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Unformatted text preview: 2 =CH 2 key issues: choosing initiator (I), condition to produce active site (k d ), reaction rate between active site and vinyl monomer(k i ). ( I*: free radical initiator) * 2 O C O heat O O C O O C propagation , in which high molecular weight polymer is formed. k p : rate constand of propagation k p n n CH 2 =CH 2 CH 2 =CH 2 I-CH 2-CH 2 * I-CH 2-CH 2-CH 2-CH 2 * I-CH 2-CH 2-(CH 2-CH 2 ) -CH 2-CH 2 * propagation continues until the growing long chain radical becomes deactived or exhaustion of monomer. This is the crucial step in determining rate of polymerization, polymer molecular weight termination , in which deactivation occurs to produce final stable polymer....
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- Fall '10