Nonlinear time-dependent behavior of rheodictic polymers : a theoretical and experimental investigation

Oseli, Alen (avtor), Mihelčič, Mohor (avtor), Šobak, Matic (avtor), Slemenik Perše, Lidija (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: rheodictic polymers, nonlinear behavior, time-dependent mechanical properties, creep process, Schapery’s nonlinear model
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Datum objave: 01.08.2024
• Leto izida: 2024
• Št. strani: 11
• Številčenje: Vol. 137 , art. 108535
• PID: 20.500.12556/RUL-159934
• UDK: 620.17:678.7
• ISSN pri članku: 1873-2348
• DOI: 10.1016/j.polymertesting.2024.108535
• COBISS.SI-ID: 203185923
• Datum objave v RUL: 31.07.2024

Gradivo je del revije

• Naslov: Polymer testing
• Založnik: Elsevier
• ISSN: 1873-2348
• COBISS.SI-ID: 23025669

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: reodiktični polimeri, nelinearno vedenje, časovno odvisne mehanske lastnosti, proces lezenja, Schaperijev nelinearni model