Synthesis of polyurethane/polydimethylsiloxane graft copolymer by using macromonomer with a diol terminal group

2,2'-Di(hydroxymethyl)butoxypropyl-terminated polydimethylsiloxane (DHMBP-P DMS) was prepared as a new condensation type macromonomer with a diol termi nal group for the synthesis of graft copolymer. In order to prepare DHMBP-P DMS, we investigated the synthetic route via hydrosilylation of 1-allyloxy- 2,2'-di-(benzyloxymethyl)butane (ABMB) with hydrosilyl-terminated polydimet hylsiloxane (H-PDMS), followed by reductive elimination of the two benzyl g roups of 2,2'-di (benzyloxymethyl) butoxypropyl-terminated polydimethylsilo xane (DBMBP-PDMS). Then, polyurethane/polydimethylsiloxane (PU/PDMS) graft copolymers with different compositions were obtained by polyaddition of DHM BP-PDMS with p-xylylene glycol (XG) and 4,4'-diphenylmethane diisocyanate(D PMDI). The PU/PDMS graft copolymers were soluble in aprotic polar solvents such as DMF, DMAc DMSO and NMP, and insoluble in ordinary organic solvents such as acetone, THF, chloroform and dichloromethane.