Temperature dependence of the crystal lattice modulus and the Young's modulus of polyethylene

Matsuo, Masaru; Sawatari, Chie

doi:10.1021/ma00184a022

Cited by 38 publications

(23 citation statements)

References 10 publications

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“…118 GPa on the basis of the theoretical analysis described elsewhere. 19 This indicates no temperature dependence of crystal lattice modulus of PET along the chain direction, as has been reported for PE 23 PP, 24 and PVA. 10 In contrast, the other crystal moduli decrease with increasing temperature.…”

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confidence: 67%

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Mechanical Properties of Poly(ethylene terephthalate) Estimated in Terms of Orientation Distribution of Crystallites and Amorphous Chain Segments under Simultaneous Biaxially Stretching

Bin

Oishi

Yoshida

et al. 2004

Polym J

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ABSTRACT:Young's modulus of poly(ethylene terephthalate) (PET) film was estimated by using the generalized orientation factors of crystallites and amorphous chain segments calculated from the orientation functions of crystallites and amorphous chain segments. Theoretical analysis was carried out on the basis of a two-phase model assuring the homogeneous stress hypothesis for a polycrystalline material. In this model system, the anisotropic crystal phase is surrounded by the anisotropic amorphous phase. As the theoretical values of elastic compliance of crystal unit of PET, the values by Tashiro were adopted. The experimental values of Young's modulus at room temperature were in good agreement with the predicted value calculated by using the theoretical compliance. Furthermore, the ultimate value of Young's modulus was estimated by assuming an ideal simultaneous biaxially stretching film with 100% crystallinity and the perfect orientation of the c-axis as well as that of benzene rings parallel to the film surface. The predicted ultimate goal of the Young's modulus was less than 5 GPa indicating the difficulty in producing high modulus and high strength PET sheets in terms of theoretical aspects.

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confidence: 67%

“…This procedure was represented elsewhere in detail. 15,16,23 For simultaneous biaxially stretched films, this model corresponds to a series model at ¼ 1, while it corresponds to a parallel model at ¼ 1. In following discussion, some final equations are described to shorten this paper.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Poly(ethylene terephthalate) Estimated in Terms of Orientation Distribution of Crystallites and Amorphous Chain Segments under Simultaneous Biaxially Stretching

Bin

Oishi

Yoshida

et al. 2004

Polym J

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“…8). In this connection it is worth recalling the thorough examination of elastic properties of ultra drawn polyethylene films reported by Matsuo and Sawatari [122,123]. Investigation of X-ray diffraction from the stretched films showed that elastic moduli of polyethylene crystals are practically independent of temperature up to 145°C while Young's modulus of the films decreased with temperature.…”

Section: Temperature Dependence Of Young's Modulusmentioning

confidence: 84%

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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The review focuses on the current studies of the deformation response and accompanying structural transformations of thermoplastic semicrystalline polymers subjected to uniaxial tension prior to the yield point. The mechanisms of strain-induced cavitation of amorphous layers and damages of crystalline lamellae are analyzed in line with novel results on the deformation behavior of solid polymers at temperatures exceeding the glass transition point. The coupling of viscoelastic and plastic deformation mechanisms with the small-strain structural transformations is critically discussed on the basis of the advanced theoretical modeling of mechanical properties of semicrystalline polymers.

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“…But this may not happen in fact. A very recent study indicates that the crystal modulus of polyethylene is independent of temperature (32). However, the modulus of imperfect polyethylene fibers ( K = 21 1 to 222 GPA a t 20°C) decreases with increasing temperature apparently a s a result of decreasing crystallinity as T increases (32).…”

Section: Discussionmentioning

confidence: 98%

The breaking strength of perfect polymer fibers

Smith¹

1990

Polymer Engineering & Sci

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The breaking strength, strain at break, and work to rupture of perfect fibers prepared with polymers of finite molecular weight are calculated by treating the perfect fiber as a stressed crystal undergoing a crystal‐melt phase transition. In this view, a tensile load destabilizes the crystal and depresses its melting point. When the load is sufficient to lower the melting temperature to the ambient condition the fiber melts—i.e., fails. The theoretical equations (extremely simple) are applied to several common polymer fibers. The maximum tensile strength of polyethylene, for example, is calculated to be 7 to 9 GPa, in good agreement with current experimental results.

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Temperature dependence of the crystal lattice modulus and the Young's modulus of polyethylene

Cited by 38 publications

References 10 publications

Mechanical Properties of Poly(ethylene terephthalate) Estimated in Terms of Orientation Distribution of Crystallites and Amorphous Chain Segments under Simultaneous Biaxially Stretching

Mechanical Properties of Poly(ethylene terephthalate) Estimated in Terms of Orientation Distribution of Crystallites and Amorphous Chain Segments under Simultaneous Biaxially Stretching

Structural mechanics of semicrystalline polymers prior to the yield point: a review

The breaking strength of perfect polymer fibers

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