Living carbocationic polymerization |
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Authors: | Biao Wang Munmaya K. Mishra Joseph P. Kennedy |
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Affiliation: | (1) Institute of Polymer Science, University of Akron, 44325 Akron, OH, USA;(2) Present address: Scientific Research Institute of Petroleum Exploration and Development, Beijing, People's Republic of China |
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Abstract: | Summary The living synthesis of ,-di-tert.-chloropolyisobutylene (t-Cl-telechelic PIB) has been accomplished by the use of the sterically hindered bifunctional initiator 1,3-di-(2-methoxy-2-propyl)-5-tert.-butylbenzene (tBu-m-DiCuOMe) in conjunction with BC13 coinitiator in CH3Cl or CH2Cl2 diluents at –30°C and –10°C. The living nature of the polymerizations was demonstrated by linear ¯Mn versus WPIB (g of PIB formed) plots starting at the origin and horizontal N (number of PIB moles) versus WPIB plots. The molecular weight distributions are narrow (¯MW/¯Mn < 2.0) and tend to decrease with increasing molecular weights. Number average end functionalities have been quantitated and found to be ¯Fn = 2.0±0.1. |
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