Mechanically Viscoelastic Properties of Cellulose Nanocrystals Skeleton Reinforced Hierarchical Composite Hydrogels

2016 ◽  
Vol 8 (38) ◽  
pp. 25621-25630 ◽  
Author(s):  
Jun Yang ◽  
ChunRui Han
Keyword(s):  
Cellulose Nanocrystals ◽  
Viscoelastic Properties ◽  
Composite Hydrogels

Synergistic Reinforcement of Composite Hydrogels with Nanofiber Mixtures of Cellulose Nanocrystals and Chitin Nanofibers

2020 ◽  
Author(s):  
Cameron W. Irvin ◽  
Chinmay C. Satam ◽  
Jianshan Liao ◽  
Paul S. Russo ◽  
Victor Breedveld ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Composite Hydrogels ◽  
Chitin Nanofibers

Preparation and Viscoelastic Properties of Waterborne Polyurethane/Cellulose Nanocrystals Composites

2013 ◽  
Vol 771 ◽  
pp. 105-108 ◽  
Author(s):  
Qun Zhao ◽  
Ke Lu Yan
Keyword(s):  
Cellulose Nanocrystals ◽  
Viscoelastic Properties ◽  
Loss Modulus ◽  
Casting Process ◽  
Waterborne Polyurethane ◽  
Mechanical Analysis ◽  
Nanocomposite Films ◽  
Ultrasonic Dispersion ◽  
Mechanical Reinforcement ◽  
Power Law Equation

The objective of this work is to study the viscoelastic properties by which nanofillers produce mechanical reinforcement in polymers using dynamic mechanical analysis (DMA). To this purpose, waterborne polyurethane (WBPU) and cellulose nanocrystals (CNCs) composites films with various filler contents were prepared by ultrasonic dispersion followed by emulsion casting process. In frequency sweep tests, the storage modulus and loss modulus were recorded and modeled by the Power Law equation. CNCs precipitation significantly increased the steady state viscous properties of cellulose nanocoposite films but decreased the dynamic viscoelastic properties and frequency sensitivity of nanocomposite films.

scholarly journals Controlled Polyelectrolyte Association of Chitosan and Carboxylated Nano-Fibrillated Cellulose by Desalting

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2023
Author(s):  
Sarah Amine ◽  
Alexandra Montembault ◽  
Matthieu Fumagalli ◽  
Anayancy Osorio-Madrazo ◽  
Laurent David
Keyword(s):  
Mechanical Properties ◽  
Viscoelastic Properties ◽  
Electrostatic Interactions ◽  
Mechanical Performance ◽  
Cellulose Nanofibrils ◽  
Acetate Solution ◽  
Large Excess ◽  
Composite Hydrogels ◽  
Polyelectrolyte Complexation ◽  
Aqueous Mixture

We prepared chitosan (CHI) hydrogels reinforced with highly charged cellulose nanofibrils (CNF) by the desalting method. To this end, the screening of electrostatic interactions between CHI polycation and CNF polyanion was performed by adding NaCl at 0.4 mol/L to the chitosan acetate solution and to the cellulose nanofibrils suspension. The polyelectrolyte complexation between CHI polycation and CNF polyanion was then triggered by desalting the CHI/CNF aqueous mixture by multistep dialysis, in large excess of chitosan. Further gelation of non-complexed CHI was performed by alkaline neutralization of the polymer, yielding high reinforcement effects as probed by the viscoelastic properties of the final hydrogel. The results showed that polyelectrolyte association by desalting can be achieved with a polyanionic nanoparticle partner. Beyond obtaining hydrogel with improved mechanical performance, these composite hydrogels may serve as precursor for dried solid forms with high mechanical properties.

Viscoelastic properties of a bent and straight dimeric liquid crystal

1993 ◽  
Vol 3 (5) ◽  
pp. 597-602 ◽  
Author(s):  
Gregory A. DiLisi ◽  
E. M. Terentjev ◽  
Anselm C. Griffin ◽  
Charles Rosenblatt
Keyword(s):  
Liquid Crystal ◽  
Viscoelastic Properties
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