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Qijin ZHANG , Wenying XU , and Zhiyong WANG (Dept. of Mater. Sci. & Eng. , University of Science and Technology of China , Hefei , 230026 , China)(To whom correspondence should be addressed)(Dept. of Modern Chemistry , University of Science and Technology of Ch
材料科学技术（英文）
At 225℃. caprolactone has been polymerized in the presence of succinic acid under dry nitrogen atmosphere. Characterizations of the polymer through IR and molecular weight measurements by 1H-NMR and end group titration have shown that the polycaprolactone obtained is of two carboxyl end groups. The molecular weight of it increases with decreasing of the acid content in the reaction mixture under the same polymerization conditions. With a certain ratio of acid to caprolactone. the maximum of molecular weight of the polymer will be reached at the reaction time of 3h.
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