Reversible and irreversible crystallization in high-density polyethylene at low temperature |
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Authors: | Androsch R. |
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Affiliation: | (1) Institute of Materials Science Department of Chemistry Geusaer Str., Martin-Luther-University Halle-Wittenberg, 06217 Merseburg, Germany E-mail |
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Abstract: | Reversible and irreversible crystallization and melting of high-density polyethylene at low temperature has been re-evaluated and is discussed in terms of the concept of the specific reversibility of a crystal. The concept of the specific reversibility links reversible and irreversible melting of a specific crystal such that reversible melting occurs only at slightly lower temperature than irreversible melting. In this study evidence for irreversible crystallization at low temperature in high-density polyethylene is provided, non-avoidable by primary crystallization and extended annealing at high temperature. The simultaneously observed reversible crystallization and melting at low temperature can be attributed to lateral-crystal-surface activity in addition to the well-established reversible fold-surface melting, dominant at high temperature, and evidenced by small-angle X-ray data available in the literature. This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | DSC polyethylene reversible and irreversible crystallization and melting specific reversibility of crystals temperature-modulated DSC |
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