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

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  • Necking Stress of Various Crystalline Polymers
  • 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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説明

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.

収録刊行物

  • 高分子論文集

    高分子論文集 34 (2), 91-96, 1977

    公益社団法人 高分子学会

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