Structural changes during deformation of polyvinylidenefluoride

Kosmynin, B.P.; Gal'perin, Ye.L.; Tsvankin, D.Ya.

doi:10.1016/0032-3950(70)90074-2

Cited by 17 publications

(11 citation statements)

References 8 publications

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“…1. Previous studies [7,8] have shown that the relative contents of e-phase and fl-phase crystals in drawn samples vary with the temperature at which the deformation occurs. Fig.…”

Section: 1 Mechanical Propertiesmentioning

confidence: 99%

“…At high drawing temperatures oriented e-phase is 0022-2461/89 $03.00 + . 12 9 1989 Chapman and Hall Ltd. obtained up to these draw ratios, and it is only by drawing the material further that oriented /?-phase becomes the dominant phase [8][9][10].…”

Section: Introductionmentioning

confidence: 97%

“…Previous studies showed that the drawing temperature determines the relative contents of e-and /?-phase crystals in the drawn samples [7,8]. At low draw temperatures, from about 80 to 100 ~ transformation of a-phase to oriented/?-phase readily occurs at draw ratios up to 400% engineering strain.…”

Section: Introductionmentioning

confidence: 98%

“…phase was detected at the deformation stage where necking was initiated at the centre of their tensile samples. Most of the studies of the e-phase to/?-phase transformation during deformation have been by X-ray diffraction [7][8][9][10][11] and infrared spectroscopy [9,12,13]; only a few studies [12,14,15] of the stress-induced e ~ /? phase transformation have been done by electron microscopy and electron diffraction.…”

Section: Introductionmentioning

confidence: 99%

“…The objective of this research is to characterize the deformation mechanisms of PVF2 during deformation, in both thin films (~ 100 nm thick) and thick films (~ 1 mm thick). Because a phase transformation accompanies the deformation of PVF2 and the resulting crystal structure is dependent on the temperature at which the deformation occurs [7][8][9][10][11], samples deformed at different temperatures were studied by electron microscopy and wide-(WAXD) and small-(SAXD) angle X-ray diffraction in order to understand better the morphological aspects of the e --* /? tranformation during deformation.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and transformation mechanisms of poly(vinylidene fluoride) (PVF2)

Hsü

Geil

1989

J Mater Sci

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The deformation process and the accompanying ~ -~ /~ phase transformation of poly(vinylidene fluoride), drawn at 82 to 90 and 130 ~ has been characterized by electron microscopy and X-ray and electron diffraction. Micronecking occurs at both draw temperatures, fibrils and mosaic blocks being drawn off the edges of the micronecks. The degree of phase transformation, at the same elongation, is dependent on the draw temperature; at 130 ~ C the majority of the sample remains in the c~ phase at the natural draw ratio. The phase transformation at both draw temperatures accompanies the transformation from lamellar (block) structure to fibril.

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“…1. Previous studies [7,8] have shown that the relative contents of e-phase and fl-phase crystals in drawn samples vary with the temperature at which the deformation occurs. Fig.…”

Section: 1 Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Deformation and transformation mechanisms of poly(vinylidene fluoride) (PVF2)

Hsü

Geil

1989

J Mater Sci

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Processing–property interactions in poly(vinylidene fluoride). II. Morphology and property characterization of extruded films

Khomami

McHugh

1988

J of Applied Polymer Sci

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SynopsisThe effects of flow history, processing temperature, and exit draw ratio have been studied for a poly(vinylidene fluoride) resin. Quantification of the stress fields and flow kinematics were described in Part I while, in this publication, attention has been addressed to the evaluation of f i l m properties. Hot-stage and differential scanning colorimetry (DSC) analyses were used to characterize the thermal behavior; polarized light optical microscopy and electron microscopy were used to characterize the morphology; Fourier transform infrared (ITIR) and wide-angle x-ray scattering (WAXS) were used to evaluate crystal structure; and mechanical testing was used to evaluate tensile properties. Extensional melt stresses on the order of 1.4 X lo6 dyne/cm2 were necessary to induce row-nucleated crystallization in undrawn samples, and in all cases, preorientation of the melt by extensional flow enhanced the efficiency of the a --f /3 transformation with drawing. The various transformations on drawing were as follows: unoriented a to oriented superheatable a phase for draw ratio (DR) < 5; transformation from a to /3 phase for 5 < DR I 25; transformation to more highly oriented a and /3 phases, DR > 25.

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The production and properties of poly(vinylidene fluoride) rods oriented by drawing through a conical die

Richardson¹,

Hope²,

Ward³

1983

J. Polym. Sci. Polym. Phys. Ed.

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SynopsisHighly oriented poly(viny1idene fluoride) rods have been produced by drawing isotropic polymer through a conical die. A range of oriented products was obtained, depending on the drawing temperature and the deformation ratio achieved. At low draw temperatures the draw ratio and final modulus are comparatively low, hut a high Form I crystal content is obtained. A t high draw temperatures the Form I content varies greatly with draw ratio, reaching high values a t large draw ratios, where the highest-modulus samples were obtained.

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Structural changes during deformation of polyvinylidenefluoride

Cited by 17 publications

References 8 publications

Deformation and transformation mechanisms of poly(vinylidene fluoride) (PVF2)

Deformation and transformation mechanisms of poly(vinylidene fluoride) (PVF2)

Processing–property interactions in poly(vinylidene fluoride). II. Morphology and property characterization of extruded films

The production and properties of poly(vinylidene fluoride) rods oriented by drawing through a conical die

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