Living polymerization of 1-chloro-1-alkynes catalyzed by MoCl5-n-Bu4Sn-EtOH
Living polymerization of 1-chloro-1-alkynes catalyzed by MoCl5-n-Bu4Sn-EtOH
复制标题
MoCl5-n-Bu4Sn-EtOH催化1-氯-1-炔的活性聚合
DOI：
10.1021/ma00185a002
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
T. Higashimura
中科院分区：
文献类型：
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作者：
Toshio Yoshimura;T. Masuda;T. Higashimura
1-氯-L-辛炔(CLG、C-RC-CgH_(13))在MoC_(16)、正丁锡和乙醇(摩尔比为1：1：0.5)的混合物催化下聚合，得到了相对分子质量分布较窄的聚合物(Me/Mn=1.1~1.3)。聚合物的数均相对分子质量(Mn)与转化率成正比，在聚合体系中加入新单体后，数均相对分子质量进一步增加。繁殖物种与Mo催化剂的比例很小(0.017)。其他1-氯-L-炔(C1C=CR；R=n-C4H9、72-C8H17和ra-C^H^)形成了具有类似窄分子量分布的聚合物。因此，目前的聚合反应表明存在一个长寿命的繁殖物种，尽管还不完善，但它是乙炔单体活性聚合的第一个明显例子。
Polymerization of 1-chloro-l-octyne (ClG^ C-rc-CgH13) catalyzed by a mixture of MoC16, n-Bu4Sn, and EtOH (molar ratio 1: 1: 0.5) produced a polymer with a narrow molecular weight distribution (MWD; Me/Mn= 1.1-1.3). The number-average molecular weight (Mn) of the polymer increased in direct proportion to conversion and further increased on addition of a new monomer feed to the polymerization system. The ratio of the propagating species to the Mo catalyst was rather small (0.017). Other 1-chloro-l-alkynes (C1C= CR; R= n-C4H9, 72-C8H17, and ra-C^ H^) formed polymers with similarly narrow MWDs. Thus, the present polymerization indicates the presence of a long-lived propagating species and, though yet imperfect, is the first clear example of living polymerization of acetylenic monomers.