Kinetics study of Ti[O(CH2)4OCHCH2]4 initiated ring‐opening polymerization of ε‐caprolactone by differential scanning calorimetry |
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| Authors: | Peichun Li Amar Zerroukhi Jianding Chen Yvan Chalamet Thomas Jeanmaire Zhean Xia |
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| Affiliation: | 1. Ingénierie des Matériaux Polymères/LRMP, UMR CNRS 5223, Université Jean Monnet, 23 rue du Dr Paul Michelon 42023, Saint‐Etienne, Cedex 2, France;2. Institute of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China |
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| Abstract: | Chemical shrinkage was used for the in situ measurement of the progressing chemical stabilization reactions and the influence of ozone during the stabilization of polyacrylonitrile. A method for evaluating the activation energy through the sensitivity temperature is presented. The calculated results show that the activation energies were 161.57 kJ/mol in air and 181.23 kJ/mol in ozone-enriched air. Therefore, the chemical reactions were postponed during stabilization in ozone-enriched air. Ozone seemed to act in three ways: first, ozone promoted the formation of the serious skin–core structure. Second, ozone accelerated the chemical reactions and shortened the stabilization time at lower heating rates. Third, ozone postponed the chemical reactions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008 |
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| Keywords: | titanium alkoxide ε ‐caprolactone ring‐opening polymerization kinetics (polym.) differential scanning calorimetry (DSC) |
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