Stress and neutron scattering measurements on linear polymer melts undergoing steady elongational flow

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• 作者：Ole Hassager (1) OH@kt.dtu.dk
  Kell Mortensen (2)
  Anders Bach (1)
  Kristoffer Almdal (3)
  Henrik Koblitz Rasmussen (4)
  Wim Pyckhout-Hintzen (5)
• 关键词：Scattering – ; Polymer melt – ; Uniaxial extension – ; Polystyrene
• 刊名：Rheologica Acta
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：51
• 期：5
• 页码：385-394
• 全文大小：444.8 KB
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• 作者单位：1. Department of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark2. Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, 1871 Frederiksberg C, Denmark3. Department of Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark4. Department of Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark5. J眉lich Centre for Neutron Science-1 & Institute for Complex Systems, Forschungszentrum J眉lich, J眉lich, 52425 Germany
• 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

We use small-angle neutron scattering to measure the molecular stretching in polystyrene melts undergoing steady elongational flow at large stretch rates. The radius of gyration of the central segment of a partly deuterated polystyrene molecule is, in the stretching direction, increasing with the steady stretch rate to a power of about 0.25. This value is about half of the exponent observed for the increase in stress value σ, in agreement with Gaussian behavior. Thus, finite chain extensibility does not seem to play an important role in the strongly non-linear extensional stress behavior exhibited by the linear polystyrene melt.