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Synthesis and characteristics of a novel aliphatic polycarbonate, poly[(propylene oxide)‐co‐(carbon dioxide)‐co‐(‐butyrolactone)]

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A novel aliphatic polycarbonate, poly[(propylene oxide)‐co‐(carbon dioxide)‐co‐(‐butyrolactone)] [P(PO—CO2—GBL)], was synthesized by the copolymerization of carbon dioxide, propylene oxide (PO) and ‐butyrolactone (GBL). The resulting copolymers were determined by FTIR and NMR spectral analysis with viscosity‐average molecular weights (Mv) from 50 000 to 120 000 g mol−1. According to elemental analysis, the calculated data of elemental contents in P(PO—CO2—GBL)44 were close to the found data. The result showed that GBL was inserted into the backbone of poly[(propylene oxide)‐co‐(carbon dioxide)] successfully. GBL offered an ester structural unit that gave the copolymer better degradability. The correlations between reaction conditions and properties were studied. When GBL content increased, the Mv and the glass transition temperature (Tg) of the copolymers improved relative to an identical copolymer without GBL. Prolonging the reaction time of the copolymerization resulted in increases in Mv and Tg. P(PO—CO2—GBL) exhibited a high Tg above 40 °C. The rate of backbone degradation increased with increasing GBL content. Copyright © 2005 Society of Chemical Industry
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Keywords: aliphatic polycarbonate; carbon dioxide; degradable; poly[(propylene oxide)‐co‐(carbon dioxide)‐co‐(‐butyrolactone)]; propylene oxide; ‐butyrolactone

Document Type: Research Article

Affiliations: School of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China

Publication date: 2005-06-01

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