一种新的阳离子引发剂,即4-乙烯基苯甲酸2-甲基硫烷基-4,5-二氢恶唑啉-4-基甲基酯三氟甲磺酸酯(1),通过1,3-恶唑烷-2的反应以定量收率合成,同时带有乙烯基和三氟甲磺酸酯基。 -硫酮衍生物与三氟甲磺酸甲酯。以1为引发剂,在二氯甲烷中进行衍生于l-丝氨酸的光学活性环状硫代氨基甲酸酯(S L)的活性阳离子开环聚合反应,得到相应的大分子单体(MS L ; M n > 10 4,M w /中号ñ<1.18),MS L的分子量可以通过[ S L ] / [ 1 ]进行控制。MS L在起始端定量地由光学活性的硫代氨基甲酸酯主链和苯乙烯基组成。进行MS L的自由基均聚和与苯乙烯的共聚以获得更高收率的相应聚合物。从所得到的聚合物MS大号显示出更高的比旋光度([α] 25 d),熔点(Ť米),和Cotton效应比MS大号,支持接枝的聚(S L)侧链的稳定二级结构。
Living cationic ring-opening polymerization by water-stable initiator: synthesis of a well-defined optically active polythiourethaneElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b310735c/
Method of producing a polythiourethane and method of producing a graft polymer
申请人:Nagai Atsushi
公开号:US20050250926A1
公开(公告)日:2005-11-10
A polythiourethane is produced by polymerizing a compound represented by formula (I) in the presence of a compound represented by formula (II)
in which R
1
represents a methyl group;