Molecular-weight dependence of morphology and mechanical properties of ultrahigh-molecular-weight polyethylene gel films

Ogita, Tetsuya; Yamamoto, Ryō; Suzuki, Nobuyasu; Ozaki, Fumihiko; Matsuo, Masaru

doi:10.1016/0032-3861(91)90506-e

Cited by 38 publications

(36 citation statements)

References 25 publications

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“…Films of UHMWPE could be elongated up to 400 times, where the corresponding Young's modulus reached 216 GPa, when the gels were prepared from solutions with the optimum concentration. [3][4] This value is close to the ultimate value corresponding to the crystal lattice modulus (220-235 GPa) along the chain direction, as measured by X-ray diffraction at room temperature. [3,5] One of the more serious problems…”

Section: Introductionmentioning

confidence: 58%

Morphology and High Modulus of Laminated Ultra‐Drawn Polyethylene Films with Biaxial Orientation Prepared by Microwave Heating

Azuma

Chen

Nakano

et al. 2007

Macro Materials & Eng

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To improve the poor mechanical properties of uniaxially ultra‐drawn films along the transverse direction, lamination of two ultrahigh molecular weight polyethylene/ethylene dimethylaminoethyl methacrylate copolymer blend films was carried out in the rectangular elongation direction by a microwave heating method. The characteristics of the successful laminated films were analyzed theoretically and experimentally. The original orientation of the crystallites for the blend films was maintained perfectly after lamination, and the preferential directions intersected each other. The Young's modulus increased symmetrically with respect to the 45 ° direction. This is the first report concerning a drastic improvement of the Young's modulus in the transverse direction for films ultra‐drawn along one direction.magnified image

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Section: Introductionmentioning

confidence: 58%

Morphology and High Modulus of Laminated Ultra‐Drawn Polyethylene Films with Biaxial Orientation Prepared by Microwave Heating

Azuma

Chen

Nakano

et al. 2007

Macro Materials & Eng

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“…When the gel solutions are at the critical concentration, they can be regarded as containing the correct level of entanglements between the UHMWPE crystal lamellae. [41][42][43] These entanglements play an important role in the transmission of the drawing force because they act as intermolecular cross-linkers. As shown in Figure 4, the maximum draw ratio achievable at different compositions of a low molecular-weight polymer decreases with the increasing content of low molecular weight polymer.…”

Section: Resultsmentioning

confidence: 99%

Ultra-drawing of gel films of ultra high molecular weight polyethylene/low molecular weight polymer blends containing BaTiO3 nanoparticles

et al. 2006

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The ultra-drawing process of an ultra high molecular weight polyethylene (UHMWPE) gel film was examined by incorporating linear low-density polyethylene (LLDPE) and BaTiO 3 nanoparticles. The effects of LLDPE and the draw ratios on the morphological development and mechanical properties of the nanocomposite membrane systems were investigated. By incorporating BaTiO 3 nanoparticles in the UHMWPE/LLDPE blend systems, the ultra-drawing process provided a highly extended, fibril structure of UHMWPE chains to form highly porous, composite membranes with well-dispersed nanoparticles. The ultra-drawing process of UHMWPE/LLDPE dry-gel films desirably dispersed the highly loaded BaTiO 3 nanoparticles in the porous membrane, which could be used to form multi-layered structures for electronic applications in various embedded, printed circuit board (PCB) systems.

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“…The crystal dispersion (a-transition) of polyethylene has been reported to consist of two or more relaxation mechanisms [38,39]. The resolution of the a-transition into two components was first reported by Nakayasu et al [40] for melt-crystallized polyethylene.…”

Section: Viscoelastic Properties Of Ultradrawn Polyethylenementioning

confidence: 99%

“…Unfortunately, it was impossible to estimate experimentally the form birefringence effect. Thus, a model is proposed as shown in Figure 10 to analyze the form birefringence effect [39]. In this model system, oriented crystallites are surrounded by amorphous phases.…”

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confidence: 99%

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Intrinsic Anisotropy of Highly Oriented Polymeric Systems in Relation to Molecular Orientation and Crystallinity

Matsuo¹

1996

Oriented Polymer Materials

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Molecular-weight dependence of morphology and mechanical properties of ultrahigh-molecular-weight polyethylene gel films

Cited by 38 publications

References 25 publications

Morphology and High Modulus of Laminated Ultra‐Drawn Polyethylene Films with Biaxial Orientation Prepared by Microwave Heating

Morphology and High Modulus of Laminated Ultra‐Drawn Polyethylene Films with Biaxial Orientation Prepared by Microwave Heating

Ultra-drawing of gel films of ultra high molecular weight polyethylene/low molecular weight polymer blends containing BaTiO3 nanoparticles

Intrinsic Anisotropy of Highly Oriented Polymeric Systems in Relation to Molecular Orientation and Crystallinity

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