Effect of Polymer Chain Length on the Physical Stability of Amorphous Drug–Polymer Blends at Ambient Pressure

2018 ◽  
Vol 15 (7) ◽  
pp. 2807-2815 ◽  
Author(s):  
Justyna Pacułt ◽  
Marzena Rams-Baron ◽  
Beata Chrząszcz ◽  
Renata Jachowicz ◽  
Marian Paluch
Keyword(s):  
Polymer Blends ◽  
Chain Length ◽  
Polymer Chain ◽  
Ambient Pressure ◽  
Physical Stability ◽  
Amorphous Drug

Effect of surface properties and polymer chain length on polymer adsorption in solution

2021 ◽  
Vol 155 (3) ◽  
pp. 034701
Author(s):  
Emily Y. Lin ◽  
Amalie L. Frischknecht ◽  
Karen I. Winey ◽  
Robert A. Riggleman
Keyword(s):  
Surface Properties ◽  
Chain Length ◽  
Polymer Chain ◽  
Polymer Adsorption ◽  
Effect Of Surface

Effect of Polymer Chain Length on the Superlattice Assembly of Functionalized Gold Nanoparticles

Langmuir ◽  
2021 ◽  
Author(s):  
Hyeong Jin Kim ◽  
Wenjie Wang ◽  
Honghu Zhang ◽  
Guillaume Freychet ◽  
Benjamin M. Ocko ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Chain Length ◽  
Polymer Chain ◽  
Functionalized Gold 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.

scholarly journals Preventing iron(ii) precipitation in aqueous systems using polyacrylic acid: some molecular insights

2018 ◽  
Vol 20 (26) ◽  
pp. 18056-18065 ◽  
Author(s):  
Pierre-Arnaud Artola ◽  
Bernard Rousseau ◽  
Carine Clavaguéra ◽  
Marion Roy ◽  
Dominique You ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Chain Length ◽  
Polymer Chain ◽  
Polyacrylic Acid ◽  
Nuclear Power ◽  
Molecular Simulations ◽  
Aqueous Systems ◽  
Coolant Circuit ◽  
Secondary Coolant Circuit

We show that molecular simulations are able to describe iron(ii) complexation by polyacrylic acid, thus preventing oxide precipitation in the secondary coolant circuit of nuclear power plant. Complexation is favoured with increasing polymer chain length.

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