Conversion-time curves in the diffusion-controlled free radical polymerization of styrene |
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| Institution: | 1. Environment Research Institute, Shandong University, Jinan, 250100, PR China;2. College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China;1. London Centre for Nanotechnology, Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;2. London Centre for Nanotechnology, Department of Materials, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;1. School of Environment and Safety Engineering Changzhou University, Changzhou, 213164, Jiangsu, China;2. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China;3. Institute of Industry and Trade Measurement Technology, College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, China;4. Zhejiang Engineering Laboratory of Chemicals Safety Testing Technology and Instruments, Hangzhou, China;1. Laboratoire de Nutrition et Pharmacologie, UFR Biosciences, Université Felix Houphouët Boigny de Cocody-Abidjan, 22, BP 582 Abidjan 22, Cote d’Ivoire;2. LAPISEN, Groupe de recherche en Chimie des Eaux et des Substances Naturelles, Institut National Polytechnique Houphouët Boigny, BP 1313 Yamoussoukro, Cote d’Ivoire;3. CNRS, UPMC, LBBM, Observatoire Océanologique, 66650 Banyuls-sur-Mer, France;4. Laboratoire de Chimie Organique, UFR Sciences des Structures de la Matière et de Technologie, Université Felix Houphouet Boigny, 22, BP 582 Abidjan 22, Cote d’Ivoire;5. L3MA, UMR Ecologie des Forêts de Guyane, Université des Antilles et de Guyane, Campus de Troubiran, 97300 Cayenne, France;6. AM2N, Institut Charles Gerhardt, UMR 5253, ENSCM, 8 rue de l’Ecole Normale, 34296 Montpelier, France;7. CIRAD, Département Environnements et Sociétés, UMR Ecologie des Forêts de Guyane, BP 732, 97310 Kourou cedex, France |
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| Abstract: | In order to calculate conversion-time curve in radical polymerization, the termination rate constant for interacting polymer radicals with chain lengths n and s is written as: kt,ns = k(ζn + ζs) where k ∝ exp(−0.40/vf) (vf: free volume), and ζ = 1 at n ⩽ nc and ζ = (nc/n)1,5 at n ⩾ nc + 1 (nc: a critical chain length of polymer moving by reptation). The curves are applicable to the experimental data obtained from 20°C to 154°C in the thermal polymerization of styrene. Further, it is shown that the curves can be applied to the experimental data for polymerization in the presence of initiator. |
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