scholarly journals Tuning the Mechanical Properties of Polymer Nanocomposites Filled with Grafted Nanoparticles by Varying the Grafted Chain Length and Flexibility

Polymers ◽  
2016 ◽  
Vol 8 (9) ◽  
pp. 270 ◽  
Author(s):  
Zixuan Wang ◽  
Zijian Zheng ◽  
Jun Liu ◽  
Youping Wu ◽  
Liqun Zhang
Keyword(s):  
Mechanical Properties ◽  
Polymer Nanocomposites ◽  
Chain Length ◽  
Grafted Nanoparticles

Polyurea With Hybrid Polymer Grafted Nanoparticles: A Parametric Study

2012 ◽  
Author(s):  
Kristin Holzworth ◽  
Gregory Williams ◽  
Bedri Arman ◽  
Zhibin Guan ◽  
Gaurav Arya ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Computational Modeling ◽  
Chain Length ◽  
Polymer Chain ◽  
Parametric Study ◽  
Nano Particles ◽  
Core Material ◽  
Experimental Characterization ◽  
Hybrid Polymer ◽  
Grafted Nanoparticles

The basis of this research is to mitigate shock through material design. In this work, we seek to develop an understanding of parametric variations in polyurea-based nano-composite materials through experimental characterization and computational modeling. Blast-mitigating applications often utilize polyurea due to its excellent thermo-mechanical properties. Polyurea is a microphase-separated segmented block copolymer formed by the rapid reaction of an isocyanate component and an amine component. Block copolymers exhibit unique properties as a result of their phase-separated morphology, which restricts dissimilar block components to microscopic length scales. The soft segments form a continuous matrix reinforced by the hard segments that are randomly dispersed as microdomains. The physical properties of the separate phases influence the overall properties of the polyurea. While polyurea offers a useful starting point, control over crystallite size and morphology is limited. For compositing, the blending approach allows superb control of particle size, shape, and density; however, the hard/soft interface is typically weak for simple blends. Here, we overcome this issue by developing hybrid polymer grafted nanoparticles, which have adjustable exposed functionality to control both their spatial distribution and interface. These nano-particles have tethered polymer chains that can interact with their surrounding environment and provide a method to control well defined and enhanced nano-composites. This approach allows us to adjust a number of variables related to the hybrid polymer grafted nanoparticles including: core size and shape, core material, polymer chain length, polymer chain density, and monomer type. In this work, we embark on a parametric study focusing on the effect of silica nanoparticle size, polymer chain length, and polymer chain density. Preliminary results from experimental characterization and computational modeling indicate that the dynamic mechanical properties of the material can be significantly altered through such parametric modifications. These efforts are part of an ongoing initiative to develop elastomeric composites with optimally designed compositions and characteristics to manage blast-induced stress-wave energy.

Molecular dynamics simulations of the structural, mechanical and visco-elastic properties of polymer nanocomposites filled with grafted nanoparticles

2015 ◽  
Vol 17 (11) ◽  
pp. 7196-7207 ◽  
Author(s):  
Jianxiang Shen ◽  
Jun Liu ◽  
Haidong Li ◽  
Yangyang Gao ◽  
Xiaolin Li ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Polymer Nanocomposites ◽  
Chain Length ◽  
Elastic Properties ◽  
Coarse Grained ◽  
Grafting Density ◽  
Grafted Nanoparticles ◽  
Dynamics Simulations ◽  
Coarse Grained Molecular Dynamics

In this work we have adopted coarse-grained molecular dynamics simulations to systematically investigate the effects of the grafting density and the grafted chain length on the structural, mechanical and visco-elastic properties of polymer nanocomposites (PNCs).

Modulating interfacial attraction of polymer-grafted nanoparticles in melts under shear

Soft Matter ◽  
2014 ◽  
Vol 10 (25) ◽  
pp. 4464-4470 ◽  
Author(s):  
Erkan Senses ◽  
Yang Jiao ◽  
Pinar Akcora
Keyword(s):  
Mechanical Properties ◽  
Shear Flow ◽  
Polymer Nanocomposites ◽  
Flow Fields ◽  
Spatial Ordering ◽  
Grafted Nanoparticles

The mechanical properties of polymer nanocomposites are significantly affected by spatial ordering of nanoparticles (NPs) which can be modified under shear flow fields.

Tuning cavitation and crazing in polymer nanocomposite glasses containing bimodal grafted nanoparticles at the nanoparticle/polymer interface

2019 ◽  
Vol 21 (13) ◽  
pp. 7115-7126 ◽  
Author(s):  
Rui Shi ◽  
Hu-Jun Qian ◽  
Zhong-Yuan Lu
Keyword(s):  
Mechanical Properties ◽  
Polymer Nanocomposites ◽  
Polymer Nanocomposite ◽  
Polymer Interface ◽  
Grafted Nanoparticles ◽  
Graft Chain

The mechanical properties of polymer nanocomposites containing bimodal grafted nanoparticles can be tuned at the nanoparticle/polymer interface using different graft chain types.

scholarly journals Recent Advances in the Synthesis of Polymer-Grafted Low-K and High-K Nanoparticles for Dielectric and Electronic Applications

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2942
Author(s):  
Bhausaheb V. Tawade ◽  
Ikeoluwa E. Apata ◽  
Nihar Pradhan ◽  
Alamgir Karim ◽  
Dharmaraj Raghavan
Keyword(s):  
Energy Density ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Breakdown Strength ◽  
Polymer Nanocomposite ◽  
High Energy ◽  
Polymer Chains ◽  
High Energy Density ◽  
Grafted Nanoparticles ◽  
Grafting From

The synthesis of polymer-grafted nanoparticles (PGNPs) or hairy nanoparticles (HNPs) by tethering of polymer chains to the surface of nanoparticles is an important technique to obtain nanostructured hybrid materials that have been widely used in the formulation of advanced polymer nanocomposites. Ceramic-based polymer nanocomposites integrate key attributes of polymer and ceramic nanomaterial to improve the dielectric properties such as breakdown strength, energy density and dielectric loss. This review describes the ”grafting from” and ”grafting to” approaches commonly adopted to graft polymer chains on NPs pertaining to nano-dielectrics. The article also covers various surface initiated controlled radical polymerization techniques, along with templated approaches for grafting of polymer chains onto SiO2, TiO2, BaTiO3, and Al2O3 nanomaterials. As a look towards applications, an outlook on high-performance polymer nanocomposite capacitors for the design of high energy density pulsed power thin-film capacitors is also presented.

Effect of nanofillers on the crystalline and mechanical properties of EVACO polymer nanocomposites

2021 ◽  
Author(s):  
Gibin George ◽  
H. Manikandan ◽  
T.M. Anup Kumar ◽  
Sam Joshy ◽  
A.C. Sanju ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Nanocomposites
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