Question

34. Chain reaction polymerization. Show for three repeating units. (5 pts) ROOR RO-O- R OR IN TONG heat CN PROP: MANIA

Answer 1

Initiation RooR 2 RO Propogation - Ro't CH2=CH R-O-Chi-ch CN Monomer monomer free radical -CH2-CH & CN CN ch=ch Room, cr-en-ci Venech R-o (cha ch) chica che le champ comedy CN CN During propogation the monomer may add in four ways. (a) Tail to head. on CH₂ Ch & Ch₂= cn CH₂-ch - CH21 - CN (6) Tail to Tail ~CH2-cn cn=ch, Chi-cn-cn-che - ch cho cu cu to Head to Head anch - H₂ C + CHL=ch - mcu-CH2-CHE CN CN F-3 -CN

(d) Head to tail. noch-ch, tch=ch2 о си - cи - си- си, CN Termination. coupling with other radical is by transfer of hydrogen. ermination may occur by or by disproportion that Termination by coupling ich - CHL CN CN Ro- (chch) cn, cn-cn-chefenchor CN/2 CN CN/2 CN Termination by disproportion 12 ON CN/2 R(Chich) Ch2 cnn & Rochach cn=cn CN 2 CN ON 2
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