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Atom Transfer Radical Polymerization of Octadecyl Acrylate

GU Yu-rong, ZHU Xiu-lin, CHENG Zhen-ping, CHEN Jian-ying, LU Jian-mei(Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou Jiangsu 215006,China)  
?Atom Transfer Radical Polymerization (ATRP) of octadecyl acrylate (ODA) had been conducted successfully using iron dichloride tetrahydrate/triphenylphosphine (FeCl2·4H2O/ PPh3)as catalyst,ethyl-2-bromo propionate(EBP) as initiator,and toluene as solvent.Effect of polymerization temperature and amount of catalyst on rate of ODA ATRP was investigated.Relative molecular mass distribution of PODA was also discussed.Chain-extended reaction and analysis of polymer end group proved that ODA ATRP had the characteristics of "living"/ controllable radical polymerization.When n(ODA)/n(EBP)/n(FeCl2·4H2O)/n(PPh3) was 100/1/1/2,the apparent propogation rate constant (kappp) was 402×10-5 s-1 at 120 ℃,328×10-5 s-1 at 100 ℃,and 165×10-5 s-1 at 80 ℃,respectively.Equilibrium enthalpy of ODA ATRP was calculated.
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