Effect of bidispersity in grafted chain length on grafted chain conformations and potential of mean force between polymer grafted nanoparticles in a homopolymer matrix

2011 ◽  
Vol 134 (19) ◽  
pp. 194906 ◽  
Author(s):  
Nitish Nair ◽  
Nathaniel Wentzel ◽  
Arthi Jayaraman
Keyword(s):  
Chain Length ◽  
Potential Of Mean Force ◽  
Grafted Nanoparticles ◽  
Chain Conformations

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.

Approaching the size limit of organometallic layers: synthesis and characterization of highly ordered silver–thiolate lamellae with ultra-short chain lengths

2016 ◽  
Vol 45 (47) ◽  
pp. 18954-18966 ◽  
Author(s):  
Zichao Ye ◽  
Lito P. de la Rama ◽  
Mikhail Y. Efremov ◽  
Jian-Min Zuo ◽  
Leslie H. Allen
Keyword(s):  
Single Crystal ◽  
Chain Length ◽  
Short Chain ◽  
Synthesis And Characterization ◽  
Size Limit ◽  
Chain Conformations ◽  
Chain Lengths

Synthesis of single crystal silver alkanethiolate (any chain length) lamellae with highly ordered chain conformations, interlayer interfaces and intralayer lattices.

Effect of Changing Polymer Chain Length on the Target-Mediated Agglutination of Polymer-Grafted Nanoparticles

2008 ◽  
Vol 41 (4) ◽  
pp. 1570-1576 ◽  
Author(s):  
Philip J. Costanzo ◽  
Nily Dan ◽  
Katherine S. Lancaster ◽  
Carlito B. Lebrilla ◽  
Timothy E. Patten
Keyword(s):  
Chain Length ◽  
Polymer Chain ◽  
Grafted Nanoparticles

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).

Chain flexibility for tuning effective interactions in blends of polymers and polymer-grafted nanoparticles

Soft Matter ◽  
2014 ◽  
Vol 10 (35) ◽  
pp. 6777-6782 ◽  
Author(s):  
Babji Palli ◽  
Venkat Padmanabhan
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Potential Of Mean Force ◽  
Chain Flexibility ◽  
Effective Interactions ◽  
Grafted Nanoparticles ◽  
Dynamics Simulations

We present molecular dynamics simulations of polymer-grafted nanoparticles in a homopolymer matrix to demonstrate the effect of chain flexibility on the potential of mean force (PMF) between various species in the nanocomposite.

Satiation in humans is modulated by fatty acid chain length

2001 ◽  
Vol 120 (5) ◽  
pp. A710-A710
Author(s):  
S LAL ◽  
J MCLAUGHLIN ◽  
O NIAZ ◽  
G DOCKRAY ◽  
A VARRO ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Chain Length ◽  
Fatty Acid Chain Length ◽  
Fatty Acid Chain
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