Rheological behavior of nanofibrillated cellulose/acrylic polymer nanocomposites: Effect of melt extrusion

2011 ◽  
Vol 32 (12) ◽  
pp. 2070-2075 ◽  
Author(s):  
Iskander Besbes ◽  
Albert Magnin ◽  
Sami Boufi
Keyword(s):  
Polymer Nanocomposites ◽  
Rheological Behavior ◽  
Nanofibrillated Cellulose ◽  
Melt Extrusion ◽  
Acrylic Polymer

scholarly journals Injectable and Gellable Chitosan Formulations Filled with Cellulose Nanofibers for Intervertebral Disc Tissue Engineering

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1202 ◽  
Author(s):  
Ingo Doench ◽  
Maria Torres-Ramos ◽  
Alexandra Montembault ◽  
Paula Nunes de Oliveira ◽  
Celia Halimi ◽  
...  
Keyword(s):  
Intervertebral Disc ◽  
Rheological Behavior ◽  
Biomedical Application ◽  
Flow Behavior ◽  
Cellulose Nanofibers ◽  
Nanofibrillated Cellulose ◽  
The Body ◽  
Mechanical Reinforcement ◽  
Invasive Approach

The development of non-cellularized injectable suspensions of viscous chitosan (CHI) solutions (1.7–3.3% (w/w)), filled with cellulose nanofibers (CNF) (0.02–0.6% (w/w)) of the type nanofibrillated cellulose, was proposed for viscosupplementation of the intervertebral disc nucleus pulposus tissue. The achievement of CNF/CHI formulations which can gel in situ at the disc injection site constitutes a minimally-invasive approach to restore damaged/degenerated discs. We studied physico-chemical aspects of the sol and gel states of the CNF/CHI formulations, including the rheological behavior in relation to injectability (sol state) and fiber mechanical reinforcement (gel state). CNF-CHI interactions could be evidenced by a double flow behavior due to the relaxation of the CHI polymer chains and those interacting with the CNFs. At high shear rates resembling the injection conditions with needles commonly used in surgical treatments, both the reference CHI viscous solutions and those filled with CNFs exhibited similar rheological behavior. The neutralization of the flowing and weakly acidic CNF/CHI suspensions yielded composite hydrogels in which the nanofibers reinforced the CHI matrix. We performed evaluations in relation to the biomedical application, such as the effect of the intradiscal injection of the CNF/CHI formulation in pig and rabbit spine models on disc biomechanics. We showed that the injectable formulations became hydrogels in situ after intradiscal gelation, due to CHI neutralization occurring in contact with the body fluids. No leakage of the injectate through the injection canal was observed and the gelled formulation restored the disc height and loss of mechanical properties, which is commonly related to disc degeneration.

Efficient Fabrication of Polymer Nanocomposites with Effective Exfoliation and Dispersion by Solid-State / Melt Extrusion

2012 ◽  
Vol 32 (1) ◽  
Author(s):  
Alyssa M. Whittington ◽  
Stephen M. Brouse ◽  
Michael A. Malusis ◽  
Katsuyuki Wakabayashi
Keyword(s):  
Solid State ◽  
Polymer Nanocomposites ◽  
Melt Extrusion

Modelling of the chemo-rheological behavior of thermosetting polymer nanocomposites

2009 ◽  
Vol 30 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Govanni Lelli ◽  
Andrea Terenzi ◽  
Jose M. Kenny ◽  
Luigi Torre
Keyword(s):  
Polymer Nanocomposites ◽  
Rheological Behavior ◽  
Thermosetting Polymer

scholarly journals Correlations between rheological behavior and intrinsic properties of nanofibrillated cellulose from wood and soybean hulls with varying lignin content

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 4831-4845
Author(s):  
Maria C. Iglesias ◽  
Fatima Hamade ◽  
Burak Aksoy ◽  
Zhihua Jiang ◽  
Virginia A. Davis ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Charge Density ◽  
Rheological Behavior ◽  
Colloidal Stability ◽  
Nanofibrillated Cellulose ◽  
Raw Material ◽  
Chemical Compositions ◽  
Intrinsic Properties ◽  
Soybean Hulls ◽  
Aqueous Suspensions

Effects of raw material and chemical composition were considered relative to the intrinsic properties and the rheological behavior of nanofibrillated cellulose aqueous suspensions (CNFs). Atomic force microscopy, Fourier-transform infrared spectroscopy, surface chemistry analysis, thermal gravimetrical analysis, and zeta-potential were used to study the morphology, chemical composition, charge density, as well as thermal and colloidal stability of the different CNFs. Regarding the rheological properties of the samples, steady-state and oscillation studies of the CNF aqueous suspensions obtained from wood and soybean hulls were performed. An interesting correlation was found between the rheological behavior of CNF suspensions and their intrinsic properties. Soybean CNF presented lower viscosities than wood samples, which could be related to their morphology and charge density. Additionally, unbleached soybean CNF (sb-LCNF) showed yield stress compared with the other samples, which could be attributed to the presence of pectin. Furthermore, the different chemical compositions between the samples affected their thermal properties, as well as on their crystallinity.

scholarly journals Dynamics and Rheology of Linear Entangled Polymer Nanocomposites

2009 ◽  
Author(s):  
Kalonji K. Kabanemi ◽  
Jean-Franc¸ois He´tu
Keyword(s):  
Mechanical Properties ◽  
Polymer Nanocomposites ◽  
Rheological Behavior ◽  
Thermal And Mechanical Properties ◽  
Scientific Interest ◽  
Recent Past ◽  
Manufacturing Procedure ◽  
Entangled Polymer

Polymers filled with nanoparticles have attracted considerable technological and scientific interest during the recent past, because of dramatic enhancements in physical, thermal, and mechanical properties observed experimentally. It is necessary to understand the rheological behavior of such mixtures so as to improve their manufacturing procedure.

