Synthesis and Characterization of Triarylamine-Based Block Copolymers by Combination of C-N Coupling and ATRP for Photorefractive Applications

Abstract

Poly(4-butyltriarylamine)s with t-butyldimethylsilyl terminal protecting group (PBTPA-TBS) with various molecular weights were prepared by C-N coupling polymerization. The resulting precursors were postfunctionalized and subsequently used as macroinitiators for atom transfer radial polymerization (ATRP) of n-butyl acrylate (n-BA) and ethyl acrylate (EA). Both the polymerization processes were controlled and the polymers were characterized by 1 H NMR, gel permeation chromatography (GPC) and thermal properties, which confirmed the successful synthesis of all the polymers. The microphase separated behaviors of the poly (4-butyltriarylamine)-block-poly (butyl acrylate) (PBTPA-b-PBA) were examined by AFM in the film showing phase separation structures for all the polymers. The photorefractive property of the composite based on PBTPA-b-PBA block copolymer was evaluated by two-beam coupling experiment. A relative high gain coefficient of 42.7 cm −1 was obtained at the electric field of 31 V/m.

Smart Polyacrylate Emulsion Based on a New ABC-Type Triblock Copolymer via RAFT-Mediated Surfactant-Free Miniemulsion Polymerization: Its Multifunctional Properties

“…In Figure 2a, the main characteristic peaks at δ = 4.67 (1H, a) and δ = 4.13 (2H, b) ppm were observed corresponding to isobornyl and butyl unit of the triblock copolymer respectively. 36,37 The molar composition of the isobornyl unit of the PIBA segment was calculated using the peak ratio (a/k) in Figure 2a. The total molecular weight (M n,NMR = 15 535 g/mol, Table S3, E 5 ) of the triblock copolymer was obtained by summing up the molecular weight of the diblock and sum of the PIBA segment.…”

“…Figure a,b shows the 1 H NMR spectra of the triblock copolymer in CDCl 3 and D 2 O solvents, respectively. In Figure a, the main characteristic peaks at δ = 4.67 (1H, a) and δ = 4.13 (2H, b) ppm were observed corresponding to isobornyl and butyl unit of the triblock copolymer respectively. , …”