We present a physics-based theoretical framework to describe the transient mechanical response of polymers undergoing finite deformation. For this, a statistical description of the polymer network is provided by a distribution function that is allowed to evolve in time due to a combination of deformation and chain reconfiguration enabled by transient cross-links. After presenting the evolution law for the chain distribution function, we show that, using classical thermodynamics, one can determine how the entropy, elastic energy and true stress evolve in terms of the network configuration. In particular, we introduce the concept of distribution tensor, that enables a clean transition between the network statistics, its continuum representation and the macroscopic polymer response. In the context of Gaussian statistics, it is further shown that this tensor follows its own evolution law, enabling a simple handling of visco-elastic rubbers. The model degenerates to classical rubber elasticity when cross-links are permanent, while the case of viscous fluids is recovered for fast cross-link kinetics. The generality of the framework as well as its relevance to modeling a number of important dissipative processes occurring in polymers using a continuum approach are also discussed.

A Statistically-Based Continuum Theory for Polymers with Transient Networks / Vernerey, Franck; Rong, Long; Brighenti, Roberto. - In: JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS. - ISSN 0022-5096. - 107:(2017), pp. 1-20. [10.1016/j.jmps.2017.05.016]

A Statistically-Based Continuum Theory for Polymers with Transient Networks

VERNEREY, FRANCK;BRIGHENTI, Roberto
2017-01-01

Abstract

We present a physics-based theoretical framework to describe the transient mechanical response of polymers undergoing finite deformation. For this, a statistical description of the polymer network is provided by a distribution function that is allowed to evolve in time due to a combination of deformation and chain reconfiguration enabled by transient cross-links. After presenting the evolution law for the chain distribution function, we show that, using classical thermodynamics, one can determine how the entropy, elastic energy and true stress evolve in terms of the network configuration. In particular, we introduce the concept of distribution tensor, that enables a clean transition between the network statistics, its continuum representation and the macroscopic polymer response. In the context of Gaussian statistics, it is further shown that this tensor follows its own evolution law, enabling a simple handling of visco-elastic rubbers. The model degenerates to classical rubber elasticity when cross-links are permanent, while the case of viscous fluids is recovered for fast cross-link kinetics. The generality of the framework as well as its relevance to modeling a number of important dissipative processes occurring in polymers using a continuum approach are also discussed.
2017
A Statistically-Based Continuum Theory for Polymers with Transient Networks / Vernerey, Franck; Rong, Long; Brighenti, Roberto. - In: JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS. - ISSN 0022-5096. - 107:(2017), pp. 1-20. [10.1016/j.jmps.2017.05.016]
File in questo prodotto:
File Dimensione Formato  
JMPS_2017_163.pdf

accesso aperto

Descrizione: documento in post print
Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 29.63 MB
Formato Adobe PDF
29.63 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2827423
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 109
  • ???jsp.display-item.citation.isi??? 99
social impact