The Influence of Chain Entanglement Density on the Increases in Strength and Modulus with Ultra-drawing of Ultra-high-molecular-weight Polypropylene.

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  • The Influence of Chain Entanglement Density on the Increase in Strength and Modulus with Ultra-drawing of Ultra-high-molecular-weight Polypropylene
  • Influence of Chain Entanglement Density on the Increase in Strength and Modulus with Ultra drawing of Ultra high molecular weight Polypropylene

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The influence of chain entanglement density on the ultra-drawing of ultra-high-molecular-weight polypropylene (UHMW-PP) has been studied by comparison of the gel-like spherulite pressing method (the GSP method) and the gel-casting method, using two kinds of specimens prepared from 2.0wt% solution of UHMW-PP. The only major difference between the specimens in both methods is the cooling rate of solution. The influence of chain entanglement density in an undrawn specimen on the increase in strength and modulus with ultra-drawing has been discussed. It was found that the slopes of strength and modulus versus draw ratio (DR) were steeper in the gel-casting method. This difference was concluded to be due to the difference of chain entanglement density of undrawn specimens, by considering the fine structure and the maximum draw ratio (λmax). And, it was considered that the differences in the above slopes between both methods could not be explained by the changes of crystalline orientation and crystalline size but by the change of fraction of folded-chain crystals (or extended-chain crystals) with ultra-drawing.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 58 (12), 444-450, 2002

    The Society of Fiber Science and Technology, Japan

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