自由基/正离子转化聚合法合成对甲氧基苯乙烯与环己烯氧化物/1,2,5,6-二环氧基环辛烷的嵌段共聚物

BLOCK COPOLYMER SYNTHESIS OF para -METHOXYSTYRENE AND CYCLOHEXENE OXIDE AND 1,2,5,6-DIEPOXYCYCLOOCTANE BY RADICAL/CATION TRANSFORMATION POLYMERIZATION

用自由基 /正离子转化聚合法 ,由对甲氧基苯乙烯、环己烯氧化物、1,2 ,5 ,6 二环氧基环辛烷体系一步法合成了它们的嵌段共聚物 .其中 ,聚对甲氧基苯乙烯构成自由基聚合链段 ,而环己烯氧化物与 1,2 ,5 ,6 二环氧基环辛烷的共聚物构成正离子聚合链段 .实验结果初步表明 ,1,2 ,5 ,6

Active center transformation polymerization from a radical to a cationic mechanism of paramethoxystyrene (MOS) was performed by using 2, 2'-azoisobutyronitrile (AIBN) as a radical initiator and diphenyliodoniuin hexafluorophosphate (Ph2I+PF6-) as an electron acceptor. Block copolymers of poly (MOS-b-CHO/DECO) were prepared by one step by adding monomer cyclohexene oxide(CHO) and bifunctional monomer 1,2,5, 6-diepoxycyclooctane (DECO) to the above system. Using bifunctional monomer DECO successfully eliminated homopolymers formed by chain transfer reaction during cationic polymerization. The polymers obtained by the system containing MOS, CHO, AIBN, Ph2I+PF6- and DECO were characterized by H-1-NMR, extraction separation, and gel permeation chromatography (GPC), etc. Neither homopolymer of PCHO nor copolymers of CHO and DECO (poly(CHO-co-DECO)) were obtained by this system, suggesting the success and the efficiency of the method.