| 초록 |
Living ring opening metathesis copolymerization of polyhedral oligomeric silsesquioxane (POSS) monomer (NBEPOSS) and 5-norbornene-2,3-dicaboxylic acid trimethyl ester (NBETMS) was performed via Grubbs catalyst, RuCl2(=CHPh)(PCy3)2. The block copolymers were then converted to diblock copolymers with 5-norbornene-2,3-dicaboxylic acid (NBECOOH) and NBEPOSS two blocks by precipitating the polymer in dichloromethane or hexane. For polymerization of NBETMS as the first block, a linear dependence of Mn on conversion, linear ln([M0]/[M]) on reaction time, very low Mn/Mw values demonstrate a living process. |
