Relation between strength and elastic properties of polymers

Vettegren, V. I.; Kusov, A.A.; Korzhavin, L.N.; Frenkel, S.Ya.

doi:10.1016/0032-3950(82)90285-4

Cited by 9 publications

(4 citation statements)

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“…are plotted against their d values, one finds that for the 35 polymers categorized as flexible, there exists a linear dependence of the form A cc d(9) …”

mentioning

confidence: 99%

Correlations between chain parameters and failure characteristics of polymers below their glass transition temperature

Aharoni¹

1985

Macromolecules

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“…are plotted against their d values, one finds that for the 35 polymers categorized as flexible, there exists a linear dependence of the form A cc d(9) …”

mentioning

confidence: 99%

Correlations between chain parameters and failure characteristics of polymers below their glass transition temperature

Aharoni¹

1985

Macromolecules

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“…From the gradient of the activation energy of mechanical breakdown vs the ratio of E(O)/3 the Zhurkovs school workers [62] found a number of atoms in discontinuous fluctuation of about 30, not only for polymers but also for metals and ionic crystals, while numerical theoretical calculations for a model of a linear atomic chain resulted in n ~ 20 to 30. This number of dilated chain units is about equal to the number of chain-units in the disordered domains in gel-spun hot-drawn UHMWPE fibers.…”

Section: The Tensile Strength Below 20~mentioning

confidence: 98%

“…Scientists of the Academician Zhurkov's school have tried to expand the kinetic concept of strength by formulating the phonon theory of thermal fluctuations [60,62]. The theory is based on the simultaneous consideration of the collective nature of atomic vibration, non-linearity of equations of motion and energy exchange between thermal fluctuation and medium.…”

Section: The Tensile Strength Below 20~mentioning

confidence: 99%

Temperature-dependent fracture mechanisms in ultra-high strength polyethylene fibers

Dijkstra

Torfs

Pennings

1989

Colloid & Polymer Sci

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Abstract:The influence of the temperature on the mechanical properties of gel-spun hotdrawn ultra-high molecular weight polyethylene fibers has been investigated.From these experiments two different fracture mechanisms could be distinguished.The results indicate that above 20 ~ a stress-induced orthorhombic-hexagonal phase transition is responsible for fiber failure. In the hexagonal or rotator phase the chains can easily slip past one another and fiber fracture is initiated by creep. Below 20 ~ the phase transition cannot be introduced because the stress needed for the phase transition would exceed the covalent-bond strength in the polyethylene chain. The strength temperature data of the low temperature region was treated with Zhurkov's kinetic concept, leading to a bond-fracture activation energy of 160 kJ/mol and an activation volume of 0.01 nm 3. These values, together with the data from irradiation and shrinkage experiments, indicated that in the low temperature region fiber failure might be initiated by the fracture of trapped entanglements instead of that by overstressed, taut tie molecules.

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“…About two decades ago, a two-stage mechanism of submicrocrack formation has been proposed [log]: at first, a thermal fluctuation breaks one molecule, then the remaining molecules in a given disordered region are ruptured through radical-chain reactions for a very short time. Recently [115], a new hypothesis has been put forward on the assumption of a gigantic fluctuation, which is bound to embrace the entire disordered region. In both cases fracture should occur as a microexplosion that decays at the borders of the neighbouring microfibrils.…”

Section: Drawing Arrest and Fracture Of Oriented Polymersmentioning

confidence: 99%