.? Chemistry of cross-inked polymers? Two ways of forming thermosetting polymers1. By polymerization (step ... primary chains as vulcanization does for natural rubber).? Step-growth polymerization reactions: ... ? 구별할 수 있는 두 가지 중합-Step polymerization단계중합-Chain polymerization 연쇄중합?Step polymerization?반응하는 부분