Synthesis and characterization of well-defined PVBCz-A-PDMAEMA multifunctional block copolymer prepared via ATRP

摘要

A functional polymer containing carbazole unit, PVBCz, was successfully prepared via atom transfer radical polymerization (ATRP) of 9-(4-vinylbenzyl)-9H-carbazole (VBCz). The controlled features of ATRP were confirmed by the linear increment of the molecular weight with the monomer conversion, while the molecular weight distribution was relatively narrow (M_w/M_n<1.33). The block copolymer PVBCz-b-PDMAEMA was synthesized via ATRP, using PVBCz-Br as a macro-initiator and DMAEMA as the second monomer. ~1H-NMR, GPC and FT-IR characterization confirmed the successful synthesis of PVBCz-b-PDMAEMA. The resulting copolymer exhibited both fluorescence from PVBCz segments and thermo-responsiveness from PDMAEMA segments. Moreover, the fluorescent intensity of PVBCz-b-PDMAEMA in aqueous solutions increased as the temperature rose, which could be attributed to the coupling of two different functions.