Necking Stress of Various Crystalline Polymers

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  • 結晶性高分子のネッキング現象　ＩＩ　　各種結晶性高分子のネッキング応力
  • カク タネケッショウセイ コウブンシ ノ ネッキング オウリョク ケッショウセ

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In the preceding paper the necking stress of crystalline polymer was derived thermodynamically and was expressed as σcn=xΔSm (Tm-T) / (αn-1), where σcn is critical necking stress at extremely low draw rate, x crystallinity, ΔSm entropy of fusion defined as ΔHm/Tm, ΔHm heat of fusion, Tm melting temperature, T drawing temperature and αn neck draw ratio. The necking stress of high density PE was in satisfactory agreement with that calculated by this equation. In this paper the applicability of this equation to various polymers such as PP, POM, PET, PCTFE, PTFE, Nylon 6 and Nylon 66, as well as PE has been examined. σcn and αn were estimated by the experiment on the neck draw, and x was obtained from the density. Then the entropies of fusion ΔSm for various polymers were calculated from the equation. ΔSm obtained by this method agrees approximately with the values obtained by the calorimetry. The conclusion is that the equation of the necking stress was applicable quantitatively to the various crystalline polymers.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 34 (2), 91-96, 1977

    The Society of Polymer Science, Japan

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