Roll-drawing and die-drawing of toughened poly(ethylene terephthalate). Part 1. Structure and mechanical characterization

Chapleau, N.; Mohanraj, J.; Ajji, A.; Ward, I. M.

doi:10.1016/j.polymer.2004.10.089

Cited by 18 publications

(6 citation statements)

References 34 publications

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“…Most of the delivered energy was consumed during specimen bending rather than fracture. In contrast to the tensile properties, there was an optimum λ around 5, for which the impact strength was the highest [similar observations were noted for PP and poly(ethylene terephthalate)14–17 and in a review by Galeski18]. Dynamic mechanical measurements showed that rolling to a high strains (>6) produced not only a well‐developed orientation of the crystalline component but also a high orientation and transverse ordering of the amorphous phase, which led to the anisotropy of the material properties in the loading direction/constraint direction plane, perpendicular to the rolling direction.…”

Section: Introductionmentioning

confidence: 55%

Very high modulus high‐density polyethylene and high‐modulus polypropylene obtained by solid‐state roll drawing

Ajji

Dumoulin

2006

J of Applied Polymer Sci

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This article describes results obtained with a process developed for rolling and drawing simultaneously polymer profiles in the solid state. Solid-state roll drawing has the advantage of being continuous, which allows relatively high production rates and the generation of high deformation ratios with some degree of biaxial orientation. The roll-drawing process allows the extent of biaxial orientation to be controlled by the adjustment of the tension and compression loads applied to the polymers, in particular semicrystalline thermoplastics. Some experimental results obtained with a four-station roll-drawing apparatus are presented, particularly on high-density polyethylene (HDPE) and polypropylene. The effect of process parameters, such as the gap between the rolls and tension, are discussed.Aspects discussed also include relaxation; structure development in terms of orientation and crystallinity as a function of draw ratio (); as a function of process parameters; and finally, mechanical and thermal properties as a function of . Moduli as high as 25 GPa in the longitudinal direction and about 4 GPa in the transverse direction were obtained with successively rolled, initially thick, HDPE profiles.

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Section: Introductionmentioning

confidence: 55%

Very high modulus high‐density polyethylene and high‐modulus polypropylene obtained by solid‐state roll drawing

Ajji

Dumoulin

2006

J of Applied Polymer Sci

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“…Moreover, it is discovered that these characteristics increase with increasing pre-strain. Furthermore, deformation-induced anisotropy by rolling (Chapleau et al, 2005;Wang et al, 2016;Phua et al, 2011) and extrusion (Tim et al, 2009) have been investigated, where the same results as those obtained from studies regarding anisotropy caused by a uniaxial tensile force were presented. The deformation behavior of deformation-induced anisotropic thermoplastics was visually observed (Shinozaki and Groves, 1973;Brown et al, 1968).…”

Section: Introductionmentioning

confidence: 91%

Evaluation of deformation-induced anisotropy for plastically deformed polycarbonate

Higuchi

Sakaue

2021

Mechanical Engineering Journal

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In the present study, the deformation-induced anisotropic mechanical characteristics and the strain distribution are evaluated from the specimens cut from the necking part of polycarbonate. First, large specimens are used to create deformation-induced anisotropy in the necking part via a uniaxial tensile test. Next, the small specimens are cut from the necking parts in an arbitrary direction with respect to the tensile direction of the large specimens. The anisotropic mechanical characteristics in the small specimens are evaluated by a uniaxial tensile test and the strain distribution is measured by the digital image correlation. The result shows that the stress-strain curve of the small specimen depends on the cutting angle to the tensile direction of the large specimens. The elastic modulus and the maximum stress of the small specimens are maximum in the tensile direction of the large specimen, and the elastic modulus and the maximum stress decreases with increasing the cutting angle. Therefore, the deformation-induced anisotropic mechanical characteristics in the necking part are observed. In addition, if the uniaxial tensile direction to the small specimen differs from that to the large specimen, a shear strain band appears in the small specimen and the longitudinal direction of the shear strain band is affected to the tensile direction of the large specimen. The test results indicate that the anisotropic elastic modulus and the anisotropic characteristics in the plastic region are expressed by the anisotropic elastic constitutive equation and the Tsai-Hill criterion, respectively. Moreover, the anisotropic strain hardening is revealed because the Tsai-Hill parameters depends on the plastic strain.

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“…Sun et al [2] and Li et al [3] reported different chain structures of material resulted in the distinct final structure and properties of products even prepared by the same processing method. Chapleau et al [4,5] also reported that the same material via different processing methods had distinct properties. Previous studies has reported that the final structure and morphology not only depend on the inherent characteristic of materials including its chemical composition, molecular weight and distribution, component ratio, and so on [6][7][8][9] but also crucially depend on the structure imparted during various processing conditions [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Processing Parameters on the Crystalline, Orientation, and Mechanical Properties of Two‐Stage Die‐Drawn Polypropylene

Yang

Luo

et al. 2019

Polymer Engineering & Sci

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An investigation specifically focusing on the relationship among processing parameters, structure, and mechanical properties of solid two‐stage die‐drawn polypropylene (PP) has been done in this study, which aimed at providing a reliable reference in the choose of appropriate conditions that can be able to meet a specific processing requirement. PP sheets were drawn through a self‐design solid two‐stage die‐drawing apparatus to various drawing ratios (DRs) at different speeds and with different die‐exit thicknesses. The results showed that tensile strength, modulus, and the degree of orientation significantly increased with the nominal DR and could be further improved by increasing the drawing speed. While the crystallinity increased prior and decreased to near a constant value when the drawing speed was over 150 mm/min in the researched scope. Larger the die‐exit thickness was, lower the orientation degree was but higher the crystallinity could be obtained. Compared with crystallinity, orientation degree plays a leading role in the final product properties during a two‐stage solid die‐drawing process. POLYM. ENG. SCI., 59:2347–2355, 2019. © 2019 Society of Plastics Engineers

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Roll-drawing and die-drawing of toughened poly(ethylene terephthalate). Part 1. Structure and mechanical characterization

Cited by 18 publications

References 34 publications

Very high modulus high‐density polyethylene and high‐modulus polypropylene obtained by solid‐state roll drawing

Very high modulus high‐density polyethylene and high‐modulus polypropylene obtained by solid‐state roll drawing

Evaluation of deformation-induced anisotropy for plastically deformed polycarbonate

The Effect of Processing Parameters on the Crystalline, Orientation, and Mechanical Properties of Two‐Stage Die‐Drawn Polypropylene

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