Question

Describe, by using an example, the reaction mechanisms of radical addition polymerisation. Comment on how the kinetics of individual steps affect the quality of the polymer product. [20 marks] 2.

Answer 1

Reaetion me chanis m radical additi'on palym2ation exampk balyethene teh-C) We wil take an Inu'tation Active fe radicals ase generatd by themal ar nota chewaical decomposition d eoides, hydnperorides p diaz compeunds १ Ph Ph bentoyl toronide )2-cN CN C N CN AIBN The generatcd tre aadical adds to double nd the monsmr and the ee radi'cal ite in trafessed 1. Initodas sadical to tthe monome 1 CH H Pr ngatton cH2 1 H -cH I-CH2Ct CH C Theinutiotas menomes radital comlr add wit moe in eane chai'n ongt monoms to J

Termintion Com binatio oh by Teminatim canbe DirfropartHonation combinaton (C-CH m -l Thjurl cm bine mtn Dinprobtonedten n - Hin tnamfusıd from one to anethu cH2-H3 H-CH)m- n- Chain trarn fr CAn e hmam fisgud ta malutrd maltcule chaim molecude mondm (CH2-CH2 CH-H2ccy 2-CH2)CHC CH2CH CHCH (CH2-CH)n cHCH3CCH

Commerds on kineties individual stepa d 4ote initiati on in st the Bote d Dadi'cal entation will be more: So, Rot be fots rut, moleculos areught producf क्रिवं the eaction will Suling ps will be Aer uaity will 2ate nitiation Se these houdd be optimum w 44 ett prdpagottom in aots temeecular tureig bet the felymuh ill ale be fat 32ot tamination s fantr,ma beculas areigld S product quality will be bad be loues will 2 ki x [ Intiodan Rate initrodtion Redt pro pagoctiom Kp 3 Rocte tminatiom 2K Radi'cal centes MenamsRa dical erntes 17 Rate olymaizohiun b calculohon and atady ofot apprnimodtm /2 kd Nonemes