Linear and nonlinear viscoelasticity of polymer/silica nanocomposites: an understanding from modulus decomposition

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• 作者：Jun Wang ; Ying Guo ; Wei Yu ; Chixing Zhou ; Paul Steeman
• 关键词：Polymer nanocomposites ; Percolation ; Rheology
• 刊名：Rheologica Acta
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：55
• 期：1
• 页码：37-50
• 全文大小：1,389 KB
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• 作者单位：Jun Wang (1)
  Ying Guo (2)
  Wei Yu (1)
  Chixing Zhou (1)
  Paul Steeman (3)
  
  1. Advanced Rheology Institute, Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China
  2. Performance Materials Research Center, DSM (China) Limited, Shanghai, 201203, People’s Republic of China
  3. Materials Science Center, DSM Research, 6160, MD, Geleen, The Netherlands
  
• 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 investigate the linear and nonlinear viscoelasticity of a model polymer nanocomposite of fumed silica nanoparticles in poly-(ethylene-co-α-butene) (PEB). Above a critical filler fraction, a space-filling network builds up as a result of cluster agglomeration and causes the material to change from liquid-like to solid-like states. Using the Winter-Chambon criterion, the percolation threshold from the measured dynamic moduli is found to depend strongly on the matrix viscoelasticity even when the particle dispersion is identical. Such phenomenon comes from the implicit assumption in the method that the contribution from particles (or particle agglomerates) should dominate the dynamic moduli, which is usually inapplicable when polymer has a high viscosity (or elasticity). A new method is suggested to decompose the moduli of composites into the hydrodynamic part and the part from particle agglomerates by taking into consideration the different effects of particles on the strain rate and stress. The two portions are shown to depend on oscillatory frequency, which are adopted to extrapolate the dynamic moduli to lower frequency. The percolation threshold from these extrapolated data becomes independent of the matrix viscoelasticity. Furthermore, it is found that the appearance of nonlinear behavior in oscillatory shear is related to the portion of particle agglomerates in storage modulus and the strain rate is the key factor to destroy the structures.