کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188790 | 1381169 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Double propagation based on diepoxide, a facile route to high molecular weight poly(propylene carbonate)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Poly(propylene carbonate) (PPC) with number average molecular weight (Mn) higher than 200 kg/mol was prepared via the terpolymerization of carbon dioxide, propylene oxide and diepoxide using Y(CCl3OO)3-ZnEt2-glycerine coordination catalyst. When equimolar ZnEt2 and diepoxide were used, double propagation active species were generated in situ by nucleophilic attack of metal alkoxide on diepoxide, leading to PPC of doubled Mn value. The molecular weight of PPC has dramatic influence on its thermal and mechanical performances. PPC with Mn of 227 kg/mol showed modulus of 6900 MPa, while the modulus of PPC with Mn of 109 kg/mol was only 4300 MPa. Moreover, when Mn increased from 109 to 227 kg/mol, a 37 °C increase of the onset degradation temperature was observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 21, 4 October 2006, Pages 7368-7373
Journal: Polymer - Volume 47, Issue 21, 4 October 2006, Pages 7368-7373
نویسندگان
Youhua Tao, Xianhong Wang, Xiaojiang Zhao, Ji Li, Fosong Wang,