Amphiphilic Norbornene-Based Diblock Copolymers Containing Polyhedral Oligomeric Silsesquioxane Prepared by Living Ring Opening Metathesis Polymerization

摘要

We report the successful synthesis of poly(NBECOOH-b-NBEPOSS) copolymers,taking advantage of the sequential,living ring opening metathesis polymerization of NBETMS and NBEPOSS using the RuCl2 (=CHPh)(PCy3)2/CH2Cl2/20 °C system,followed by the hydrolysis of trimethylsilyl groups in poly(NBETMS-b-NBEPOSS) copolymers.The living behavior of ROMP of NBETMS was first investigated using two diagnostic plots,a first order kinetic plot and a M_n vs.conversion plot.The plots confirmed that no termination and chain transfer reaction had occurred during polymerization.Poly(NBECOOH-b-NBEPOSS) copolymers were prepared using the sequential monomer addition of NBEPOSS to living poly(NBETMS) chain ends,followed by the hydrolysis of trimethylsilyl groups in the poly(NBETMS-b-NBEPOSS) copolymers.The high structural integrity of poly(NBE-COOH-b-NBEPOSS) copolymers was confirmed by 1H-NMR,13C-NMR spectroscopy and GPC.