Rheology of fibrillated cellulose suspensions after surface modification by organic nanoparticle deposits

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• 作者：Pieter Samyn ; Hesam Taheri
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：51
• 期：21
• 页码：9830-9848
• 全文大小：3,835 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：51

文摘

The role of surface modification on rheological properties of fibrillated cellulose suspensions has been evaluated under creep, oscillatory, and rotational testing conditions. Two types of fibrillated cellulose were produced by mechanical homogenization, followed by the deposition of poly(styrene-co-maleimide) or SMI nanoparticles containing encapsulated palm oil on the fibril surfaces. During static creep testing, the modified fibrils changed into fully viscous properties, while native fibrils showed viscoelastic behavior at low stresses. A lower viscosity and reduction in hysteresis effects were experienced during steady-state rotational flow testing, together with a reduction in yield stress after modification. A study of viscoelastic properties by oscillatory testing illustrated that the cross-over point between storage and loss moduli was shifted towards lower strains by surface modification as an indication for the enhancement of liquid-like properties observed for SMI/oil nanoparticle dispersions, while the transition point was hardly affected by fibrillation. The variations in rheological properties were overruled by surface modification and reduction in hydrogen bonding interactions of modified fibrillated cellulose, whereas rheological properties of a physical mixture of native fibrillated cellulose suspension and nanoparticle dispersion remained dominated by the fibrillated cellulose.Electronic supplementary materialThe online version of this article (doi:10.1007/s10853-016-0216-x) contains supplementary material, which is available to authorized users.