Multiple melting peak analysis with gel-spun ultra-high molar mass polyethylene

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The multiple melting peaks observed on differential scanning calorimetry (DSC) of ultrahigh molar-mass PE fibers are analyzed as a function of sample mass. Using modern DSC capable of recognizing single fibers of microgram size, it is shown that the multiple peaks are in part or completely due to sample packing. Loosely packed fibers fill the entire volume of the pan with rather large thermal resistance to heat flow. On melting, the fibers contract and flow to collect ultimately at the bottom of the pan. This process seems to be able to cause an artifact of multistage melting dependent on the ... continued below

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16 p.

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Boller, A. & Wunderlich, B. December 31, 1996.

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Description

The multiple melting peaks observed on differential scanning calorimetry (DSC) of ultrahigh molar-mass PE fibers are analyzed as a function of sample mass. Using modern DSC capable of recognizing single fibers of microgram size, it is shown that the multiple peaks are in part or completely due to sample packing. Loosely packed fibers fill the entire volume of the pan with rather large thermal resistance to heat flow. On melting, the fibers contract and flow to collect ultimately at the bottom of the pan. This process seems to be able to cause an artifact of multistage melting dependent on the properties of the fibers. A method is proposed to greatly reduce, or even eliminate, errors of this type. The crucial elements of the analysis of melting behavior and melting temperature are decreasing the sample size and packing the individual fibers in a proper geometry, or to introduce inert media to enhance heat transport.

Physical Description

16 p.

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OSTI as DE97001293

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  • 11. international congress on thermal analysis and calorimetry, Philadelphia, PA (United States), 12-16 Aug 1996

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  • Other: DE97001293
  • Report No.: CONF-960826--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 436421
  • Archival Resource Key: ark:/67531/metadc679099

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 23, 2016, 3:39 p.m.

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Boller, A. & Wunderlich, B. Multiple melting peak analysis with gel-spun ultra-high molar mass polyethylene, article, December 31, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc679099/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.