| Kinetics and mechanism studies on scandium calix[6]arene complex initiating ring-opening polymerization of 2,2-dimethyltrimethylene carbonate |
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| 作者单位： | GOU PengFei（Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Institute of Polymer Science, Zhejiang University, Hangzhou 310027, China） ;
ZHU WeiPu（Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Institute of Polymer Science, Zhejiang University, Hangzhou 310027, China） ;
SHEN ZhiQuan（Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Institute of Polymer Science, Zhejiang University, Hangzhou 310027, China） ; |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划);浙江省科技厅科技计划 |
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| 摘 要： | Scandium p-tert-butylcalix6]arene complex has been synthesized from scandium isopropoxide and p-tert-butylcalix6]arene and used as a single component initiator for the first time. The polymerization of 2,2-dimethyltrimethylene carbonate (DTC) using this complex can proceed under mild conditions. Poly (2,2-dimethyltrimethylene carbonate) (PolyDTC) with weight-average molecular weight of 33700 and molecular weight distribution of 1.21 can be prepared. Kinetics study indicates that the polymeri- zation rate is first order with respect to both monomer and initiator concentrations, and the apparent activation energy of the polymerization is 22.7 kJ/mol. 1H NMR spectrum of the polymer reveals that the monomer ring opens via acyl-oxygen bond cleavage leading to an active center of Sc-O.
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| 收稿时间： | 27 May 2006 |
| 修稿时间： | 21 September 2006 |
Kinetics and mechanism studies on scandium calix[6]arene complex initiating ring-opening polymerization of 2,2-dimethyltrimethylene carbonate |
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| Authors: | Gou PengFei Zhu WeiPu Shen ZhiQuan |
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| Institution: | Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Institute of Polymer Science, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Scandium p-tert-butylcalix6]arene complex has been synthesized from scandium isopropoxide and p-tert-butylcalix6]arene and used as a single component initiator for the first time. The polymerization of 2,2-dimethyltrimethylene carbonate (DTC) using this complex can proceed under mild conditions. Poly (2,2-dimethyltrimethylene carbonate) (PolyDTC) with weight-average molecular weight of 33700 and molecular weight distribution of 1.21 can be prepared. Kinetics study indicates that the polymeri- zation rate is first order with respect to both monomer and initiator concentrations, and the apparent activation energy of the polymerization is 22.7 kJ/mol. 1H NMR spectrum of the polymer reveals that the monomer ring opens via acyl-oxygen bond cleavage leading to an active center of Sc-O. |
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| Keywords: | ring-opening polymerization scandium calixarene complex 2 2-dimethyltrimethylene carbonate (DTC) polycarbonates |
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