Understanding Interfacial Block Copolymer Structure and Dynamics

Goswami, Monojoy; Iyiola, Oluwagbenga Oare; Lu, Wei; Hong, Kunlun; Zolnierczuk, Piotr; Stingaciu, Laura-Roxana; Heller, William T.; Taleb, Omar; Sumpter, Bobby G.; Hallinan, Daniel T.

doi:10.1021/acs.macromol.2c01814

Title: Understanding Interfacial Block Copolymer Structure and Dynamics

Journal Article · Fri Jan 27 00:00:00 UTC 2023 · Macromolecules

DOI: https://doi.org/10.1021/acs.macromol.2c01814 · OSTI ID:1923177

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Florida A & M University, Tallahassee, FL (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS) outstation Juelich Centre for Neutron Science (JCNS), Forschungszentrum Juelich GmbH
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Here, block copolymer (BCP) structure and dynamics were studied using small-angle neutron scattering (SANS), neutron spin echo (NSE) spectroscopy, and molecular dynamics (MD) simulations to obtain a fundamental understanding of the impact of an interfacial block on chain dynamics. A glassy block acted as the interface, and the dynamics of a rubbery block was studied. The rubbery block was protonated near the interface in one sample and near the chain end in another sample to observe the interfacial effect on the rubbery polymer. Analysis of the structure and dynamics revealed that the interfacial rubbery block was confined in layered morphologies and exhibited much slower dynamics than the chain-end rubbery block that was dispersed in the rubbery matrix. The interfacial rubbery block showed weaker dynamical relaxation than that at the chain end, and it also had critically important length scale dependence. Dynamical slowing was only observed at length scales significantly larger than the characteristic segmental length, and the disparity between interfacial and chain-end dynamics increased with increasing length.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1923177

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 3 Vol. 56; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
copolymers
interfaces
molecular dynamics
polymers
scattering

Title: Understanding Interfacial Block Copolymer Structure and Dynamics

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