A "Click Chemistry" Approach to Linear and Star-Shaped Telechelic POSS-Containing Hybrid Polymers

A click chemistry approach applied in the preparation of telechelic polyhedral oligomeric silsesquioxanes (POSS) containing polymer hybrids by combining with atom transfer radical polymerization (ATRP) was examined. The spectra of 3-propargylcarbonylpropionic chloride (PCPCl) and 3-propargylcarbonylpropionic acid (PCPA) were compared that showed that the broad band from 2225 to 3251 cm -1 disappeared in the spectrum of PCPCl, and a new band appeared at 1785 cm -1, which was assigned to the stretching vibration of carbonyl chloride. The dibromo-terminated polystyrene was synthesized by ATRP using diethyl 2,6-dibromoheptanrdioate as initiator and CuBr/PMDETA as the catalyst. The terminal bromine atoms of polystyrene (PS)-Br2 were easily transformed into azide groups to produce diazido-polystyrene, PS-(N3)2 through nucleophilic substitution. The monobromo-terminated polystyrene (PS-Br) was prepared by using ethyl 2-bromoisobutyrate (EBiB) as initiator.