一种新型单体引发转移终止剂合成精细结构功能化的聚苯乙烯

自从1982年Ｏｔｓｕ[1]等提出引发转移终止剂(Ｉｎｉｆｅｒｔｅｒ)以来,这类化合物得到了广泛的研究和发展.使用引发转移终止剂的聚合反应是实现“活性”聚合的一个重要方法.引发转移终止剂又分为热引发转移终止剂和光引发转移终止剂两种.热引发转移终止剂除了三苯甲基偶氮苯外[2],均是六取代乙烷类化合物[3～7];而光引发转移终止剂则一般是一些含二硫代氨基甲酰氧基基团的化合物,如Ｎ,Ｎ二乙基二硫代氨基甲酸苄酯(ＢＤＣ)、双(Ｎ,Ｎ二乙基二硫代氨基甲酸)对苯二甲酯(ＸＤＣ)、Ｎ乙基二硫代氨基甲酸苄酯(ＢＥＤＣ)、双(Ｎ乙基二硫代氨基甲酸…

SYNTHESIS OF WELL-DEFINED FUNCTIONALIZED POLYSTYRENE BY A NEW MONOMER INIFERTER

A new monomer-iniferter,allyl 2- N,N- diethyldithiocarbamylacetate (ADCA),was synthesized from allyl alcohol with chloroacetyl chloride then the chlorine groups were subsequently reacted with sodium diethyldithiocarbamate. The ADCA was used for preparation of well|defined functionalized polystyrene via radical polymerization of styrene (St) in bulk under UV light irradiation at ambient temperature. The bulk polymerization of St with ADCA proceeded a “living" process, i.e., both the yield and molecular weight of the resultant PSt increased with the increasing of reaction time, and the average number of end group Et 2NCSS is about 1. The well|defined polymer was characterized by 1 H|NMR and FT IR spectroscopies to be an α-allyloxycarbonylmethylene-ω-diethyldithiocarbamyl-polystyrene.Under UV light irradiation,the C-S bond of -ω-end groups of PSt can cleavage reversibly to initiate MMA polymerization forming a well|defined PSt-b-PMMA copolymer.