Comparison of Gel Relaxation Times and End-Block Pullout Times in ABA Triblock Copolymer Networks

Peters, Andrew J.; Lodge, Timothy P.

doi:10.1021/acs.macromol.6b01921

Comparison of Gel Relaxation Times and End-Block Pullout Times in ABA Triblock Copolymer Networks

Journal Article · Fri Sep 30 04:00:00 EDT 2016 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.6b01921· OSTI ID:1331708

Peters, Andrew J. ^[1]; Lodge, Timothy P. ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)

The gel relaxation times of two different poly[styrene-$$b$$-(ethylene-alt-propylene)-$$b$$-styrene] (SEPS) ABA triblock copolymers in squalane at various concentrations has been measured by rheology. These relaxation times were compared with the results of previous time-resolved small-angle neutron scattering (TR-SANS) experiments, which measured chain exchange kinetics in SEP diblock and SEPS triblock micelles in squalane. We report the gels relaxed up to four orders of magnitude faster than expected based on the chain exchange measurements of equivalent diblock polymers. By accounting for two factors—a bias toward shorter end-block lengths in the gel relaxation, and a reduction in the energy barrier to chain pullout caused by the triblock architecture—a model is constructed that reconciles the surprisingly short gel relaxation times with the chain exchange times measured via TR-SANS.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: Infineum, LLP; National Science Foundation (NSF); Northwestern University; E.I. DuPont de Nemours & Co.; The Dow Chemical Company; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1331708

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 19 Vol. 49; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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