Quasi-elastic neutron scattering study on dynamically asymmetric polymer blends

Mbonu, Christopher; Osti, Naresh C.; Wu, Di; Akcora, Pinar

doi:10.1002/pol.20240161

Quasi-elastic neutron scattering study on dynamically asymmetric polymer blends

Journal Article · Sat Jun 15 00:00:00 EDT 2024 · Journal of Polymer Science

DOI:https://doi.org/10.1002/pol.20240161· OSTI ID:2447299

Mbonu, Christopher ^[1]; ^[2]; Wu, Di ^[1]; ^[1]

Stevens Institute of Technology, Hoboken, NJ (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Compatibility between polymers with different glass transition temperatures controls the thermomechanical properties of blends. This work explores the segmental dynamics of poly(methyl acrylate) (PMA) chains when they are blended with polymers of different rigidities and miscibility. Inspired by the intriguing dynamic asymmetry of chains within the interfacial layer of nanoparticles, this study aims to understand dynamic heterogeneity in dynamically asymmetric blends of PMA/poly(methyl methacrylate) (PMMA), PMA/polystyrene (PS), and PMA/poly(ethylene oxide) (PEO) using the differential scanning calorimetry (DSC) and quasi-elastic neutron scattering (QENS) measurements below and above the glass transition temperature of PMMA or PS. Further, results revealed that the segmental jump distance of PMA increased on blending due to volume enhancement. The reduced effective diffusivity of PMA in PMMA is attributed to PMMA's enhanced flexibility (lower characteristic ratio, C_∞) and superior interaction (lower ) when compared with the PS environment. The results demonstrate that the chain rigidity and miscibility affect the free volume, interchain cooperativity, and segmental dynamics in dynamically asymmetric blends.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2447299

Journal Information:: Journal of Polymer Science, Journal Name: Journal of Polymer Science Journal Issue: 18 Vol. 62; ISSN 2642-4150

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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