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 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.

scholarly journals Characteristics of Thermosetting Polymer Nanocomposites: Siloxane-Imide-Containing Benzoxazine with Silsesquioxane Epoxy Resins

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2510
Author(s):  
Chih-Hao Lin ◽  
Wen-Bin Chen ◽  
Wha-Tzong Whang ◽  
Chun-Hua Chen
Keyword(s):  
Thermal Expansion ◽  
Storage Modulus ◽  
Polymer Nanocomposites ◽  
Epoxy Resins ◽  
Coefficient Of Thermal Expansion ◽  
Dynamic Mechanical ◽  
Double Decker ◽  
The Matrix ◽  
Thermosetting Polymer ◽  
Oligomeric Silsesquioxane

A series of innovative thermosetting polymer nanocomposites comprising of polysiloxane-imide-containing benzoxazine (PSiBZ) as the matrix and double-decker silsesquioxane (DDSQ) epoxy or polyhedral oligomeric silsesquioxane (POSS) epoxy were prepared for improving thermosetting performance. Thermomechanical and dynamic mechanical characterizations indicated that both DDSQ and POSS could effectively lower the coefficient of thermal expansion by up to approximately 34% and considerably increase the storage modulus (up to 183%). Therefore, DDSQ and POSS are promising materials for low-stress encapsulation for electronic packaging applications.

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