A method for determining reactivity ratios in copolymerizations in the presence of a ceiling temperature effect |
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| Affiliation: | 1. College of Science, Engineering and Technology, University of South Africa, Johannesburg, 1710, South Africa;2. School of Chemical Engineering, Yeungnam University, Gyeongsan, 712749, South Korea;3. Al Azhar University-Gaza, Chemistry Department, Faculty of Science, P.O Box 1277, Gaza, Palestine;4. King Abdulaziz University, Chemistry Department, Faculty of Science, P.O Box 42805, Jeddah, 21589, Saudi Arabia;5. Chemistry Department, Faculty of Applied Science, Alaqsa University, Gaza, Palestine;6. Department of Chemistry, Faculty of Natural and Mathematics Science, University of Prishtina, 10000, Prishtina, Kosovo;7. Materials Science-Nanochemistry Research Group, NanoAlb-Unit of Albanian Nanoscience and Nanotechnology, 1000, Tirana, Albania;8. Faculty of Chemistry, National University of Uzbekistan, Tashkent, 100034, Uzbekistan;9. Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine;10. Department of Biochemistry, Federal University of Technology, PMB 704, Akure, Nigeria;1. POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta zentroa, Tolosa Hiribidea 72, Donostia-San Sebastián 20018, Spain;2. Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain |
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| Abstract: | A novel kinetic treatment is proposed for the copolymerization of two monomers, M1 and M2, when M2 has a low ceiling temperature. In the mechanism used, the growing copolymer with a terminal −M2M2· can undergo depropagation to −M2· and M2. If [M1] ⪢ [M2], as is possible experimentally when M2 is radioactively labelled, a value of the reactivity ratio r1 which is independent of the ceiling temperature effect can be obtained. This value is then used to obtain a value of the reactivity ratio r2 which is also independent of the ceiling temperature effect. The derivation is valid provided that r2 is small, which is often the case when M2 has a low ceiling temperature. The method involves solution for r2 by means of intersecting parabolas, each one representing a given monomer feed ratio and copolymer composition ratio. |
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