30000.