Can the Miscibility of Telechelic Polymer Solutions Increase with Polymer Chain Length?

2011 ◽  
Vol 1 (1) ◽  
pp. 88-91 ◽  
Author(s):  
Jacek Dudowicz ◽  
Karl F. Freed ◽  
Jack F. Douglas
Keyword(s):  
Chain Length ◽  
Polymer Chain ◽  
Polymer Solutions ◽  
Telechelic Polymer

scholarly journals Diffusive properties of solvent molecules in the neighborhood of a polymer chain as seen by Monte-Carlo simulations

Soft Matter ◽  
2016 ◽  
Vol 12 (25) ◽  
pp. 5519-5528 ◽  
Author(s):  
M. Kozanecki ◽  
K. Halagan ◽  
J. Saramak ◽  
K. Matyjaszewski
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Chain Length ◽  
Polymer Chain ◽  
Polymer Solutions ◽  
Solvent Molecules

The influence of both polymer chain length and concentration on the mobility of solvent molecules in polymer solutions was studied by Monte Carlo simulations with the use of the dynamic lattice liquid (DLL) model.

scholarly journals On the applicability of viscosity-based capillary bundle concepts to predict the penetration behaviour of polymer solutions into sand

2021 ◽  
Author(s):  
Rowena Verst ◽  
Wolfgang Lieske ◽  
Wiebke Baille ◽  
Matthias Pulsfort ◽  
Torsten Wichtmann
Keyword(s):  
Chain Length ◽  
Polymer Chain ◽  
Oil And Gas ◽  
Polymer Solutions ◽  
Bulk Material ◽  
Soil Parameters ◽  
Porous System ◽  
Capillary Bundle ◽  
The Impact ◽  
Penetration Behaviour

AbstractThe increasing use of polymer solutions as support fluids in pile drilling, diaphragm walling or tunnelling applications demands a more detailed discussion of their penetration behaviour and prediction thereof. In this context, the capillary bundle approach can be a useful tool. However, while it is widely discussed in the oil and gas application, the subject is currently addressed only scarcely with regard to support fluid penetration targeting stagnation, where small flow velocities and non-cohesive soil environments are of relevance. In these boundary conditions, the applicability of capillary bundle approaches is not yet sufficiently confirmed and substantiated. The current paper thus reviews current capillary bundle models based on Hagen–Poiseuille in combination with a power-law rheological model and discusses their applicability with respect to support fluid application in the context of experimental soil permeation tests for small gradients ($$i\le 10$$ i ≤ 10 ). Two granular materials of similar grain size, but different angularity (glass beads and sand), and four polymer solutions varying in polymer chain length and concentration are investigated, and the impact of model assumptions and bulk material input variables is systematically discussed. The experimental results show that the theoretical models are generally able to predict the filter velocity qualitatively for values above $${\bar{v}}=5\times 10^{-7}$$ v ¯ = 5 × 10 - 7 m/s and also quantitatively, when an empirical shift factor $$\alpha ^*$$ α ∗ is introduced and water permeability values are determined experimentally. With respect to the influence of soil parameters, it was found that the soil particle roughness decreases the flow velocity of the polymer solution despite similar hydraulic conductivity in water. Polymer chain length and concentration were observed to control the degree of possible dilution ($$\alpha ^*<1$$ α ∗ < 1 ) in the porous system compared to bulk rheological characteristics. It can therefore be concluded that capillary bundle models can indeed be applied in the targeted fields even though they are unable to predict a complete stagnation for $$i>0$$ i > 0 . However, rather than specific model assumptions for tortuosity, taking into account the specific soil-polymer interaction has shown to be of primary importance to ensure no under- or over-prediction of penetration velocities solely based on bulk rheology.

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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