Phosphorus-containing compound and preparation method and use thereof

A phosphorus-containing compound of formula (I):

• wherein, in formula (I),
• n is 0, 1, 2, 3, or 4;
• the plural R groups, identical to or different from each other, are independently selected from C1-C6 alkylene group;
• the Rb group is H or C1-C6 linear or branched alkyl;
• the plural R0 groups, identical to or different from each other, are independently selected from H, C1-C10 linear alkyl, C1-C10 branched alkyl, and
• with the proviso that at least one R0 in formula (I) is
• in
• x is 1, 2, or 3, y is an integer of 1 to 5, and a sum of x+y is less than or equal to a number of hydrogen atoms available to be substituted on the Ar group;
• the plural R1 groups, identical to or different from each other, are independently selected from H, C1-C6 linear alkyl, and C1-C6 branched alkyl, the plural Ar groups, are benzene rings, R2 group is a single bond or C1-C6 alkylene;
• the plural A groups, identical to or different from each other, are independently selected from
• and C1-C10 linear or branched alkyl group substituted by
• each X group is O, a is 1, each R′ is independently selected from C1-C10 linear alkyl, C1-C10 branched alkyl, benzyl optionally substituted by C1-C10 linear or branched alkyl, and phenyl optionally substituted by C1-C10 linear or branched alkyl.