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 subse- quently 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 1H NMR, gel permeation chromatography (GPC) and thermal properties, which confirmed the successful synthesis of all the poly-mers. 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.
Highlights
Because of the excellent charge transporting properties, triarylamine (TAA) derivatives have been intensively studied and been widely used in thin layer electrooptical devices such as electroluminescent, solar cell and photorefractive holograph [1,2,3,4]
TBS end group was converted to hydroxyl, and reacted with 2-bromopropionyl bromide to obtain PBTPA with bromo ester end group that was used as a macroinitiator for atom transfer radial polymerization (ATRP)
Preliminary studies revealed that the preparation of PBTPA-b-PBA via C-N coupling polymerization in the presence of a terminal modifier with PBA chain or ATRP initiating 2-bromopropionate moiety afforded PBTPA homopolymer without designed chain end in a relatively low yield
Summary
Because of the excellent charge transporting properties, triarylamine (TAA) derivatives have been intensively studied and been widely used in thin layer electrooptical devices such as electroluminescent, solar cell and photorefractive holograph [1,2,3,4]. Reported a new approach to synthesize PTAA from A-B type monomer by C-N coupling polymerization using palladium based system as a catalyst [9,10,11]. A serious of PTAA-based block copolymers have been successfully prepared by adding terminal modifying macroinitiators during the polymerizations. The possibility of designing new TAA-based materials to meet the requirements of applications. It is possible that introduction of soft block with high polarity to PTAA improves the miscibility of EO chromophore. The block copolymers containing PTAA segment and poly (n-butyl acrylate) (PBA) or poly (ethyl acrylate) segment were prepared by combination of C-N coupling and ATRP for the first time. The unique structures of these block copolymers are expected to improve the performance of PR materials as described above
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