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Gordeyev, Sergey; Ward, I. M.

doi:10.1023/a:1004691206113

Cited by 8 publications

(2 citation statements)

References 8 publications

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“…Basing on the experimental results the activation volume V h can be supposed weakly dependent on the temperature and in the first approximation its temperature dependence can be ignored . In this connection, eq.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Theoretical description of unconstrained thermally induced shape‐memory recovery in crosslinked polyethylenes

Kolesov

Dolynchuk

Radusch

2014

J Polym Sci B Polym Phys

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A new theoretical approach based on the modified three‐element Eyring‐Halsey model was developed for the derivation of an equation describing the thermally induced recovery of predeformed and crystallized crosslinked polymers. The proposed approach takes into account the influence of crystallizable covalent network and of entangled slipped molecular chains. Modeling of thermally induced shape‐memory (SM) recovery strain and SM recovery rate detected at constant heating rate has been successfully performed for nearly linear and two short‐chain branched polyethylenes, which were crosslinked by peroxide. The values of material constants determined by fitting agree with the estimations existing in literature. Fitting results have shown that increase of degree of branching and crosslink density accompanied with reducing crystallinity results in increasing contribution of the entangled slipped chains to the total stored SM strain. The physical sense of main fitting parameters and their dependences on the material constants such as crystallinity are discussed. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 815–822

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Section: Theoretical Backgroundmentioning

confidence: 99%

Theoretical description of unconstrained thermally induced shape‐memory recovery in crosslinked polyethylenes

Kolesov

Dolynchuk

Radusch

2014

J Polym Sci B Polym Phys

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“…Considering that ␤-PVDF has an orthorhombic unit cell composed by two repeat units -(CH 2 -CF 2 )-and that each unit cell has a volume of ∼0.108 nm 3 [28], V * is equivalent to approximately 18 carbon atoms [23]. For PE, the V * values reported in the literature may differ strongly, being less than 0.1 nm 3 [25] in some ultra-high modulus linear PEs or higher than 4 nm 3 in some oriented linear PEs [29].…”

Section: Creep Tests Along the Drawn Directionmentioning

confidence: 99%

Dynamic mechanical analysis and creep behaviour of β-PVDF films

Mano

Sencadas

Costa

et al. 2004

Materials Science and Engineering: A

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In this work, tensile dynamic mechanical analysis (DMA) was used to characterise the solid-state rheological properties of a commercial ␤-polyvinylidene fluoride (PVDF) film in the two main directions (longitudinal and transversal to the stretch direction). The ␤-relaxation, assigned to the segmental motions within the amorphous phase, is observed at ∼−25 • C. The ␣ c -relaxation is observed above room temperature.This relaxation is the main responsible for the anelastic properties of the material and to the short-term creep behaviour. Longer-term creep tests along the longitudinal direction were also performed and the Eyring model was applied, in order to characterize the flow-process within the polymeric structure. The results suggest that long-term creep is mostly controlled by the deformation of amorphous tie-chains that connect adjacent crystalline lamellae.

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