Isothermal and non-isothermal crystallization kinetics of polyamide 12 used in laser sintering

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• 作者：Fabian Neugebauer ; Vasily Ploshikhin…
• 关键词：Crystallization kinetics ; Polyamide 12 ; Laser sintering ; DSC
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：124
• 期：2
• 页码：925-933
• 全文大小：785 KB
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• 作者单位：Fabian Neugebauer (1)
  Vasily Ploshikhin (1)
  Janick Ambrosy (2)
  Gerd Witt (2)
  
  1. Airbus Endowed Chair for Integrative Simulation and Engineering of Materials and Processes, University of Bremen, Bremen, Germany
  2. Institute of Product Engineering, Manufacturing Technology, University of Duisburg-Essen, Duisburg, Germany
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

Laser sintering of polymers is a steadily improving additive manufacturing method. Mainly used materials are semicrystalline thermoplastics, and as part of those, polyamide 12 has established most. When semicrystalline polymers cool down from the melt, they exhibit volume shrinkage due to crystallization. This crystallization occurs non-uniformly within the produced parts and thus is responsible for part warpage. Aim of this study was to investigate the crystallization kinetics of an, in laser sintering widely used, polyamide 12-based polymer available by supplier EOS with appellation PA2200. For that purpose, several isothermal and non-isothermal DSC measurements were taken. The isothermal measurements were analyzed according to the theory of Avrami. Furthermore, the parameters of the crystallization model by Nakamura were calibrated, and both conditions were simulated. It was found that the isothermal data are very well describable by the theory of Avrami as well as the model by Nakamura can be used to model both conditions.