Interpenetration of chemically identical polymer onto grafted substrates

Hoyeon Lee, Seongjun Jo, Toyoaki Hirata, Norifumi L. Yamada, Keiji Tanaka, Eunkyoung Kim, Du Yeol Ryu

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    Interpenetrating interfaces between a deuterated polystyrene (dPS) and the grafted substrates with the same chemical identity were characterized using neutron reflectivity (NR) measurements, where the PS-grafted substrates were prepared using a grafting-to approach with hydroxyl end-functionalized polystyrene (PSOH) in a dry brush regime. The characteristic brush thickness (h) and grafting density (σ) of PS-grafted layers were determined based on the chain length (or molecular weight, Mn) of PSOHs. The experimental interpenetration length (ξ) was measured at the interfaces, and the limiting plateau in ξ above which the value was independent of film thickness shifted toward higher values as the Mn of PSOH increased. Normalization by the deformed brush thickness (hd) of PS-grafted layer after interpenetration revealed that the experimental value of ξ/hd in a short and dense PS-grafted substrate, prepared with a low-molecular-weight PSOH, deviated markedly from the theoretical value, indicating significant additional stretching of the grafted chains to accommodate inter-mixing with the dPS chains.

    Original languageEnglish
    Pages (from-to)70-75
    Number of pages6
    Journalpolymer
    Volume74
    DOIs
    Publication statusPublished - Aug 14 2015

    All Science Journal Classification (ASJC) codes

    • Organic Chemistry
    • Polymers and Plastics
    • Materials Chemistry

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