Thermally Induced Demixing in an LCST Mixture in the Presence of Densely Grafted Nanoparticles: Tuning the Graft Chain Length To Induce Thermodynamic Miscibility

2014 ◽  
Vol 47 (21) ◽  
pp. 7525-7532 ◽  
Author(s):  
Goutam Prasanna Kar ◽  
Nafisa Begam ◽  
J. K. Basu ◽  
Suryasarathi Bose
Keyword(s):  
Chain Length ◽  
Thermally Induced ◽  
Grafted Nanoparticles ◽  
Graft Chain

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.

Precisely controlled two-step synthesis of cellulose- graft -poly( l -lactide) copolymers: Effects of graft chain length on thermal behavior

2017 ◽  
Vol 142 ◽  
pp. 226-233 ◽  
Author(s):  
Mi Hee Ryu ◽  
Jeyoung Park ◽  
Dongyeop X. Oh ◽  
Sung Yeon Hwang ◽  
Hyeonyeol Jeon ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Chain Length ◽  
Lactide Copolymers ◽  
Graft Chain

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

Glycine homopeptides: the effect of the chain length on the crystal structure and solid state reactivity

CrystEngComm ◽  
2014 ◽  
Vol 16 (31) ◽  
pp. 7196-7208 ◽  
Author(s):  
Aaron J. Smith ◽  
Farukh I. Ali ◽  
Dmitriy V. Soldatov
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Chain Length ◽  
Molecular Conformation ◽  
Thermally Induced

A series of linear oligoglycines has been studied to reveal the trends in their crystal structure, molecular conformation and thermally induced reactions.

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