Ring-opening polymerization of ε-caprolactone in supercritical carbon dioxide

被引：74
|
作者：
Stassin, F [1 ]
Halleux, O [1 ]
Jérôme, R [1 ]
机构：
[1] Univ Liege, CERM, B-4000 Liege, Belgium
来源：
MACROMOLECULES | 2001年 / 34卷 / 04期
关键词：
D O I：
10.1021/ma001252n
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The ring-opening polymerization of epsilon -caprolactone (CL) initiated by dibutyltin dimethoxide was studied in supercritical carbon dioxide at 40 degreesC, under a pressure of 210-215 bar. The polymerization is controlled as assessed by the linear dependence of M-n,M-SEC On conversion and of In([CL](0)/[CL]) on time. Moreover. there is a good agreement between M-n,M-SEC and M-n,M-calc, at least until 20 000 g/mol. The apparent rate constants of polymerization in different media increase as follows: sc CO2, CFC-113, toluene, bulk. The kinetic order in initiator for the polymerization in solution and in sc CO:! was extracted from the slope of In k(app) vs In [Sn](0). It appears to depend on the initiator concentration in solution, which is not the case in sc CO2.
引用
收藏
页码：775 / 781
页数：7
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