Phosphorus-sulfur compounds have flame retardant activity in organic polymer systems. The phosphorus-sulfur compounds can be represented by the structure:
wherein X is oxygen or sulfur, T is a covalent bond, oxygen, sulfur or nitrogen, provided that at least one of X and T is sulfur, each X' is independently oxygen or sulfur, each m is independently zero or 1 when X' is oxygen and zero, 1 or 2 when X' is sulfur, n is at least 1 and preferably at least 2, each R is independently an unsubstituted or inertly substituted hydrocarbyl group or the R groups together form an unsubstituted or inertly substituted divalent organic group and A is an organic linking group.
磷硫化合物在有机聚合物体系中具有阻燃活性。
磷硫化合物可以用以下结构表示:
其中 X 是氧或
硫,T 是共价键、氧、
硫或氮,条件是 X 和 T 中至少有一个是
硫,每个 X' 独立地是氧或
硫,当 X' 是氧时,每个 m 独立地为 0 或 1,当 X' 是
硫时,每个 m 独立地为 0、1 或 2、n 至少为 1,最好至少为 2,每个 R 独立为未取代或惰性取代的烃基,或 R 基团共同形成未取代或惰性取代的二价有机基团,A 为有机连接基团。