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首页> 外文期刊>Journal of Applied Polymer Science >RING-OPENING POLYMERIZATION OF EPSILON-CAPROLACTONE INITIATED BY RARE EARTH COMPLEX CATALYSTS
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RING-OPENING POLYMERIZATION OF EPSILON-CAPROLACTONE INITIATED BY RARE EARTH COMPLEX CATALYSTS

机译：稀土复杂催化剂引发的ε-己内酯开环聚合

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The polymerization of caprolactone (epsilon-CL) was initiated by yttrium triisopropoxide {Y(OPri)(3)} bimetallic isopropoxide of yttrium and aluminum {Y[Al(OPsi)(4)](3)}, yttrium and tin(II) {Y[Sn(OPri)(3)](3)}, and tin(II) and yttrium {Sn[Y(OPri)(4)](3)}, respectively. The polymerization was carried out through coordinative insertion of a monomer into the free metal-oxygen bond. The molecular weight and yield of poly(epsilon-caprolactone) (PCL) were affected drastically by the mol % of the initiator to the monomer (C-o/M-o). The results showed that Y(OPri)(3) and Sn[Y(OPri)(4)](2) were more effective than were {Y[Al(OPri)(4)](3)} and {Y[Sn(OPri)(3)](3)} for the polymerization of epsilon-CL. When polymerization was conducted at 5 degrees C using Y(OPri)(3) as the initiator or at 10 degrees C using Sn[Y(OPri)(4)](4) as the initiator, polymers with a molecular weight of 45.9 x 10(3) or 54.0 x 10(3) and high yield resulted in 30 or 5 min, respectively. The polymer was characterized by FTIR, H-NMR, and GPC. (C) 1997 John Wiley & Sons, Inc. [References: 26]
机译：己内酯（ε-CL）的聚合反应由钇和异丙醇铝（Y [Al（OPsi）（4）]（3）}，钇和锡（II）的三异丙氧基钇（Y（OPri）（3）}双金属异丙醇引发）{Y [Sn（OPri）（3）]（3）}和锡（II）和钇{Sn [Y（OPri）（4）]（3）}。通过将单体配位插入自由金属-氧键中进行聚合。聚（ε-己内酯）（PCL）的分子量和产率受引发剂相对于单体（C-o / M-o）的摩尔％的影响很大。结果表明，Y（OPri）（3）和Sn [Y（OPri）（4）]（2）比{Y [Al（OPri）（4）]（3）}和{Y [Sn （OPri）（3）]（3）}用于ε-CL的聚合。当使用Y（OPri）（3）作为引发剂在5摄氏度下或使用Sn [Y（OPri）（4）]（4）作为引发剂在10摄氏度下进行聚合时，分子量为45.9 x的聚合物10（3）或54.0 x 10（3），高产量分别导致30或5分钟。通过FTIR，1 H-NMR和GPC表征该聚合物。 （C）1997 John Wiley＆Sons，Inc. [参考：26]

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