Dynamic light scattering study on a bimodal end-linked polydimethylsiloxane network structure

Hidetoshi Oikawa

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    26 Citations (Scopus)

    Abstract

    The cooperative diffusion coefficient Dcoop and the normalized variance μ2 \ ̄qG-2 for bimodal end-linked polydimethylsiloxane (PDMS) networks were determined by means of dynamic light scattering (DLS) measurements. Dcoop was proportional to polymer weight concentration at the equilibrium state of swelling Ce to the power of 0.88, which was larger than the theoretical exponent, compared with the unimodal PDMS networks. Further, the value of μ2 \ ̄qG-2 at the lowest Ce was greater than that of the corresponding bimodal PDMS solutions in the semidilute regime, and the autocorrelation function of DLS could be reproduced by a double-exponential fitting. These facts suggested a spatially and compositionally heterogeneous structure of bimodal PDMS networks, especially in the case of the lowest Ce.

    Original languageEnglish
    Pages (from-to)1116-1119
    Number of pages4
    JournalPolymer
    Volume33
    Issue number5
    DOIs
    Publication statusPublished - 1992

    Keywords

    • bimodal network
    • dynamic light scattering
    • polydimethylsiloxane

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics
    • Materials Chemistry

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