Bismuth-Triflate-Catalyzed Polymerizations of ε-Caprolactone

被引:16
作者
Lahcini, Mohammed [2 ]
Qayouh, Hicham [1 ,2 ]
Yashiro, Takao [1 ,3 ]
Weidner, Steffen M. [4 ]
Kricheldorf, Hans R. [1 ]
机构
[1] Inst Tech & Makromol Chem, D-20146 Hamburg, Germany
[2] Univ Cadi Ayyad, Fac Sci & Tech Marrakech, Lab Chim Bioorgan & Macromol, Marrakech 40000, Morocco
[3] JSR Corp, Tsukuba, Ibaraki 3050841, Japan
[4] Bundesanstalt Mat Forsch, D-42489 Berlin, Germany
关键词
bismuth; epsilon-caprolactone; ring-opening polymerization; telechelic polyesters; RING-OPENING POLYMERIZATION; L-LACTIDE; ALIPHATIC POLYESTERS; CATIONIC-POLYMERIZATION; INITIATED POLYMERIZATIONS; DICARBOXYLIC-ACIDS; L-LACTATE; POLYLACTONES; MECHANISM; KINETICS;
D O I
10.1002/macp.201000517
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
epsilon CL was polymerized using the triflates of lanthanum, samarium, magnesium, aluminum, scandium, and bismuth as catalysts. Bismuth triflate proved to be extraordinarily reactive, and catalyzed polymerizations of eCL even at 20 degrees C. Adding DTBMP reduced the polymerization rate only slightly. Furthermore, no evidence of a cationic mechanism was found by end-group analyses. Polymerization at 20 degrees C either in bulk or in solution only yielded polyesters of low or medium molecular weights ((M) over bar (n) up to 30 000 Da). Yet addition of alcohols allowed for a proper control of molecular weight and end-groups. Additionally, low catalyst concentrations and low temperature resulted in narrow molecular weight distributions and polylactones almost free of cyclic compounds.
引用
收藏
页码:583 / 591
页数:9
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