Precipitation polymerization of acrylic acid in toluene. I : Synthesis, characterization and kinetics

摘要: Abstract Acrylic acid was isothermally polymerized by precipitation polymerization in toluene at various monomer and initiator concentrations over the temperature range of 40°C–50°C. 2,2′-azobis (2,4-dimethyl-valeronitrile) employed as a chemical initiator. The rate found to depend on concentration 1.7th 0.6th orders, respectively. greater than first order dependence signifies secondary, monomer-enhanced, decomposition step for molecules. approximately 0.5 indicates that chain termination process is predominantly bi-macromolecular. obeys an Arrhenius equation with activation energy be 21.49 kcal/mol. This result agrees well literature values 23.5 22.0 kcal/mol obtained solution partially neutralized acrylic (pH=11) undissociated (pH=1), weight average molecular polymer independent conversion, indicating transfer controlling reaction.