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Melt Behaviour of Poly(p-xylylene) (PPX) Coated Gel-spun UHMW-PE Fibers As Revealed by Temperature Modulated DSC

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Abstract

The method of temperature modulated DSC has been applied to obtain additional information about the effect of constraints on the melting behaviour of gel-spun ultra high molecular mass polyethylene (UHMW-PE) fibers coated with a high temperature stable poly(p-xylylene) (PPX) polymer. The underlying signal, corresponding to the normal DSC signal, reveals two endothermic peaks for the coated PE fibers. A shift in the underlying and magnitude signal from 142 to 145°C at 0.1 K min–1 , a relative small magnitude signal, together with a vanishing step-like change in the phase signal with increasing PPX coating layer thickness characterize the constraints in terms of a hindrance of the melting of the unconstrained orthorhombic crystal fraction. The time constant of the melting process can be estimated as larger than the reciprocal angular frequency 1/ω=5 s of the modulation.

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Authors and Affiliations

  1. Eindhoven Polymer Laboratories (EPL), Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, NL-5600 MB, Eindhoven, The Netherlands

    U. Göschel & G. W. H. Höhne

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  1. U. Göschel
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  2. G. W. H. Höhne
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Göschel, U., Höhne, G.W.H. Melt Behaviour of Poly(p-xylylene) (PPX) Coated Gel-spun UHMW-PE Fibers As Revealed by Temperature Modulated DSC. Journal of Thermal Analysis and Calorimetry 59, 699–709 (2000). https://doi.org/10.1023/A:1010137317151

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