Viscoelastic Behavior of Scarcely Crosslinked Poly(dimethyl siloxane) Gels : 2. Effects of Sol Component and Network Strand Length

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Abstract

Linear viscoelastic behavior was examined for poly(dimethyl siloxane) (PDMS) gels scarcely crosslinked through the double-liquid reaction. The gel sample after the sol extraction exhibited the fast and slow relaxation processes characterized with the power-law behavior of the dynamic loss modulus, <i>G"</i> ∝ω<sup>0.5</sup> and <i>G"</i> ∝ω<sup>0.8</sup> at high and low angular frequencies ω. The fast relaxation was essentially the same as that in the gel before the sol extraction and attributed to the constraint release (CR)-Rouse relaxation of individual gel strands having a considerable length distribution. In contrast, the slow relaxation, being related to cooperative CR involving neighboring gel strands, appeared to become faster after the sol extraction than before. This puzzling result may have reflected a spatial heterogeneity of the crosslinking density, although this hypothesis has not been proven yet. For the as-prepared PDMS gels containing the sol chains, an increase of the crosslinking density was found to extend the CR-Rouse relaxation tail to low frequencies compared to the more scarcely crosslinked strands after the sol extraction. Thus, the CR motion of the strands appeared to be more strongly affected by the crosslinking density than by the sol chains.<br>

Journal

  • Nihon Reoroji Gakkaishi

    Nihon Reoroji Gakkaishi 35(4), 191-198, 2007-09-15

    The Society of Rheology, Japan

References:  14

Cited by:  1

Codes

  • NII Article ID (NAID)
    10029818255
  • NII NACSIS-CAT ID (NCID)
    AN00198812
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    03871533
  • NDL Article ID
    8948268
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z14-725
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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