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
聚合物系统中具有阻燃活性。
磷硫化合物的结构可以表示为:其中X为
氧或
硫,T为共价键,
氧、
硫或
氮,但至少一个X和T为
硫,每个X'独立地为
氧或
硫,每个m独立地为零或1(当X'为
氧时)和零、1或2(当X'为
硫时),n至少为1且最好至少为2,每个R独立地为未取代或惰性取代的烃基,或R基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。