β- and α-relaxations in poly(methyl methacrylate) and polycarbonate: non-linear anelasticity studies by antistress relaxation

Quinson, R.; Pérez, Joseph; Germain, Yves; Murraciole, J.M.

doi:10.1016/0032-3861(95)93103-s

Cited by 32 publications

(12 citation statements)

References 13 publications

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“…[32,33] A theory for nucleation of quasi-point defects with high molecular mobility [34] in glassy polymers and their coalescence into clusters (shear micro-domains) under loading was suggested in ref. [35,36] This concept is in qualitative agreement with a model of liquid-like regions [37] which treats shear micro-domains as molecular-scale lubricants accelerating cooperative motion of relaxing units. [1] Two shortcomings of this approach may be mentioned: (i) it does not distinguish the viscoelastic and viscoplastic responses of amorphous media and (ii) the model is confined to the qualitative description of anelastic deformations and it does not provide constitutive equations for the analysis of experimental data.…”

Section: Introductionsupporting

confidence: 61%

The Nonlinear Viscoelastic Response of Glassy Polymers Subjected to Physical Aging

Drozdov¹

2001

Macromol. Theory Simul.

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Section: Introductionsupporting

confidence: 61%

The Nonlinear Viscoelastic Response of Glassy Polymers Subjected to Physical Aging

Drozdov¹

2001

Macromol. Theory Simul.

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“…Subsequently, α‐activated intermolecular rearrangements are possible for the interaction of the borderline of two or more SMDs. The result is the presence of hybrid α/β‐activated states in the glassy strained matrix, which shift the lower part of the α‐relaxation peak toward lower temperatures 23. In the semicrystalline polyamide and polyesters the α relaxation coincides with the glass transition.…”

Section: Resultsmentioning

confidence: 99%

Investigation of nonelastic response of semicrystalline polymers at high strain levels

Pegoretti

Guardini

Migliaresi

et al. 2000

J. Appl. Polym. Sci.

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The nonelastic behavior at high strains of three semicrystalline polymers [i.e., nylon‐6, poly(ethylene terephthalate), and poly(ethylene 2,6‐naphthalenedicarboxylate] was investigated. For all materials, room temperature tensile strain recovery tests revealed the existence of two components of nonelastic deformation: a fast‐relaxing component (called anelastic) and a slow‐relaxing component (usually called plastic). A strain recovery master curve could be constructed for each material from the strain recovery data obtained at various temperatures. The shift factors versus temperature relationship for the strain recovery master curves allowed us to evaluate an activation energy for the nonelastic strain recovery process. These data were then compared with the activation energy for the glass‐transition process evaluated by dynamic mechanical measurements at low strain. The aim of this comparison was to investigate the influence of viscoelasticity on the nonelastic deformation recovery. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1664–1670, 2000

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“…An advantage of this model is that it can be extended to the nonlinear domain 14, 16, 19–21. The qpd theory was successfully applied to creep tests,22 compression tests at different temperatures and strain rates, on various polymers (PMMA19; linear and crosslinked PVC23, 24; amorphous PET25). Recent works permitted its adaptation to semicrystalline polymers and high strain rate tests20 and to stress antirelaxation and anelastic deformation recovery 16, 17…”

Section: Resultsmentioning

confidence: 99%

“…When the applied stressed is suppressed, the system tries to go back to the initial state, thanks to a redistribution of those populations. Quinson et al22 showed that only the anelastic deformation was responsible for this phenomenon. The defect concentration increase leads to an increase of χ and consequently to an increase in the molecular mobility according to eq 1.…”

Section: Resultsmentioning

confidence: 99%

Plasticized PVC reinforced with cellulose whiskers. II. Plastic behavior

Chazeau

Cavaillé

Pérez

2000

J. Polym. Sci. B Polym. Phys.

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In previous works, the processing of plasticized PVC reinforced by cellulose nanocrystalline whiskers has been presented, as well as its mechanical behavior in the linear viscoelastic domain. The purpose of this work is now to evaluate and model the plastic behavior of such material. Compression tests are performed in the glassy state. The “quasi‐point defect” or “qpd” theory, developed by Perez et al. and previously used for the analysis of the composite mechanical behavior in the linear domain, is now applied to the nonlinear domain to account for the matrix behavior. Then, an incremental approach, using the relationship between the matrix and the composite modulus deduced from DMA experiments, is used to predict the composite behavior by calculating the instantaneous modulus of this composite along its load path. Moreover, a simple model is introduced to account for the stress concentration created by the whiskers in the matrix. It explains the disappearance of the stress peak on the stress–strain curve at increasing whisker contents. Finally, the damage phenomena are discussed, highlighted by successive compression tests. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 383–392, 2000

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β- and α-relaxations in poly(methyl methacrylate) and polycarbonate: non-linear anelasticity studies by antistress relaxation

Cited by 32 publications

References 13 publications

The Nonlinear Viscoelastic Response of Glassy Polymers Subjected to Physical Aging

The Nonlinear Viscoelastic Response of Glassy Polymers Subjected to Physical Aging

Investigation of nonelastic response of semicrystalline polymers at high strain levels

Plasticized PVC reinforced with cellulose whiskers. II. Plastic behavior

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