Crystal orientation and some properties of solid-state extrudate of linear polyethylene

Imada, Kenjiro; Yamamoto, Tadahiro; Shigematsu, Koji; Takayanagi, Motowo

doi:10.1007/bf00550308

Cited by 142 publications

(27 citation statements)

References 4 publications

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“…This value of E' at 140 ~ corresponds to a half crystal elastic modulus (235 GPa) measured by Xray diffraction measurement of the crystal (002) plane [23]. Furthermore, from the magnitude of tan 6 over ranges of temperature from 20 to 100 ~ the drawn specimens are elastic in comparison with the drawn polyethylene reported already.…”

Section: Resultsmentioning

confidence: 88%

Dynamic mechanical behavior of ultradrawn polyethylene films produced by gelation/crystallization from solution

Sawatari

Matsuo

1985

Colloid & Polymer Sci

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This paper is concerned with the temperature dependence of mechanical properties of ultradrawn polyethylene in terms of storage modulus E' and loss factor tan 6 by the measurement of the complex dynamic tensile modulus over ranges of temperature from 20 to 140 ~ Interestingly, E' of a specimen with drawn ratio of 300 is about 120 GPa at 140 ~ when the measurement is carried out at a frequency of 100 Hz. This is a very high value. In addition, the drawn specimens were irradiated to try to produce ultradrawn polyethylene films with more excellent mechanical and thermal properties. However, the melting peak shifts to a lower temperature with increasing radiation dose. This result is probably attributed to the considerably radiation-induced scission of extended chains constructing crystals.

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Section: Resultsmentioning

confidence: 88%

Dynamic mechanical behavior of ultradrawn polyethylene films produced by gelation/crystallization from solution

Sawatari

Matsuo

1985

Colloid & Polymer Sci

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“…The formation of radicals at the fracture of polymer chains detected by electron spin resonance [69], of microcracks during drawing and fracture derived from small angle X-ray scattering (SAXS) [70], and the calculation of the energy and fracture process during the rupture of a single chain [71][72][73] are helpful in the study of the drawing process [74]. An understanding of the high molecular alignement has been gained by raising the temperature of drawing [75][76][77], zone heating and annealing [78][79][80], extrusion [3,7,[81][82][83] the almost complete extension of the majority of chains leading to an extremely high Etl and ob II [11], and the drawing of prevalently or completely amorphous material in, for example, atactic polystyrene (aPS) [84] which forms crazes. The radial width of the wide angle X-ray scattering (WAXS) (002) peaks reveals that the crystal coherence length Lx in the axis direction is larger than L [85,86].…”

Section: Experimental Datamentioning

confidence: 99%

Drawing and extrusion of semi-crystalline polymers

Peterlin

1987

Colloid & Polymer Sci

246

194

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This review treats mainly the initial transformation of the starting unoriented lamellar material into the final oriented microfibrillar structure and its drawing. If the starting material has partially oriented shish-kebab structure the drawing is a combination of transformation of lamellae into the microfibrils and the drawing of microfibrils. The review artide is based on the literature from the last ten years and relys heavily on recent reviewing [1][2][3]. Older articles are only included if they have contributed to the basic ideas and experiments of drawing.

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“…An example of kink banding in axially compressed Kevlar* fibers is shown in Figure 1. These compressive kink bands have been observed for well-oriented polymers based on both rigid rod [1][2][3][4][5][6] and flexible [7][8][9][10][11][12][13][14][15] chains. Most of these polymers exhibit nearly linear elastic behavior in compression until the onset of kink banding.…”

Section: Introductionmentioning

confidence: 97%

“…Analyses of the compressive strengths of oriented polymers have been focused on continuum mechanics treatments of anisotropic yield behavior [11], the analysis of deformation along preferential slip planes [4,7,9,11,13,15], or dislocation models for kink formation [34]. The bulk of this work indicates that failure in compression results from shear deformation or slippage between polymer chains.…”

Section: Introductionmentioning

confidence: 99%