Nanoconfinement-induced shift in photooxidative degradation pathway of polystyrene

Kim, Baekmin Q.; Ren, Tian; Majumder, Anirban; Lee, Daeyeon

doi:10.1016/j.jcis.2024.12.115

Nanoconfinement-induced shift in photooxidative degradation pathway of polystyrene

Journal Article · Sun Dec 15 23:00:00 EST 2024 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1016/j.jcis.2024.12.115· OSTI ID:2520498

^[1]; Ren, Tian ^[2]; ^[2]; ^[2]

University of Pennsylvania, Philadelphia, PA (United States); University of Delaware
University of Pennsylvania, Philadelphia, PA (United States)

Polymer nanocomposites with high concentrations of nanoparticles (NPs) possess exceptional mechanical, transport, and thermal properties. To enable their widespread use in structural applications and functional coatings, it is crucial to understand how nanoconfinement and the polymer-NP interface influence polymer degradation under various environmental conditions, including prolonged UV exposure. In this study, we investigate the photooxidative degradation of polystyrene (PS)-confined in the interstices of SiO₂ NP films. These nanocomposite films are prepared by the capillary rise infiltration (CaRI) of PS into interstices of SiO₂ NP packings, and subsequently subjected to UV irradiation. Our investigation reveals that PS degradation progresses uniformly across the thickness, with degradation initiating from the center of the NP interstitial pores and extending towards the NP surface. We rationalize this degradation mechanism based on the disparity in the surface energies of PS and the NP surface, as well as slow oxygen diffusion through confined PS. Here, we also demonstrate that packing smaller NPs at a given thickness or thicker packing of a specific NP size facilitates photooxidative degradation, highlighting the critical role of the number of interstitial pores in influencing degradation processes.

View Accepted Manuscript (DOE)

Research Organization:: University of Delaware, Newark, DE (United States)

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

Grant/Contract Number:: SC0021166

OSTI ID:: 2520498

Alternate ID(s):: OSTI ID: 2483628

Journal Information:: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Vol. 683; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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