Flow-induced crystallization studied in the RheoDSC device: Quantifying the importance of edge effects

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• 作者：Peter C. Roozemond (1) (2)
  Martin van Drongelen (1)
  Leander Verbelen (3)
  Peter Van Puyvelde (3)
  Gerrit W. M. Peters (1)
  
  1. Department of Mechanical Engineering ; Eindhoven University of Technology ; P.O. Box 513 ; 5600MB ; Eindhoven ; The Netherlands
  2. DSM Ahead ; P.O. Box 18 ; 6160 BB ; Geleen ; Geleen ; The Netherlands
  3. Laboratory of Applied Rheology and Polymer Processing ; Department of Chemical Engineering ; Leuven Material Research Centre ; Katholieke Universiteit Leuven ; W. de Croylaan 46 ; B-3001 ; Leuven ; Belgium
  
• 关键词：Crystlallization ; Shear ; induced structure formation ; Shear flow ; Rotational flow ; Oscillatory shear ; Melt
• 刊名：Rheologica Acta
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：54
• 期：1
• 页码：1-8
• 全文大小：664 KB
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  17. Janssens V (2010) RheoDSC: Development and validation of a combined rheometric and calorimetric measurement technique. Ph.D. thesis, Katholieke Universiteit Leuven
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Polymer Sciences
  Mechanical Engineering
  Soft Matter and Complex Fluids
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1528

文摘

Flow-induced crystallization is investigated through short-term shear flow experiments on poly(1-butene) in the RheoDSC device. We demonstrate that the DSC signal shows contributions from spherulitic morphology in the center of the sample and oriented structures at the edge of the sample, the latter being induced by edge effects at the free surface. It is shown that, although small in terms of volume, the crystallization at the edge has a dominating influence on the measured rheology. We show how these kinds of effects can be recognized in stand-alone rheometric studies of flow-induced crystallization.