Rheological Behavior of Polystyrene-Based Nanocomposite Suspensions under LAOS

2016 ◽  
Vol 851 ◽  
pp. 215-220
Author(s):  
Petr Lepcio ◽  
Frantisek Ondreas ◽  
Josef Jancar
Keyword(s):  
Polymer Nanocomposites ◽  
Rheological Behavior ◽  
Self Assembly ◽  
Thermomechanical Properties ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Nanoscale Structures ◽  
Initial Stage ◽  
Large Amplitude Oscillation ◽  
Fundamental Research ◽  
Induced Changes

Polymer nanocomposites based on polyhedral oligomeric silsesquioxanes (POSS) and their solutions and suspensions are promising systems for fundamental research which could potentially utilize self-assembly approach in designing new nanocomposite materials. Numerous applications could benefit from understanding of these systems, for instance polymer solution based paints and varnishes. This work is an initial stage of a study which aim is to link macroscale thermomechanical properties with nanoscale structures found in polymer nanocomposites. To do so, a suitable experimental protocol for preparing differently organized NPs in polymer matrix has to be find first in which both kinetic and thermodynamical parameters should be taken into account, i.e. solution casting has being investigated. The results presented here found differences between nanoparticle induced changes on rheological behavior of polystyrene solution under large amplitude oscillation shear (LAOS). High-affinity OP-POSS NPs seem to interact with PS at low loadings and form stiffened aggregates, whereas low-affinity OM-POSS NPs remained rather uninvolved. Effect of hydrodynamic forces independent of the NPs chemical nature was also observed.

scholarly journals Rheological Behavior of Polymer Nanocomposites Filled with Spherical Nanoparticles: Insights from Molecular Dynamics Simulation

2021 ◽  
Author(s):  
Haoxiang Li ◽  
Haoyu WU ◽  
Wenfeng Zhang ◽  
Xiuying Zhao ◽  
Yangyang Gao ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Polymer Nanocomposites ◽  
Shear Viscosity ◽  
Rheological Behavior ◽  
Molecular Level ◽  
Dynamics Simulation ◽  
Mean Square ◽  
Shear Rates ◽  
The Mean

<div><div>It is very urgent to understand the rheological behavior of polymer nanocomposites (PNCs) on the molecular level, which is very important for their processing and application. Thus, here the reverse nonequilibrium molecular dynamics simulation isemployed to explore it by tuning the nanoparticle (NP) concentration, the polymer-NPinteraction and the NP size. The shear viscosity (η~-m) exhibits a power law with theshear rate where m varies from 0.42 to 0.53 at high shear rates. By adopting the Carreau-Yasuda model, the obtained zero-shear viscosity gradually rises with increasing the NPconcentration, polymer-NP interaction or reducing the NP size. This is attributed to thestrong adsorption of chains by NPs and the formed network, which leads to the retarded dynamics. In addition, both the first and second normal stress differences also show power laws on the shear rates. The chains are gradually extended as the increase of shear rates, which is characterized by the mean-square end-to-end distance and the mean square radius of gyration. Especially, the evolution process of the NP network and the polymer- NP network is analyzed to deeply understand the shear thinning behavior. The number ofthe direct contact structure of NPs increases while the number of polymer-NP bridgedstructure is reduced. This is further proved by the increase of the formation probability of the NP network and the decrease of the polymer-NP interaction energy. Finally, the chain dynamics is found to be enhanced due to the shear flow. In summary, this work provides a further understanding on the mechanism of the shear thinning of PNCs on the molecular level. <br></div></div>

scholarly journals Synthesis and study on rheological behavior of polystyrene/graphene oxide nanocomposites

2013 ◽  
Vol 16 (4) ◽  
pp. 54-65
Author(s):  
Tam Thanh Mai ◽  
Linh Pham Duy Le ◽  
Nhan Thuc Chi Ha ◽  
Huy Thuc Ha
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Rheological Properties ◽  
Polymer Nanocomposites ◽  
Rheological Behavior ◽  
Graphite Oxide ◽  
Polymer Materials ◽  
Thermal And Mechanical Properties ◽  
New Research

Polymer nanocomposites reinforced by graphene oxide is one of the new research and developed from 2005 up to date. In this study, we had successfully fabricated polystyrene/graphene oxide nanocomposite by solution-based method. Graphite oxide was synthesized by the method of Hummers and exfoliated in solvent under the effect of ultrasound. The thermal and mechanical properties of PS/RGO nanocomposites were superitor to original polystyrene. In addition, our research has focused on the effect of graphene oxide to the rheological properties of polystyrene – one of the most important properties of polymer materials.

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