Dynamic mechanical properties of polyethylene single crystals

Sinnott, K. M.

doi:10.1002/pol.1965.110031112

Cited by 29 publications

(8 citation statements)

References 8 publications

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“…7). However, the β‐relaxation process usually appears in the high molecular weight polyethylene at temperatures around −20°C, it rarely and weakly exists, in some samples of linear polyethylene 28–30. Some authors have concluded that the β‐relaxation results from motions of chain units in the interfacial region28 whereas others attributed this process to the glass transition 31…”

Section: Resultsmentioning

confidence: 99%

Structure and mechanical properties of low‐density polyethylene/spherical silica nanocomposites prepared by melt mixing: The joint action of silica's size, functionality, and compatibilizer

Jeziórska

Świerz-Motysia

Zielecka

et al. 2012

J of Applied Polymer Sci

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Low‐density polyethylene/spherical silica (LDPE/SGS) nanocomposites, containing 1, 2, and 6 wt % neat and modified (having amine functional groups) silica nanoparticles, were prepared by melt mixing using a twin‐screw corotating extruder. To improve the dispersion degree of the nanoparticles, glicydyl methacrylate grafted ethylene/n‐octene copolymer (EOR‐g‐GMA) containing 0.6 wt % GMA was used as a compatibilizer. It was observed that mechanical properties such as tensile strength, Young's modulus, and impact strength increase and are mainly affected by the loading and size of silica nanoparticles as well as by the EOR‐g‐GMA. The addition of modified silica and EOR‐g‐GMA resulted in a further enhancement of mechanical properties due to the improved interfacial adhesion. Storage and loss modulus values of prepared nanocomposites measured by dynamic‐mechanical thermal analysis were sensitive to the microstructure of the nanocomposites. Higher storage and loss modulus are evidence that the nanocomposites became stiffer. By adding the modified silica and EOR‐g‐GMA further increase in storage and loss modulus were observed due to the better dispersion of silica nanoparticles and increased compatibility between silica and the LDPE matrix. Both permitted a much more efficient transfer of stress from the polymer matrix to the silica nanoparticles. The improved barrier properties of all nanocomposites can also be mentioned as a positive effect. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Resultsmentioning

confidence: 99%

Structure and mechanical properties of low‐density polyethylene/spherical silica nanocomposites prepared by melt mixing: The joint action of silica's size, functionality, and compatibilizer

Jeziórska

Świerz-Motysia

Zielecka

et al. 2012

J of Applied Polymer Sci

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“…(160) Since there is some frequency such that E a -E b =ficc, the summation extends over all a and b. The sum is, however, just the trace of the operator £ and Jo trace £ (161) Since the trace is independent of the choice of base wave functions, one can use the Zeeman wave functions to perform the calculations to obtain f°f ( u )d<*=±5wt^p±N(2I+l)».…”

Section: Thenmentioning

confidence: 99%

Molecular dynamics and structure of solids

Carter¹,

Rush²

1969

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Figure 2. A diagrammatic representation of the variation of the scattering amplitudes of the elements for (i) neutrons and (ii) x rays. The areas of the circles are proportional to the amplitude of the scattered wave: for neutrons the scale of the drawing is ten times larger than for x rays. tinguish, say, rotational disorder from a static disorder which yielded the same overall average distribution of atomic position. J. J. Rush (Na tional Bureau of Standards) : Could you comment on the relative accuracies of electron and neutron diffraction in determining hydrogen positions?G. E. Bacon: It would be reasonable to take a factor of three or four in favor of neutrons. Not only is the visibility of hydrogen relative to other atoms higher for neutrons-say by a factor of two or three in relation to a carbon atom-but also it is very much easier to interpret accurately the measured spectral intensities in terms of the structure amplitude factors of the unit cell. D. T. Goldman (National Bureau of Standards) : Could you comment on how light scattering might fit into this general picture of determination of structure by scattering techniques? G. E. Bacon: I would not expect any detail of the unit cell to be revealed by optical wavelengths, but information on particle size and texture could be forthcoming from samples of suitable transmission or reflectivity.

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“…Data for n-alkanes taken from 1lle1-s.~~ the lamellae are increasing in thiclmess, this suggests that the mechanism involves reorientation of the folds at the surfaces of the lamellae, as we have previously proposed. 16 The decrease in the magnitude of the relaxation can then be attributed to the reduction in the number of folds as the lamellae increase in thickness. The number of folds will be inversely pro-portional to the lamella thickness, so that if this hypothesis is correct, the magnitude of the OL relaxation should also be invcrsely proportional to the lamella thickness.…”

Section: A Relaxationmentioning

confidence: 99%

Mechanical Relaxations in Single Crystals of Polyethylene

Sinnott

1966

Journal of Applied Physics

Self Cite

140

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Grace and Company, Cladcsdle, M a r~l a n~ 21029 * This paper was originally published in J. A p p l . Phys., 37, 3385 (1966) and is reproduced here by kind permission of the American Institute of Physics. 14rl EXPERIMENTAL Preparation of Single CrystalsGrex 60-002E (W. R. Grace), a high density polyethylene having 1.4 methyl groups per 1000 carbon atoms, a number-average molecular weight * The accepted terminology of designating the relaxations with Greek letters in order of decreasing temperature is used. Another relaxation, the p relaxation, occurs in branched polyethylene, but this was not observed in the linear polyethylene used in the present work. A general discussion of relaxations in melt-crystallized polyethylene has been given by Boyer.6

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Dynamic mechanical properties of polyethylene single crystals

Cited by 29 publications

References 8 publications

Structure and mechanical properties of low‐density polyethylene/spherical silica nanocomposites prepared by melt mixing: The joint action of silica's size, functionality, and compatibilizer

Structure and mechanical properties of low‐density polyethylene/spherical silica nanocomposites prepared by melt mixing: The joint action of silica's size, functionality, and compatibilizer

Molecular dynamics and structure of solids

Mechanical Relaxations in Single Crystals of Polyethylene

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