Morphology and phase transitions in styrene-butadiene-styrene triblock copolymer grafted with isobutyl-substituted polyhedral oligomeric silsesquioxanes

Daniel B. Drazkowski, Andre Lee, Timothy S. Haddad

    Research output: Contribution to journalArticle

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    Abstract

    Two symmetric triblock polystyrene-butadiene-polystyrene (SBS) copolymers with different initial morphologies were grafted with varying amounts of isobutyl-substituted polyhedral oligomeric silsesquioxane (POSS) molecules. The POSS octamers, R′R7Si8O12, were designed to contain a single silane functional group, R′, which was used to graft onto the dangling 1,2-butadienes in the polybutadiene block and seven identical organic groups, R = isobutyl (iBu). Morphology and phase transitions of these iBu-POSS-modified SBS were investigated using small-angle X-ray scattering and Rheological methods. It was observed that when iBu-POSS was grafted to the butadiene segment, the long-range and local order of the morphology were preserved, and the d-spacing showed a small, systematic increase with increasing POSS content. These observations suggest that grafted iBu-POSS were well-distributed within the butadiene domains and did not interact with the styrene domains; effectively, grafting of iBu-POSS to butadiene did not affect the segregation between butadiene and styrene domains. However, addition of iBu-POSS reduces the overall polystyrene volume. Consequently, from a morphology standpoint, this modification effectively shifts the phase diagram to lower styrene content. This was supported with SAXS and transition temperatures measurements made from the different host morphologies.

    Original languageEnglish (US)
    Pages (from-to)2798-2805
    Number of pages8
    JournalMacromolecules
    Volume40
    Issue number8
    DOIs
    StatePublished - Apr 17 2007

    Profile

    Butadiene
    Styrene
    Polystyrenes
    Phase transitions
    Cetomacrogol
    Hyperostosis, Cortical, Congenital
    Cardenolides
    Chlormadinone Acetate
    X ray scattering
    Grafts
    Copolymers
    Molecules
    Polybutadienes
    Silanes
    Temperature measurement
    Functional groups
    Superconducting transition temperature
    Block copolymers
    Phase diagrams

    ASJC Scopus subject areas

    • Materials Chemistry

    Cite this

    Morphology and phase transitions in styrene-butadiene-styrene triblock copolymer grafted with isobutyl-substituted polyhedral oligomeric silsesquioxanes. / Drazkowski, Daniel B.; Lee, Andre; Haddad, Timothy S.

    In: Macromolecules, Vol. 40, No. 8, 17.04.2007, p. 2798-2805.

    Research output: Contribution to journalArticle

    Drazkowski, Daniel B.; Lee, Andre; Haddad, Timothy S. / Morphology and phase transitions in styrene-butadiene-styrene triblock copolymer grafted with isobutyl-substituted polyhedral oligomeric silsesquioxanes.

    In: Macromolecules, Vol. 40, No. 8, 17.04.2007, p. 2798-2805.

    Research output: Contribution to journalArticle

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    abstract = "Two symmetric triblock polystyrene-butadiene-polystyrene (SBS) copolymers with different initial morphologies were grafted with varying amounts of isobutyl-substituted polyhedral oligomeric silsesquioxane (POSS) molecules. The POSS octamers, R′R7Si8O12, were designed to contain a single silane functional group, R′, which was used to graft onto the dangling 1,2-butadienes in the polybutadiene block and seven identical organic groups, R = isobutyl (iBu). Morphology and phase transitions of these iBu-POSS-modified SBS were investigated using small-angle X-ray scattering and Rheological methods. It was observed that when iBu-POSS was grafted to the butadiene segment, the long-range and local order of the morphology were preserved, and the d-spacing showed a small, systematic increase with increasing POSS content. These observations suggest that grafted iBu-POSS were well-distributed within the butadiene domains and did not interact with the styrene domains; effectively, grafting of iBu-POSS to butadiene did not affect the segregation between butadiene and styrene domains. However, addition of iBu-POSS reduces the overall polystyrene volume. Consequently, from a morphology standpoint, this modification effectively shifts the phase diagram to lower styrene content. This was supported with SAXS and transition temperatures measurements made from the different host morphologies.",
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