The influence of supermolecular structure on the strength and deformation characteristics of linear polyethylene

Marichin, V. A.; Miasnikova, L. P.; Sutchkov, V. A.; Tuchvatullina, M. Sh.; Novak, I. I.

doi:10.1002/polc.5070380115

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…The diameter of spherulites is the only structural feature that differentiates these films from all other films (1-5 µm against 15-20 µm). In accordance with the numerous experimental data (e.g., [24][25][26][27]), the small spherulitic structure of the samples presupposes higher parameters of flowability and ultimate stress than the large spherulitic structure. The spherulitic shape however is the most widely spread shape of supramolecular structures of unoriented semicrystal line polymers crystallized from melt or a weakly dilute solution [28], albeit far from the only shape.…”

Section: Spherulites and Mechanics Of Compositessupporting

confidence: 64%

Effect of fullerene C60 on the structure and mechanical properties of thin films based on poly(methylmethacrylate) and other carbochain vinyl polymers: A technological aspect

et al. 2012

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The effect of fullerene C 60 on the structure and mechanical properties of poly(methyl methacry late) films are studied via the methods of X ray diffraction, mechanics, and optical and atomic force micros copy. The findings of this study are verified with the use of the data obtained for amorphous and semicrystal line samples of other polymers, primarily carbochain polymers of the vinyl series, such as polyethylene, polypropylene, and polystyrene.

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Section: Spherulites and Mechanics Of Compositessupporting

confidence: 64%

Effect of fullerene C60 on the structure and mechanical properties of thin films based on poly(methylmethacrylate) and other carbochain vinyl polymers: A technological aspect

et al. 2012

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The influence of structure and processing conditions on engineering mechanical properties in bulk crystallized isotactic polypropylene

Reinshagen

Dunlap

1976

J of Applied Polymer Sci

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SynopsisA study of the influence of processing conditions and structure on engineering mechanical properties was conducted in bulk isotactic polypropylene. The influence of one processing parameter, undercooling, defined so as to account for both pressure and temperature effects, was particularly studied.Improved mechanical properties were found with increased undercooling. At low undercoolings, brittle failure without yield occurred, presumably the result of a sparsity of intercrystalline links under these conditions. ' As undercooling was increased, failure occurred after yielding as failure stress elevated dramatically, apparently because of greater link density. A modest improvement in yield stress with increased undercooling was attributed to the increasingly crosshatched lamellar structure produced at higher undercoolings, a structural trend confirmed by electron microscopy.Spherulite size, varied by altering melt history (melt temperature and time at melt temperature) at constant undercooling, was found to have no effect on engineering yield stress. This result indicates that apparent yield stress-spherulite size effects found by several earlier investigators were probably caused by structural variations other than spherulite size.

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Structural aspects of mechanical destruction of oriented polymers

Marikhin

1984

Makromol. Chem.

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-The relation between the structure and meckmnlcal fracture of oriented polymers is discussed. The fracture behaviour originates from the structural heterogeneity of polymers, i . e . , the presence of nicro-and macrofibrils, alternating crystalline and disordered (amorphous) regions along microfibrils etc. The fracture behaviour of polymers is analyzed in terms of the kinetic thermal-fluctuation concept O f strength of solids. The phonon mechanism of nucleation of the breaking thermal fluctuations in disordered regions of microfibrils is discussed. A Critical role played by kink band formation in the appearance of localized submicro-and microcracks is elucidated. The mechanism of propagation of the main crack is revealed through studies of the electron microscopic fractograms from the rupture surfaces of fibers. The need for an analysis of the polymer fracture in terms of the nonequilibrium system' theory is emphasized.The study of basic laws governing mechanical fracture Of oriented polymers is extremely important both for scientific researoh and practical applications. Since high-strength, highly oriented cord fibers, monofilaments, oriented films are now produced industrially at the rate of many millions of tons per year, a further Improvement of the mechanical performance of these materials is a burnin problem. garded as relatively well-defined one-dimensional systems which represent a suitable model object for studying the fracture behaviour at the molecular and supermolecular levels of polymer architecture.There are several currently available techniques for preparation of oriented polyners. They include orientation drawi y , high pressure extrusion, crystallization from dilute solu ions under shear etc. (Refs. 1-3). mers obtained by these techniques can differ appreciably (Refs. 1-31, which is sure to affect their behaviour during mechanical fracture.The most widely used method of mass production of oriented polymers is an orientation drawin from the solid unoriented state. The structure of the oriented polymers thus obtained has proven a matter of considerable controvers (Befs.1,3,4). Analysis of the available data reveals (Ref. 4y the existence of two levels of heterogeneity in the supermolecular organization, i.e., macrofibrils and microfibrils. the polymer bulk distinquishable by electron microscopy and X-ray diffraction. These are fiber-like formations several On the other hand, highly orienfed polymers can be reIt is worth noting that the structure of oriented polyMicrofibrils (Rlg.1) are minor supermolecular elements in

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The influence of supermolecular structure on the strength and deformation characteristics of linear polyethylene

Cited by 5 publications

References 4 publications

Effect of fullerene C60 on the structure and mechanical properties of thin films based on poly(methylmethacrylate) and other carbochain vinyl polymers: A technological aspect

Effect of fullerene C60 on the structure and mechanical properties of thin films based on poly(methylmethacrylate) and other carbochain vinyl polymers: A technological aspect

The influence of structure and processing conditions on engineering mechanical properties in bulk crystallized isotactic polypropylene

Structural aspects of mechanical destruction of oriented polymers

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