期刊
EUROPEAN POLYMER JOURNAL
卷 47, 期 11, 页码 2152-2157出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2011.08.004
关键词
Poly(propylene carbonate); Copolymerization; Carbon dioxide; Double metal cyanide complex; Air stability
资金
- Natural Science Foundation of China [20634040, 50903084, 51021003]
High-molecular-weight poly(propylene carbonate) (PPC) was synthesized using a Zn-Co-based double metal cyanide (Co-DMC) catalyst. The catalytic activity reached as high as 60.6 kg polymer/g Co-DMC after 10 h when the low-molecular-weight polyether polyol initiator was not used. In contrast, production of the by-product propylene carbonate (PC) significantly decreased to below 1.0 wt%. Considering the carbonate content in the alternative copolymer as 100%, the carbonate content of the obtained PPC ranged between 34% and 49%. The carbonate content was highly important for the air stability of PPC. The number average molecular weight of the as-polymerized PPC with a carbonate content of 48% reached 130 kg/mol. However, it decreased to ca. 60 kg/mol after 24 h of storage at 70 C, and further dropped to ca. 40 kg/mol after 7 d. This result confirmed that severe oxidative degradation occurred for the low-carbonate-content PPC. Air stability significantly improved by adding antioxidant 1010 (tetrakisl methylene(3,5-di-(tert-butyl)-4-hydroxy-hydro cinnamate)] methane). Similarly, a more air stable PPC was also prepared by raising its carbonate content. Our work provided a new explanation on the wide existence of low-molecular-weight PPC in DMC catalyst literature. Strategies for obtaining high-molecular-weight PPC were also disclosed. (C) 2011 Elsevier Ltd. All rights reserved.
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