GMA-Functionalized Reactive Stabilizer for Polymerization of Methyl Methacrylate in Supercritical CO2: Effect of Stabilizer,Initiator and Monomer Concentrations

摘要

Glycidyl methacrylate linked poly(dimethylsiloxane) (GMA-PDMS) was synthesized and used as a stabilizer for the dispersion polymerization of methyl methacrylate (MMA) in supercritical CO2.This study examined the effect of the concentrations of the stabilizer,2,2'-azobisisobutyronitrile (AIBN) initiator,and MMA on the yield,molecular weight,and morphology of the poly(methyl methacrylate) (PMMA) product.PMMA was obtained in 94.6% yield using only 0.87 wt% GMA-PDMS.When the AIBN concentration was increased from 0.25 to 1.06 wt%,the molecular weight and particle size of the PMMA decreased from 56,600 to 21,600 and from 4.1 to 2.7 mu m,whereas the particle size distribution increased from 1.3 to 1.9.The M_n of the PMMA product ranged from 41,600 and 55,800 under typical polymerization conditions.The PMMA particle diameter ranged from 1.8 to 11.0 mu m and the particle size distribution ranged from 1.4 to 1.8.