引发转移终止剂技术合成含有聚异戊二烯链段的三嵌段共聚物

含聚异戊二烯 (ＰＩＰ)链段的嵌段共聚物有着广泛的应用1～ 3 ] ,有关它的合成、性能表征及应用方面的研究一直是学术及工业界的研究热点 .传统上 ,含有ＰＩＰ链段的嵌段共聚物用活性负离子聚合的方法来合成 ,例如 :聚苯乙烯 聚异戊二烯嵌段共聚物3 ,4 ] .这是由聚合物增长链端的特殊活性所决定的 ,采用活性负离子聚合方法 ,不但能很好地控制共聚物的分子量和分子量分布 ,而且能控制共聚物中各组分的比例 .但是 ,负离子聚合通常需在较苛刻的条件下进行 ,如低温高真空、高纯度的单体和溶剂 ,而且能用于负离子聚合的单体也有限 .相对而言 ,…

SYNTHESIS OF TRIBLOCK COPOLYMERS CONTAINING POLYISOPRENE SEGMENTS USING INIFERTER TECHNIQUE

ABA triblock copolymers containing polyisoprene segments,such as polyisoprene b polystyrene b polyisoprene (PIP b PSt b PIP)and polyisoprene b poly(methyl methacrylate) b polyisoprene(PIP b PMMA b PIP),were prepared with macro iniferter technique.The macro iniferters (PSt CCDCM and PMMA CCDCM)bearing α and ω N,N diethyldithiocarbamyl (DC)groups were synthesized by bulk polymerization of St and MMA with diethyl 2,3 dicyano 2,3 di( p N,N diethyldithiocarbamylmethyl) phenylsuccinate (DDDCS) as a thermal iniferter.The block copolymerization of IP with PSt CCDCM or PMMA CCDCM was carried out under UV light irradiation.The block copolymers were characterized by 1H NMR,GPC and DSC analyses,and the polymerization proceeded as a living polymerization process.