Aggregation States of Polymers at Hydrophobic and Hydrophilic Solid Interfaces

Manabu Inutsuka, Ayanobu Horinouchi, Keiji Tanaka

    Research output: Contribution to journalArticlepeer-review

    31 Citations (Scopus)

    Abstract

    Aggregation states of polystyrene (PS) and poly(methyl methacrylate) (PMMA) at hydrophobic deuterated-octadecyltrichlorosilane (OTS-d) and hydrophilic SiOx interfaces are discussed, focusing on the interaction strength between polymer and substrate. Sum-frequency generation spectroscopy revealed that PS exhibited oriented phenyl groups along the normal direction at the interface in a spin-coated film because of the centrifugal force generated during the film solidification process, whereas it did not in a solvent-cast film. This result was common for both hydrophobic and hydrophilic substrates. That is, the aggregation states of PS depended little on which kind of substrate was used. This is because the interaction between PS and the surfaces is weak. In the case of a PMMA film on the hydrophobic OTS-d substrate, the interfacial local conformation was also dependent on the method of film preparation. PMMA at the hydrophilic SiOx interface, however, exhibited oriented ester methyl groups along the direction normal to the interface, regardless of the film preparation method. This is due to a stronger interaction via hydrogen bonding between carbonyl groups of PMMA and the substrate surface.

    Original languageEnglish
    Pages (from-to)1174-1178
    Number of pages5
    JournalACS Macro Letters
    Volume4
    Issue number10
    DOIs
    Publication statusPublished - Oct 20 2015

    All Science Journal Classification (ASJC) codes

    • Organic Chemistry
    • Polymers and Plastics
    • Inorganic Chemistry
    • Materials Chemistry

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