Lattice modulus and crystallite thickness measurements in ultra-high modulus linear polyethylene

Clements, J.; Jakeways, R.; Ward, I. M.

doi:10.1016/0032-3861(78)90116-7

Cited by 143 publications

(39 citation statements)

References 10 publications

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“…one would expect a steep increase of the "long spacing" in the small-angle scattering with increasing draw ratio. This is, however, not observed, the long period for hot drawn samples does not change significantly with the draw ratio [9,10,11,14].…”

Section: ~ ~ [Gpo-7]mentioning

confidence: 87%

“…In table 2 the /-oo2 values and the SAXS long period reported by Ward et al [14] for a PE sample with a molecular weight of M~ = 101450 are listed together with the thickness dc of the crystalline lamellae calculated with the assumption VcM ----0,6 = const and vr values estimated from the result of the.present work for a sample with comparable molecular weight. The Lr values obtained in this way do not change much with ;t and are about 5-6 times larger than the d c (= LL) values.…”

Section: Lr= ~mentioning

confidence: 96%

“…In this context it is of interest to examine the results obtained by Ward et al [14] from measurements of the (002) line profiles. They observed that the apparent crystallite size in the direction of the c-axis computed from the (002) line broadening is larger than the thickness of crystalline lamellae calculated from the long spacing of the SAXS curves.…”

Section: Small-angle X-ray Scatteringmentioning

confidence: 98%

“…The relationship between structure and tensile modulus has been based on the concept of fibrils of finite length in a matrix of lower modulus (shear lag model [11,12] or on a modified Takayanagi-model in which the modulus of the amorphous regions is increased by intercrystalline bridges [13,14].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure and properties of ultra-high modulus polyethylene

Fischer

Haschberger

Ziegeldorf

et al. 1982

Colloid & Polymer Sci

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Section: ~ ~ [Gpo-7]mentioning

confidence: 87%

Section: Lr= ~mentioning

confidence: 96%

Section: Small-angle X-ray Scatteringmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure and properties of ultra-high modulus polyethylene

Fischer

Haschberger

Ziegeldorf

et al. 1982

Colloid & Polymer Sci

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“…As seen, the coefficients of thermal expansion are found to be negative over the whole temperature range of the experiment, consistent with the data obtained previously for solid-state extruded, extended chain PE.17-19 Such behavior of P E fibers is due to the presence of a considerable amount of macromolecular chains that are highly oriented along the fiber axis, forming socalled continuous crystals. [20][21][22] This supermolecular structure, together with the negative thermal expansion in the c -axis (chain direction) of PE crystals, 1723 led to contraction in the direction parallel to orientation.…”

Section: Methodsmentioning

confidence: 98%

Polyethylene fibers‐polyethylene matrix composites: Preparation and physical properties

Teishev

Incardona

Migliaresi

et al. 1993

J of Applied Polymer Sci

110

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SYNOPSISDrawing on the difference in melting points of UHMPE fiber (150°C) and HDPE matrix ( 13OoC), single-polymer composites were fabricated under various processing conditions. Because of the chemical similarity of the composite components, good bonding a t the fibermatrix interface could be expected. The matrix, the fiber, and unidirectional composite laminae were studied using TMA and DSC analyses, a hot-stage crystallization unit attached to a polarizing microscope, and an universal tensile testing machine. The TMA showed negative thermal expansion of the fiber over the complete temperature range of the experiment. Three regimes of contraction according to the values of the thermal expansion coefficient were detected. DSC analyses of either the fiber or the composite specimens did not show any appreciable changes after various thermal treatments. They also showed no evidence of fiber relaxation during manufacture, probably because of the pressure-related transverse constraint. The tensile strength and modulus values of the composite appeared to be fairly high and close to those reported for other composites reinforced with polyethylene ( P E ) fibers. An apparent maximum on the temperature dependencies of tensile properties was observed. A study of the matrix microstructure did not give any proof of transcrystalline growth at the fiber-matrix interface even for chemical or plasma surface-treated fibers.

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Semicrystalline Polymers

Cheng

2002

Encyclopedia of Polymer Science and Technology

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Semicrystalline polymers often show a spherulitic morphology, consisting of a radial assembly of twisted crystalline lamellae and amorphous layers. A multiscale numerical model is used to investigate the mechanics of intraspherulitic deformation of polyethylene. The model establishes links across the microscopic, the mesoscopic, and the macroscopic levels. Constitutive properties of the material are identified for the crystallographic and amorphous domains. The averaged fields of an aggregate of individual phases, having preferential orientations, form the constitutive behavior of intraspherulitic material. The spherulitic macrostructure is described by finite element models. The macroscopic stress -strain response resembles that of a previous random polycrystalline model. However, the current model includes the geometrical effect of the anisotropic structure within a spherulite, causing strain concentrations in the centers, which spread out in the equatorial region for uniaxial loading conditions and in inclined directions for plane strain loading. The deformations are linked to microstructural processes as interlamellar deformation and intralamellar crystallographic slip.

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Lattice modulus and crystallite thickness measurements in ultra-high modulus linear polyethylene

Cited by 143 publications

References 10 publications

Structure and properties of ultra-high modulus polyethylene

Structure and properties of ultra-high modulus polyethylene

Polyethylene fibers‐polyethylene matrix composites: Preparation and physical properties

Semicrystalline Polymers

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