A process for crosslinking polymer which comprises: in the absence of moisture, introducing a silane into the structure of a thermoplastic polymer to be crosslinked to form a silane-modified polymer; and, crosslinking the silane-modified polymer of step by exposure of said polymer to a source of moisture and hydrolysis/condensation, optionally, in the presence of a hydrolysis/condensation catalyst; wherein the silane has the general formula: [Y[-G(-SiX u Z b v Z c w) s] r] n (Formula 1) wherein each occurrence of G is independently chosen from a set of groups comprising a polyvalent group derived by substitution of one or more hydrogen atoms of an alkyl, alkenyl, aryl or aralkyl group, with G containing from 1 to 30 carbon atoms; each occurrence of X is independently selected from the group consisting of -Cl, -Br, R 1 O-, R 1 C(=O)O-, R 1 R 2 C=NO-, R 1 R 2 NO- or R 1 R 2 N-, R 1 -, -(OSiR 1 R 2) t (OSiR 1 R 2 R 3), and -O(R 10 CR 11) f OH, wherein each occurrence of R 1, R 2, R 3, R 10 and R 11 is independently R; each occurrence of Z b is a bridging dialkoxy group by the formula of [-O(R 10 CR 11) f O-] 1/2, wherein each occurrence of R 10 and R 11 is independently R, wherein two different silicon atoms are each bound to one oxygen atom, which is in turn bound to the common divalent hydrocarbon group; each occurrence of Z c is a cyclic dialkoxy group by the formula-O(R 10 CR 11) f O-, wherein each occurrence of R 10 and R 11 is independently R, wherein cyclization is about silicon, by two oxygen atoms each attached to a common divalent hydrocarbon group; each occurrence of R is chosen independently from the set of groups comprising hydrogen; straight, cyclic or branched alkyl groups and can contain unsaturated, alkenyl groups, aryl groups and aralkyl groups; each occurrence of R containing 1 to 20 carbon atoms; each occurrence of the subscript f is an integer from 1 to 15, each occurrence of n is an integer from 1 to 100, with the proviso that when n is greater than 1, v is a greater than 0 and all the valences for Z b have a silicon atom bonded to them, each occurrence of the subscript u is an integer from 0 to 3, each occurrence of the subscript v is an integer from 0 to 3, each occurrence of the subscript w is an integer from 0 to 1, with the proviso that u+v+2w=3, each occurrence of the subscript r is an integer from 1 to 6, each occurrence of the subscript t is an integer from 0 to 50, and each occurrence of the subscript s is an integer from 1 to 6; and each occurrence of Y is an organofunctional group of valence r; and the silane containing at least one occurrence of Z b or Z c. in the absence of moisture, introducing a silane into the structure of a thermoplastic polymer to be crosslinked to form a silane-modified polymer; and, crosslinking the silane-modified polymer of step by exposure of said polymer to a source of moisture and hydrolysis/condensation, optionally, in the presence of a hydrolysis/condensation catalyst; each occurrence of G is independently chosen from a set of groups comprising a polyvalent group derived by substitution of one or more hydrogen atoms of an alkyl, alkenyl, aryl or aralkyl group, with G containing from 1 to 30 carbon atoms; each occurrence of X is independently selected from the group consisting of -Cl, -Br, R 1 O-, R 1 C(=O)O-, R 1 R 2 C=NO-, R 1 R 2 NO- or R 1 R 2 N-, R 1 -, -(OSiR 1 R 2) t (OSiR 1 R 2 R 3), and -O(R 10 CR 11) f OH, wherein each occurrence of R 1, R 2, R 3, R 10 and R 11 is independently R; each occurrence of Z b is a bridging dialkoxy group by the formula of [-O(R 10 CR 11) f O-] 1/2, wherein each occurrence of R 10 and R 11 is independently R, wherein two different silicon atoms are each bound to one oxygen atom, which is in turn bound to the common divalent hydrocarbon group; each occurrence of Z c is a cyclic dialkoxy group by the formula-O(R 10 CR 11) f O-, wherein each occurrence of R 10 and R 11 is independently R, wherein cyclization is about silicon, by two oxygen atoms each attached to a common divalent hydrocarbon group; each occurrence of R is chosen independently from the set of groups comprising hydrogen; straight, cyclic or branched alkyl groups and can contain unsaturated, alkenyl groups, aryl groups and aralkyl groups; each occurrence of R containing 1 to 20 carbon atoms; each occurrence of the subscript f is an integer from 1 to 15, each occurrence of n is an integer from 1 to 100, with the proviso that when n is greater than 1, v is a greater than 0 and all the valences for Z b have a silicon atom bonded to them, each occurrence of the subscript u is an integer from 0 to 3, each occurrence of the subscript v is an integer from 0 to 3, each occurrence of the subscript w is an integer from 0 to 1, with the proviso that u+v+2w=3, each occurrence of the subscript r is an integer from 1 to 6, each occurrence of the subscript t is an integer from 0 to 50, and each occurrence of the subscript s is an integer from 1 to 6; and each occurrence of Y is an organofunctional group of valence r; and the silane containing at least one occurrence of Z b or Z c.