Vibration Damping Characterization of Linseed oil based Elastomers for its Effectiveness to Attenuate Structural Vibration

Journal of Applied Polymer Science (Impact Factor: 1.4). 06/2013; DOI: 10.1002/app.39607

ABSTRACT Vibration damping properties of elastomers prepared from linseed oil were characterized by Dynamic mechanical analyzer (DMA) in a temperature range of -50 to 100 oC and frequency range of 5Hz to 1 kHz. The maximum damping loss factor, varies from 0.78 to 1.32, the room temperature (25 oC) loss factor, in the range of 0.56 to 1.08 and the temperature range ( ) for effective damping ( 0.3) varies from 63 oC to 74.4 oC in different elastomers. The elastomers behave as a good vibration damper both in lower and higher frequency range. Thus these elastomers exhibit good damping behaviour in a wide range of temperature and frequency, a primary requirement for practical damping applications. A modal constrained layer damping system (CLD) constructed utilizing these elastomers exhibits its potentiality to attenuate structural vibrations with respect to mild steel bare plate resonator under laboratory fabricated testing methodology.

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    ABSTRACT: A low cost experimental setup has been fabricated for evaluation of vibration damping properties of a variety of elastomers developed from linseed oil. Free and forced vibration principles were utilized in this experimental setup. Under forced vibration, the shear loss factor varies from 0.37 to 1.03 at 2nd bending vibration mode and 0.43 to 0.99 at 3rd bending vibration mode for different elastomers. The loss factor varies from 0.52 to 0.94 under free vibration. The loss factors determined by both forced and free vibration techniques are in good agreement with the loss factors obtained from dynamic mechanical analysis. The ultimate tensile strength and Young’s modulus of the elastomers varies from 0.37 to 3.71 MPa, 0.27 to 10.27 MPa, respectively, whereas these properties in compression are in the range of 3.1 to 72.9 MPa and 1.5 to 30.1 MPa, respectively. Thus, these elastomers are mechanically stable for vibration damping applications.
    ISRN Polymer Science. 01/2014;
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    ABSTRACT: The microbial synthesis of environment-friendly poly(3-hydroxybutyrate –co-3-h yd r ox yv al er a te ) , PH B V, ha s be en p er f or m ed by us in g an al k al i ph il i c m ic r o org an is m , Alkaliphilus oremlandii OhILAs strain (GenBank Accession number NR_043674.1), at pH 8and at atemperature of30 –32 °C through the biodegradation of linseed oil-based elastomer. The yield of the copolymer on dry cell weight basis is 90 %. The elastomers used for the biodegradation have been synthesized by cationic polymerization technique. The yield of the PHBV copolymer also varies with the variation of linseed oil content (30 –60 %) in the elastomer. Spectroscopic characterization ( 1 H NMR and FTIR) of the accumulated product through biodegradation of linseed oil-based elastomers indicates that the accumulated product is a PHBV copolymer consisting of 13.85 mol% of 3-hydroxyvalerate unit. The differential scanning calorimetry (DSC) results indicate a decrease in the melting ( T m ) and glass transition te mper atu re ( T g ) of PHBV copolymer with an increase in the content of linseed oil in the elastomer, which is used for the biodegradation. The gel permeation chromatography (GPC) results indicate that the weight average molecular weight ( Mw ) of PHBV copolymer decreases with an increasing concentration of linseed oil in the elastomer. The surface morphology of the elastomer before and after biodegradation is observed under scanning electron microscope (SEM) and atomic force microscope (AFM); these results indicate about porous morphology of the biodegraded elastomer.
    Applied Biochemistry and Biotechnology 08/2014; · 1.89 Impact Factor


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May 31, 2014