Structure/Property Relationships in Polystyrene-Polyisobutylene-Polystyrene Block Copolymers
Document Type
Article
Publication Date
3-8-2001
Department
Polymers and High Performance Materials
Abstract
Structure/property relationships of polystyrene-polyisobutylene-polystyrene (PS-PIB-PS) triblock copolymer made by different processes were studied using dynamic mechanical analysis (DMA). The PS-PIB-PS films were composed of approximately 30% polystyrene end-blocks. Small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) confirm that a self-assembled, segregated cylindrical morphology forms in the copolymer. DMA was used as a tool to investigate the structure-property relationships in these polymers. Modified PS-PIB-PS copolymers were also characterized. Modifications of the copolymers were carried out by conversion of approximately 20 mol% of the polystyrene end-blocks to styrene sulfonic acid. The modified copolymers exhibited distinctly different thermal characteristics than the unmodified copolymers, which were most notable in the storage modulus and tan delta data. The presence of sulfonic acid groups disrupted the morphology and solvent sorption characteristics of the copolymers. Dynamic mechanical behavior is discussed as it relates to the morphology of the PS-PIB-PS copolymers formed via different processing methods and chemical modification. (C) 2001 Elsevier Science B.V. All rights reserved.
Publication Title
Thermochimica Acta
Volume
367
First Page
125
Last Page
134
Recommended Citation
Crawford, D. M.,
Napadensky, E.,
Tan, N. B.,
Reuschle, D. A.,
Mauritz, K. A.,
Laverdure, K. S.,
Gido, S. P.,
Liu, W.,
Hsiao, B.
(2001). Structure/Property Relationships in Polystyrene-Polyisobutylene-Polystyrene Block Copolymers. Thermochimica Acta, 367, 125-134.
Available at: https://aquila.usm.edu/fac_pubs/3933