Temperature-dependent self-assembly and rheological behavior of a thermoreversible pmma-P n BA-PMMA triblock copolymer gel

Zabet, Mahla; Mishra, Satish; Boy, Ramiz; Walters, Keisha B.; Naskar, Amit K.; Kundu, Santanu

doi:10.1002/polb.24336

Temperature-dependent self-assembly and rheological behavior of a thermoreversible pmma-P n BA-PMMA triblock copolymer gel

Journal Article · Sat Mar 25 04:00:00 EDT 2017 · Journal of Polymer Science. Part B, Polymer Physics

DOI:https://doi.org/10.1002/polb.24336· OSTI ID:1368270

Zabet, Mahla ^[1]; Mishra, Satish ^[1]; Boy, Ramiz ^[2]; Walters, Keisha B. ^[3]; Naskar, Amit K. ^[2]; Kundu, Santanu ^[1]

Dave C. Swalm School of Chemical Engineering, Mississippi State University, MS State Mississippi 39762
Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge Tennessee 37831
School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman Oklahoma 73019

Self-assembly and mechanical properties of triblock copolymers in a mid-block selective solvent are of interest in many applications. Herein, we report physical assembly of an ABA triblock copolymer, [PMMA–PnBA–PMMA] in two different mid-block selective solvents, n-butanol and 2-ethyl-1-hexanol. Gel formation resulting from end-block associations and the corresponding changes in mechanical properties have been investigated over a temperature range of -80 °C to 60 °C, from near the solvent melting points to above the gelation temperature. Shear-rheometry, thermal analysis, and small-angle neutron scattering data reveal formation and transition of structure in these systems from a liquid state to a gel state to a percolated cluster network with decrease in temperature. The aggregated PMMA end-blocks display a glass transition temperature. Our results provide new understanding into the structural changes of a self-assembled triblock copolymer gel over a large length scale and wide temperature range.

Research Organization:: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)

Sponsoring Organization:: NSF

OSTI ID:: 1368270

Journal Information:: Journal of Polymer Science. Part B, Polymer Physics, Journal Name: Journal of Polymer Science. Part B, Polymer Physics Journal Issue: 11 Vol. 55; ISSN 0887-6266

Publisher:: Wiley

Country of Publication:: United States

Language:: ENGLISH

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