Prof Paula Hammond Lecture 25 147Living148 Cationic Polymerizations Examples of Cationic Polymerization Isobutyl Rubber Synthesis Polyvinyl Ethers Cationic Polymerization Some difference ID: 242913
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10.569 Synthesis of Polymers Prof. Paula Hammond Lecture 25: “Living” Cationic Polymerizations, Examples of Cationic Polymerization, Isobutyl Rubber Synthesis, Polyvinyl Ethers Cationic Polymerization Some differences between cationic and anionic polymerization Rates are faster for cationic (1 or more orders of magnitude faster than anionic or free radical) 4 , CFCOOH comes of f ClO 4 - H A wanttoavoidrecombinationthroughcounterion Lewis Acids Often as initiator/coordination complexes helps stabilize counterions and prevent recombination 4 - ] SbF 5 + HF [H + SbF 6 - ] Citation: Professor Paula Hammond, 10.569 Synthesis of Polymers Fall 2006 materials, MIT OpenCourseWare (http://ocw.mit.edu/index.html), Massachusetts Institute of Technology, Date.