['Step', '-', 'growth', 'polymerization', 'is', 'widely', 'used', 'for', 'synthesis', 'of', 'polyesters', ',', 'polyamide', 'and', 'epoxies', 'while', 'the', 'synthesis', 'of', 'polyacrylics', 'requires', 'the', 'use', 'of', 'free', 'radical', 'polymerization', '.']