Structure and Properties of Poly(butyl acrylate‐block‐sulfone‐block‐butyl acrylate) Triblock Copolymers Prepared by ATRP

Macromolecular Chemistry and Physics - Tập 206 Số 1 - Trang 33-42 - 2005
Ying Zhang1,2, Im Sik Chung3, Jinyu Huang3, Krzysztof Matyjaszewski3,4,5, Tadeusz Pakuła4,1,5
1Max-Planck-Institute for Polymer Research, P.O. Box 3148, 55021 Mainz, Germany
2Present address: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CAS), Changchun, China.
3Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA
4Krzysztof Matyjaszewski, Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
5Tadeusz Pakula, Max-Planck-Institute for Polymer Research, P.O. Box 3148, 55021 Mainz, Germany.

Tóm tắt

AbstractSummary: A series of telechelic OH polysulfones (PSU) were converted to atom transfer radical polymerization (ATRP) macroinitiators by reaction with 2‐bromoisobutyryl bromide. Three macroinitiators with different chain lengths were extended with poly(butyl acrylate) (PBA) to form ABA triblock copolymers. The structure and dynamics of the ABA triblock copolymers with PSU central segments and various molecular weight PBA side chains were investigated by small‐angle X‐ray scattering and rheology. The block copolymers form micelles with a PSU core and PBA corona. The length of each block has an important effect on the structure and resulting dynamics of the copolymers. Dynamic mechanical measurements indicate three relaxation modes: (i) PBA segmental relaxation at high frequency; (ii) PBA relaxation of the corona block at intermediate frequency; (iii) an additional relaxation process related to structural rearrangement of the micelles at low frequency. The shear modulus plateau corresponding to a soft rubbery state extends over a very broad time or temperature range because of this slow additional relaxation.Schematic illustration of the structural elements and the bulk supramolecular structure for a symmetric triblock copolymer with a stiff central segment strongly incompatible with the other constituent.magnified imageSchematic illustration of the structural elements and the bulk supramolecular structure for a symmetric triblock copolymer with a stiff central segment strongly incompatible with the other constituent.

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Macromolecular Chemistry and Physics

Tập 206 Số 1

33-42

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