Polymeric end-capping reagent for carbon dioxide-epoxide copolymers and a method for preparing the same
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United States of America Patent
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Issued Date -
May 24, 2007
app pub date -
Oct 31, 2006
filing date -
Nov 21, 2005
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Abandoned
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Abstract
The invention relates to a polymeric end-capping reagent for carbon dioxide-epoxide copolymers and a method for producing the same. The polymeric end-capping reagents provided by the invention are maleic anhydride copolymers and maleic anhydride terpolymers. The polymeric end-capping reagent for carbon dioxide-propylene oxide copolymers of the invention is produced by a radical solution copolymerization method, and has a number average molecular weight of M.sub.n=4-6.times.10.sup.4, a distribution index of 1.5-3.0. By using the polymeric end-capping reagent provided by the invention, the disadvantages of the small molecular end-capping reagent like volatilization during melting and precipitation on the melt surface during cooling, can be effectively overcome, moreover, the initial thermal decomposition temperatures of the carbon dioxide-propylene oxide copolymers end-capped with the polymeric end-capping reagents increase by about 30.degree. C., as compared with that of the carbon dioxide-propylene oxide copolymer end-capped with 'small molecular' maleic anhydride.
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