This work focuses on the temperature-dependent structural and rheological characterization of polystyrene-b-poly(n-butyl acrylate)-b-polystyrene triblock copolymers (PS-b-PnBA-b-PS) in the melt and, in particular, on their ability to show a lower disorder-to-order temperature (LDOT). To this aim, copolymers of varying block lengths, but keeping the PnBA block as a major component, were synthesized. Small-angle x-ray scattering revealed that the copolymers with short PS blocks (∼10 kg/mol) approach an LDOT but do not cross it. At room temperature, these copolymers exhibit higher moduli compared to a PnBA homopolymer due to the reinforcing effect of the PS but are flowing at temperatures above the glass transition of the PS. Increasing the PS and PnBA block length, to keep the same PS fraction, induces more profound changes in the structural and viscoelastic behaviors. Such a copolymer crosses the LDOT, leading to a microphase-separated and ordered state at high temperature. Contrary to the copolymers with short PS blocks, the flow regime was not reached, even at temperatures well above the glass transition of the PS. Instead, a low-frequency plateau was observed in rheology, showing the increased lifetime of the microphase-separated PS domains. ABA triblock copolymers exhibiting an LDOT behavior could, thus, be of interest for the design of thermoplastic elastomers or pressure-sensitive adhesives that can resist the flow at high temperatures.
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November 2022
Research Article|
November 01 2022
Exploiting the lower disorder-to-order temperature in polystyrene-b-poly(n-butyl acrylate)-b-polystyrene triblock copolymers to increase their flow resistance at high temperature
Special Collection:
Double Dynamics Polymeric Networks
Clément Coutouly;
Clément Coutouly
1
Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter division (BSMA), Université catholique de Louvain
, Place Pasteur 1 and Place Croix du Sud 1, Louvain-la-Neuve B-1348, Belgium
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Evelyne van Ruymbeke
;
Evelyne van Ruymbeke
a)
1
Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter division (BSMA), Université catholique de Louvain
, Place Pasteur 1 and Place Croix du Sud 1, Louvain-la-Neuve B-1348, Belgium
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Laurence Ramos
;
Laurence Ramos
2
Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS
, Montpellier, France
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Philippe Dieudonné-George;
Philippe Dieudonné-George
2
Laboratoire Charles Coulomb (L2C), Univ. Montpellier, CNRS
, Montpellier, France
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Charles-André Fustin
Charles-André Fustin
b)
1
Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter division (BSMA), Université catholique de Louvain
, Place Pasteur 1 and Place Croix du Sud 1, Louvain-la-Neuve B-1348, Belgium
b)Author to whom correspondence should be addressed; electronic mail: [email protected]
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a)
Electronic mail: [email protected]
b)Author to whom correspondence should be addressed; electronic mail: [email protected]
Note: This paper is part of the special issue on Double Dynamics Polymeric Networks
J. Rheol. 66, 1305–1318 (2022)
Article history
Received:
May 16 2022
Accepted:
August 24 2022
Citation
Clément Coutouly, Evelyne van Ruymbeke, Laurence Ramos, Philippe Dieudonné-George, Charles-André Fustin; Exploiting the lower disorder-to-order temperature in polystyrene-b-poly(n-butyl acrylate)-b-polystyrene triblock copolymers to increase their flow resistance at high temperature. J. Rheol. 1 November 2022; 66 (6): 1305–1318. https://doi.org/10.1122/8.0000506
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