Investigations of the effect of viscosity of resin on the diffusion of pyrene in silicone polymer coatings using steady state fluorescence technique

Anandan, C and Basu, Bharathibai J and Rajam, KS (2004) Investigations of the effect of viscosity of resin on the diffusion of pyrene in silicone polymer coatings using steady state fluorescence technique. European Polymer Journal, 40 (2). pp. 335-342.

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    Abstract

    The diffusion phenomenon of pyrene in silicone coatings prepared from various commercial silicone resins with different viscosities was investigated using steady state excimer fluorescence technique. The amount of pyrene lost from the coatings by diffusion at different temperatures ranging from 25 to 70 ?xB0;C was estimated from the excimer emission intensity. The diffusion coefficients (D) and activation energy of diffusion of pyrene in silicone coatings were determined. It was found that the kinetic parameters of pyrene were comparable in all the four silicone coatings and independent of the viscosity of the resin. The D values were lower than those expected for pyrene in PDMS resins in the corresponding viscosity range. This may be attributed to restricted mobility of pyrene due to cross-linking of polymer chains in the cured silicone coatings. ?xA9; 2003 Elsevier Ltd. All right reserve

    Item Type: Journal Article
    Uncontrolled Keywords: Diffusion coefficient; Fluorescence; Pyrene; Silicone coatings; Activation energy; Crosslinking; Curing; Diffusion; Fluorescence; Pressure distribution; Resins; Thermal effects; Viscosity; Wind tunnels; Molecular mobility; Pressure sensitive paints (PSP); Silicone coatings;
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
    Depositing User: MS Jayashree S
    Date Deposited: 19 Nov 2004
    Last Modified: 24 May 2010 09:38
    URI: http://nal-ir.nal.res.in/id/eprint/22

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