On the properties of poly(isoprene-b-ferrocenylmethyl methacrylate) block copolymers

Sergey Chernyy, Jacob Judas Kain Kirkensgaard, Anders Bakke, Kell Mortensen, Kristoffer Almdal

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    Abstract

    By combining poly(1,4-isoprene) (PI) with poly(ferrocenylmethyl methacrylate) (PFMMA) in a diblock copolymer structure by means of anionic polymerization we obtained narrowly dispersed PI-b-PFMMA copolymers with molecular weight ranging from 13000 to 62000 g/mol. The products were stable up to 228 °C, according to thermal gravimetry, which allowed us to further investigate their viscoelastic and X-ray scattering properties at elevated temperature by rheology and SAXS, respectively. For PI-b-PFMMA with total molecular weight 13400 g/mol a phase transition at 105 °C was identified leading to the segmental mixing at T > 105 °C and microphase separation at T <105 °C. The microphase separated morphology acquired hexahonally packed cylinder (HEX) microstructure in bulk. The explanation of the ordered HEX morphology was derived from a quantification of the thermodynamic immiscibility between PI and PFMMA segments via random phase approximation theory yielding generally accepted dependency of the Flory-Huggins interaction parameter (χ) on temperature.
    Original languageEnglish
    JournalPolymer
    Volume133
    Pages (from-to)129-136
    ISSN0032-3861
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Ferrocenylmethyl methacrylate (FMMA)
    • Flory-Huggins interaction parameter
    • Order-disorder transition
    • Poly(1,4-isoprene)
    • Rheology
    • Diblock copolymers
    • Order disorder transitions

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