Mechanical properties of thermosets

Tcharkhtchi, Abbas; Faivre, S.; Roy, Le; Trotignon, J. P.; Verdú, J.

doi:10.1007/bf00687301

Cited by 36 publications

(22 citation statements)

References 10 publications

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“…From this equation, the average activation volume of the T1 system was found to be ≈1.7 nm 3 (see Figure S12, Supporting Information), which is similar to the volume of one network strand between two centers of alkyne molecules covalently linked with one azide molecule, estimated to be ≈1.2 nm 3 . Furthermore, the activation volume obtained for the T1 polymer is comparable to that found for other glassy polymers (i.e., 1.5 nm 3 for anhydride cross-linked epoxy networks, [59] 2 nm 3 for amine-cross-linked epoxy networks, [58] and 1.9 nm 3 for polycarbonates [60] ).…”

Section: Resultssupporting

confidence: 74%

Photopolymerized Triazole‐Based Glassy Polymer Networks with Superior Tensile Toughness

Han

Baranek

Worrell

et al. 2018

Adv Funct Materials

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Photopolymerization is a ubiquitous, indispensable technique widely applied in applications from coatings, inks, and adhesives to thermosetting restorative materials for medical implants, and the fabrication of complex macro-scale, microscale, and nanoscale 3D architectures via additive manufacturing. However, due to the brittleness inherent in the dominant acrylate-based photopolymerized networks, a significant need exists for higher performance resin/oligomer formulations to create tough, defect-free, mechanically ductile, thermally and chemically resistant, high modulus network polymers with rapid photocuring kinetics. This study presents densely cross-linked triazole-based glassy photopolymers capable of achieving preeminent toughness of ≈70 MJ m−3 and 200% strain at ambient temperature, comparable to conventional tough thermoplastics. Formed either via photoinitiated copper(I)-catalyzed cycloaddition of monomers containing azide and alkyne groups (CuAAC) or via photoinitiated thiol-ene reactions from monomers containing triazole rings, these triazole-containing thermosets completely recover their original dimensions and mechanical behavior after repeated deformations of 50% strain in the glassy state over multiple thermal recovery–strain cycles.

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Section: Resultssupporting

confidence: 74%

Photopolymerized Triazole‐Based Glassy Polymer Networks with Superior Tensile Toughness

Han

Baranek

Worrell

et al. 2018

Adv Funct Materials

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“…Direct measurements of Poisson's ratio has been carried out on polymeric materials by different types of experiments, in which the axial deformation was applied through a constant rate loading ramp [12][13][14][15], under a constant load (creep) [13,[16][17], under constant strain (stress relaxation) [10,14,18], or under sinusoidal loading-unloading (dynamicmechanical analysis) [19][20][21]. An accurate measurement of the transverse strains is of crucial importance and various techniques have been employed, such as optical methods (i.e.…”

Section: Introductionmentioning

confidence: 99%

Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate)

Pandini¹,

Pegoretti²

2011

Express Polym. Lett.

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Abstract. The viscoelastic nature of the Poisson's ratio of a semicrystalline poly (butylene terephthalate) is highlighted by investigating its dependence on time, temperature and strain rate, under two types of loading conditions: i) constant deformation rate tests, in which the transverse strain is measured in tensile ramps at various temperatures and at two strain rates; and ii) constant deformation tests, in which, under a constant axial deformation, the transverse strain is measured as a function of time in isothermal experiments performed at various temperatures. In both testing configurations, axial and transverse deformations are measured by means of a biaxial contact extensometer, and a correction procedure is adopted in order to compensate the lateral penetration of the extensometer knives. Poisson's ratio displays the typical features of a retardation function, increasing with time and temperature, and decreasing with strain rate. This behaviour has been compared to that of simultaneously measured relaxation modulus.

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“…Nevertheless, a marked dependence of the Poisson's ratio on strain, temperature, time, and frequency was experimentally evidenced [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Investigations were carried out by measuring Poisson's ratio both in a direct way, in which the transverse and axial deformations are concurrently measured, or in an indirect way, where Poisson's ratio is derived from the measurement of two different material's viscoelastic constants.…”

Section: Introductionmentioning

confidence: 99%

Time, temperature, and strain effects on viscoelastic Poisson's ratio of epoxy resins

Pandini

Pegoretti

2008

Polymer Engineering & Sci

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Poisson's ratio of polymeric materials, although generally assumed as a constant, is known to display a viscoelastic dependence on time, temperature, and strain. This article investigates the phenomenology of this dependence on two crosslinked epoxy systems with different glass transition temperatures. Poisson's ratio measurements are performed by contact extensometers simultaneously measuring the axial and transverse deformations under two different tensile testing conditions: (i) constant deformation rate, in which the effects of strain, strain rate, and temperature are highlighted; (ii) stress relaxation (or constant deformation), where the dependence of Poisson's ratio on time is studied at various strain levels. The viscoelastic Poisson's ratio increases as strain, temperature, and time increases, with trends markedly depending on the materials glass transition

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Mechanical properties of thermosets

Cited by 36 publications

References 10 publications

Photopolymerized Triazole‐Based Glassy Polymer Networks with Superior Tensile Toughness

Photopolymerized Triazole‐Based Glassy Polymer Networks with Superior Tensile Toughness

Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate)

Time, temperature, and strain effects on viscoelastic Poisson's ratio of epoxy resins

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