Mechanical Property Enhancement of Semi-Crystalline Polymers by Solid State Rolling

Bigg, D. M.; Smith, Edward G.; Epstein, Michael M.; Fiorentino, R. J.

doi:10.1115/1.3185920

Cited by 5 publications

(1 citation statement)

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“…In order to consider the temperature effect during the stamping process, Cao et al [5] proposed a simple approach, in which the composite material properties are modified based on the contact status between the tool and the fabric: a high-temperature state for the contacting part and a lowtemperature state for the non-contacting part. Bigg et al [6,7] studied the part-forming characteristics of several thermoplastic composites, including glass fiber-reinforced polypropylene, nylon-12, polybutylene, polyethylene, etc. As noted by many researchers, friction must occur between the mold surface and the heated composite as the material moves across the tool surface until it is fully formed.…”

Section: Introductionmentioning

confidence: 99%

Large Shear Deformation of E-glass/ Polypropylene Woven Fabric Composites at Elevated Temperatures

Zhu

Tao

2009

Journal of Reinforced Plastics and Composites

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Stamping operation of textile composite sheets in industry involves a process of heating and cooling of the material. In the present article, the in-plane large shear deformation of woven fabric composite sheets at elevated temperatures is studied. Using the modified ‘picture frame’ test, the effects of temperature on the shear behavior of the material and the onset of wrinkling were investigated. In addition to the reduction in yarn width, the change of physical and mechanical properties of polypropylene (PP) fibers with temperature also plays a significant role. The initial shear stiffness of the composite sheets and the onset of wrinkling are reasonably explained by inter-yarn friction measurement. To simply consider the temperature effect, the introduction of a temperature-dependent factor for the simulation of stamping operation is suggested.

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Section: Introductionmentioning

confidence: 99%

Large Shear Deformation of E-glass/ Polypropylene Woven Fabric Composites at Elevated Temperatures

Zhu

Tao

2009

Journal of Reinforced Plastics and Composites

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Rolling and roll‐drawing of ultrahigh molecular weight polyethylene reactor powders

Wang¹,

Porter²

1991

J of Applied Polymer Sci

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SYNOPSISUltrahigh molecular weight polyethylene (UHMWPE) reactor powders have been found to be processable in the solid state by the techniques of rolling and roll-drawing. Plates of compacted UHMWPE reactor powder were prepared below their melting points. These plates were then rolled at 124°C. The maximum uniaxial draw ratio (DR) obtained by multiple rolling was about 10. In additional experiments, rolled plates of a DR of 6 were further drawn by tensile stretching at a temperature of 135°C. The specimens prepared by rolling and by the two-stage draw were characterized by tensile measurements, differential scanning calorimetry (DSC) , and X-ray diffraction. Results show that, on rolling alone, the tensile modulus and tensile strength achieved were 3 GPa and 42 MPa, respectively, a t a DR of 9.6. The rolled plates were effectively drawn further to a total DR of 86. Such highly drawn films exhibited tensile moduli and tensile strength up to 81 and 1.3 GPa, respectively. A high crystallinity and high crystal orientation were also obtained by the two-stage draw.

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Fabrication of high modulus films by solid state rolling

Bigg

Smith

Epstein

et al. 1986

Polymer Engineering & Sci

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Solid state rolling of semicrystalline polymers represents a high speed process for producing oriented, high modulus films, tapes, and sheets. The important process variables include roll temperature, thickness of initial sheet, roll speed, take-up tension, roll diameter, and initial morphological state of the polymer. Roll temperature controls both the extent of maximum deformation and the rate of rolling. A minimum temperature exists for each polymer below which the orientation process is sharply limited. This condition is similar to the limitation present in the hydrostatic extrusion process, in which the alpha crystallization temperature limits the orientation process. Roll speeds as high as 20 m/min have been realized. It is apparent that film thickness and thickness reduction ratio have a strong effect on the ultimate rolling rate. The process, as currently practiced, is adiabatic, and therefore, heat transfer limited. The take-up tension influences the extent of orientation in the amorphous phase of the polymer. This in turn affects its thermal and chemical stability. The effect of roll diameter is to limit the extent of thickness reduction by causing roll-film slippage when the roll diameter to thickness reduction ratio is below some as yet undetermined value. The initial morphological state of the polymer affects the amount of crystalline deformation possible, the surface texture of the rolled film, and the tear resistance of the oriented film.

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Mechanical Property Enhancement of Semi-Crystalline Polymers by Solid State Rolling

Cited by 5 publications

References 0 publications

Large Shear Deformation of E-glass/ Polypropylene Woven Fabric Composites at Elevated Temperatures

Large Shear Deformation of E-glass/ Polypropylene Woven Fabric Composites at Elevated Temperatures

Rolling and roll‐drawing of ultrahigh molecular weight polyethylene reactor powders

Fabrication of high modulus films by solid state rolling

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