Chap._300031 - -proton elimination A + -x x + -CH 3 CH 3 CH...

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* PIB and Butyl Rubber Cationic Polymerization y: 1-3 mole% (R: H or CH 3 ) R + CH 3 CH 2 =CH-CH=CH 2 or CH 2 =CH-C=CH 2 CH 3 CH 3 CH 2 =C -(CH 2 -C) -(CH 2 -CH=C-CH 2 ) - AlCl 3 /HCl y x x CH 3 CH 3 CH 3 CH 3 Butyl Ribber -(CH 2 -C) - PIB The polymerization of isobutene can only be accomplished with cationic initiators. Aluminium chloride and boron trifluoride are the preferred initiators for commercial processes; the separate addition of a co-initiator is not generally necessary and adventitious substances possibly fulfil this role.
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Unformatted text preview: -proton elimination A + -x x + -CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 H-(CH 2-C) -CH 2-C H-(CH 2-C) -CH 2-C=CH 2 + H AlCl 4 Termination A + -CH 3 CH 3 H + n A + -CH 3 CH 3 CH 3-C Propagation--A : A +-AlCl 4 CH 3 CH 3 CH 3-C CH 3 CH 3 + -+ -H AlCl 4 + CH 2 =C Initiation AlCl 3 + HCl H AlCl 4 CH 3 CH 3 CH 2 =C x CH 3 CH 3-(CH 2-C) -CH 2-C...
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This note was uploaded on 10/16/2010 for the course MATSE 441 taught by Professor Chung,tze-chiang during the Fall '10 term at Pennsylvania State University, University Park.

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