There are two types of polymerization reactions: addition and condensation.
有两种类型的聚合反应：加成和缩合。
There are two types of polymerization techniques: addition and condensation.
共有两种聚合技术：加成与缩合。
In this study, N-methylene phosphonic chitosan (NPCS) was synthesized via formaldehyde addition and condensation with phosphoric acid in a step reaction.
以甲醛和磷酸为反应试剂，采用均相反应法制备出壳聚糖(CS)的磷酸化衍生物-甲基磷酸化壳聚糖(NPCS)。
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