Explanation

A substance that can terminate the polymerization reaction. These substances can react with primary and free radicals, causing them to lose activity and thus terminate chain growth. For example, ethanol is the terminator of cis-1,4-polybutadiene rubber catalyst "nickel bicycloalkanoate/triisobutyl aluminum/ethoxytrihydrate boron". When ethanol is added after polymerization, it can quickly react with triisobutyl aluminum or boron trifluoride, thus destroying the catalyst and stopping the polymerization reaction. Phenol, wood tar or thiuram disulfide are commonly used as terminators in the synthesis of lotion styrene butadiene rubber, whose function is to change the base of K increased A into a stable compound, and to destroy the residual initiator, so that it loses the ability to initiate.

Classification