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Nonlinear time-dependent behavior of rheodictic polymers : a theoretical and experimental investigation
ID
Oseli, Alen
(
Author
),
ID
Mihelčič, Mohor
(
Author
),
ID
Šobak, Matic
(
Author
),
ID
Slemenik Perše, Lidija
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0142941824002125
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Abstract
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.
Language:
English
Keywords:
rheodictic polymers
,
nonlinear behavior
,
time-dependent mechanical properties
,
creep process
,
Schapery’s nonlinear model
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Publication date:
01.08.2024
Year:
2024
Number of pages:
11
Numbering:
Vol. 137 , art. 108535
PID:
20.500.12556/RUL-159934
UDC:
620.17:678.7
ISSN on article:
1873-2348
DOI:
10.1016/j.polymertesting.2024.108535
COBISS.SI-ID:
203185923
Publication date in RUL:
31.07.2024
Views:
171
Downloads:
43
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Record is a part of a journal
Title:
Polymer testing
Publisher:
Elsevier
ISSN:
1873-2348
COBISS.SI-ID:
23025669
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
reodiktični polimeri
,
nelinearno vedenje
,
časovno odvisne mehanske lastnosti
,
proces lezenja
,
Schaperijev nelinearni model
Projects
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
P2-0264
Name:
Trajnostni Polimerni materiali in Tehnologije
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
L-3156
Funder:
Other - Other funder or multiple funders
Funding programme:
BSH hišni aparati d.o.o. Nazarje
Project number:
L-3156
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