Morphology of highly textured high-density polyethylene

Song, H. H.; Argon, A. S.; Cohen, Robert E.

doi:10.1021/ma00205a030

Cited by 57 publications

(49 citation statements)

References 8 publications

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“…The above described features are characteristic for a singlecomponent texture similar to that observed in the plain HDPE deformed at the same conditions. 4,12 One can note, however, that with increasing the content of the SEBS in the blend, the texture of the crystalline phase is less developed [maxima observed in (200) and (020) pole figures are lower]. Moreover, it tends to transform from a single component to a fiber-like texture at a higher concentration of the copolymer in the blend.…”

Section: Deformation Of a Blend By Plane-strain Compressionmentioning

confidence: 99%

Ternary blends of high-density polyethylene-polystyrene-poly(ethylene/butylene-b-styrene) copolymers: Properties and orientation behavior in plane-strain compression

Bartczak

Gałęski

Pluta

2000

J. Appl. Polym. Sci.

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Ternary blends of high-density polyethylene (HDPE) with atactic polystyrene (PS) and styrene-ethylene/butylene-styrene block copolymer (SEBS) were deformed by plane-strain compression in a channel die. The samples were deformed up to the true strain of 1.8 (compression ratio of 6) at 100°C. Thermal and mechanical properties of the deformed blends were studied in addition to the study of the deformation process. The basic mechanism of plastic deformation is crystallographic slip, the same as that active in deformation of plain HDPE and binary blends of HDPE and PS. This slip is supplemented by the plastic deformation of an amorphous component. In blends of high SEBS content, the role of deformation of an amorphous component by shear and flow increases markedly due to reduced overall crystallinity of these blends. In such blends an amorphous component includes a semicontinuous embedding of crystallites, and therefore, the deformation process is dominated by deformation mechanisms active in a more compliant amorphous phase. Consequently, with increasing the content of SEBS in the blend, the texture of the oriented blends changes from a single-component (100) [001] texture to a texture with a strong fiber component in addition to a (100)[001] component. In blends with high content of SEBS, the crystalline lamellae of polyethylene do not undergo fragmentation up to the compression ratio of 6, while in blends with low and moderate content of SEBS, such lamellar fragmentation was detected.

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Section: Deformation Of a Blend By Plane-strain Compressionmentioning

confidence: 99%

Ternary blends of high-density polyethylene-polystyrene-poly(ethylene/butylene-b-styrene) copolymers: Properties and orientation behavior in plane-strain compression

Bartczak

Gałęski

Pluta

2000

J. Appl. Polym. Sci.

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“…The results presented here pose new challenges to the modeling efforts reported in current literature [10][11][12][13][19][20][21][22][23][24][25]. As described earlier, previously reported models predict the formation of the (001) fiber component (with a slight misalignment in some cases); they do not predict the formation of either the near-(011) component or the weaker (010) component.…”

Section: Discussionmentioning

confidence: 67%

“…These can produce large unloading strains, especially in tensile loaded samples, and potentially cause significant changes in the underlying texture in the sample. Therefore, the textures reported in previous studies [10][11][12][13][14][15]19,[22][23][24] correspond to "deformed and relaxed" textures in the samples, and may not represent accurately the "deformation only" texture in the sample.…”

Section: Introductionmentioning

confidence: 91%

“…Deformation textures have been measured in HDPE in a number of deformation modes including uniaxial tension [10,[13][14][15][16][17][18], uniaxial compression [11,[19][20][21][22], biaxial extension [23] and simple shear [24]. Texture evolution in each of these cases exhibits a complex path suggesting that different mechanisms of deformation are prevalent in the material at different ranges of imposed strain in any particular mode of deformation.…”

Section: Introductionmentioning

confidence: 99%

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Crystallographic texture evolution in high-density polyethylene during uniaxial tension

Garmestani

Kalidindi

et al. 2001

Polymer

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This paper presents experimental measurements of crystallographic texture evolution in high-density polyethylene subjected to very large strains in uniaxial tension (up to a true strain of 2.1). The measurements presented here differ from prior studies in three important aspects: (1) The initial texture in the sample is quite strong with a large fraction of the crystallites oriented in an unstable orientation with the crystal caxis perpendicular to the tensile axis of the sample. (2) Rigorous methods of texture analyses, based on spherical harmonics, have been applied to produce "complete, recalculated" pole figures based on diffraction data from five incomplete pole figures. (3) The measurements were performed while the samples were kept in the deformed state. The results presented here provide several new insights into texture development in tensile straining of high-density polyethylene to large strains. There are at least three distinct preferred orientations: (i) a component with (001) aligned along the extension axis, (ii) a component with (011) aligned close to the extension axis, and (iii) a component with (010) aligned along the extension axis. Note that only the first component has been reported to be stable at high strains in previous studies. The rate of texture evolution in the present study is significantly lower than that reported in previous studies. It was also observed that the natural relaxation of strain following the tensile loading had a significant impact on the texture in the sample. It was observed that the relaxation process mitigated or eliminated the second and third preferred texture components described above, while strengthening the first. ᭧

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“…Different studies have explored deformation at temperatures above and next to the glass transition temperature (T g ), however below the fusion temperature (T m ). Detailed investigations of the mechanisms of plastic deformation have been reported by Cohen et al [12][13][14] for semi-crystalline polymers as nylon, poly-(ethylene terephthalate) (PET) and high density polyethylene (HDPE). In general forms, microstructural changes in the levels of spherulites, lamella and amorphous phase [15][16][17] have been observed.…”

Section: Introductionmentioning

confidence: 99%

Large Plastic Deformation of Isotactic Poly(propylene) (iPP) Evaluated by WAXD Techniques

Samios

Tokumoto

Denardin

2005

Macromolecular Symposia

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Summary: Commercial isotactic poly(propylene) (iPP), obtained in bars, was annealed and submitted to different levels of plastic deformation by uniaxial plane compression using a special device which permits well controlled temperature and strain rate. The evolution of the microstructure was followed at different degrees of deformation by wide angle x-ray diffraction (WAXD) techniques. The spherulite fragmentation process, lamellar orientation and destruction of the crystallites is argued, according to collected analytical data in the flow direction (FD), the loading direction (LD) and the lateral or constrain direction (CD). The evaluation of the WAXD patterns in terms of diffraction line position, intensity and width, permits to affirm that, while the large plastic deformation occurs, the crystalline net suffers anisotropic deformation, the crystallites become preferentially oriented along the flow direction and the crystalline phase diminish in amount indicating lesser and smaller crystallites. The gradual lamellae fragmentation occurs, starting with apparent crystalline size of approximately 30 nm for the non-deformed material and gradually decreasing to approximately 15 nm for the 70% deformed one.

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Morphology of highly textured high-density polyethylene

Cited by 57 publications

References 8 publications

Ternary blends of high-density polyethylene-polystyrene-poly(ethylene/butylene-b-styrene) copolymers: Properties and orientation behavior in plane-strain compression

Ternary blends of high-density polyethylene-polystyrene-poly(ethylene/butylene-b-styrene) copolymers: Properties and orientation behavior in plane-strain compression

Crystallographic texture evolution in high-density polyethylene during uniaxial tension

Large Plastic Deformation of Isotactic Poly(propylene) (iPP) Evaluated by WAXD Techniques

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