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抑制剂 inhibitors： 抑制剂（又称为缓聚剂）是一种用来阻滞或降低化学反应速度的物质，作用与负催化剂相同。它不能停止聚合反应，只是减缓聚合反应。借以抑制或缓和化学反应的物质。 抑制剂种类很多，应用很广。如催化反应的负催化剂，高分子化合物的阻聚剂，塑料、橡胶、油脂等的抗氧剂，泡沫抑制剂，汽油的抗震剂，防腐蚀的缓冲剂等。如抗氧剂是食品、橡胶及其他有机物质中的氧化反应的抑制剂；食品中加入水杨酸是酸败的抑制剂；某些聚合物中加入紫外线抑制剂(如水杨酸甲酯等)防止因吸收紫外光而变质；有机磷酯是体内胆碱酯酶的抑制剂。某些聚合物的单体在贮存和运输期间，为了防止其自聚合，需要加入抑制剂。
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