Akademska digitalna zbirka SLovenije - logo
ALL libraries (COBIB.SI union bibliographic/catalogue database)
  • Nonlinear time-dependent behavior of rheodictic polymers [Elektronski vir] : a theoretical and experimental investigation
    Oseli, Alen ...
    The present study examined the nonlinear time-dependent behavior of rheodictic polymers, a class of noncrosslinked materials that exhibit flow. Such behavior was addressed with extended Schapery’s ... nonlinear viscoelastic model by introducing new physical quantities, i.e., the flow term and corresponding nonlinear shift parameter . While portrays irrecoverable deformation, depicts a nonlinear contribution to flow acceleration. This theory was accompanied by analytical and experimental methodologies for identifying all the parameters in the linear and nonlinear viscoelastic domains. Predictions of long-term time-dependent behavior (in shear) at various stress states show excellent agreement with the experimental data, i.e., within error, obtained for polycarbonate at . Surprisingly, the newly introduced indicates that flow retardation occurs with increasing stress, implying that a highly deformed entangled system hinders molecular reptation/disentanglement. Nevertheless, the proposed extension of Schapery’s nonlinear viscoelastic model not only allows accurate predictions of the nonlinear time-dependent behavior of rheodictic polymers but also enables a detailed outlook on the underlying molecular mechanisms under severe environmental and loading conditions.
    Source: Polymer testing [Elektronski vir]. - ISSN 1873-2348 (Vol. 137 , [article no.] 108535, Aug. 2024, str. 1-11)
    Type of material - e-article ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 203185923

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S0142941824002125
    DOI

Shelf entry