Interfacial lubricating effect in phase coarsening of polyethylene/polycaprolactone/polyethylene oxide tri‐continuous polymer blends

2021 ◽  
Author(s):  
Mehdi Haji Abdolrasouli ◽  
Ebrahim Jalali Dil ◽  
Jamshid Khorshidi Mal Ahmadi
Keyword(s):  
Polymer Blends ◽  
Polyethylene Oxide ◽  
Phase Coarsening

Study of the morphology and texture of poly(ε-caprolactone)/polyethylene oxide blend films as a function of composition and the addition of nanofillers with different functionalities

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59354-59363 ◽  
Author(s):  
Andrea Causa ◽  
Giovanni Filippone ◽  
Concepción Domingo ◽  
Aurelio Salerno
Keyword(s):  
Surface Morphology ◽  
Polymer Blends ◽  
Polyethylene Oxide ◽  
Semicrystalline Polymer ◽  
Solvent Casting ◽  
Polymer Content ◽  
Blend Films ◽  
Starting Solution

Aiming to prepare films of semicrystalline polymer blends through solvent casting, the surface morphology and texture can be tuned by varying the polymer content and/or adding nanoparticles to the starting solution.

The effect of chain mobility on the coarsening process of co-continuous, immiscible polymer blends under quiescent melt annealing

2017 ◽  
Vol 19 (20) ◽  
pp. 12712-12719 ◽  
Author(s):  
Tao Gong ◽  
Rui-Ying Bao ◽  
Zheng-Ying Liu ◽  
Bang-Hu Xie ◽  
Ming-Bo Yang ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Immiscible Polymer Blends ◽  
Phase Coarsening ◽  
Chain Mobility ◽  
Immiscible Polymer ◽  
Melt Annealing ◽  
The Relationship

The relationship between the mobility of polymer molecular chains and the phase coarsening process of co-continuous, immiscible polymer blends under quiescent melt annealing is presented.

Modeling and Simulation of the Process for the Generation of Gradient Porous Structures From Immiscible Polymer Blends

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Hangming Shen ◽  
Donggang Yao ◽  
Wei Zhang ◽  
Qian Ye
Keyword(s):  
Polymer Blends ◽  
Phase Field ◽  
Phase Structure ◽  
Porous Polymers ◽  
Porous Structures ◽  
Immiscible Polymer Blends ◽  
Thermal Boundary Conditions ◽  
Phase Coarsening ◽  
Phase Structures ◽  
Gradient Phase

Abstract There has been growing interest in integrating gradient porous structures into synthetic materials like polymers. One particular method for making gradient porous polymers is nonisothermal annealing of co-continuous phase structures of immiscible polymer blends under well-defined thermal boundary conditions. In this paper, we report a method to simulate this nonisothermal phase coarsening process for the generation of gradient-phase structures by the combined implementation of phase-field transport and momentum transport. Specifically, a phase-field equation is solved first to obtain a phase structure with phase size comparable with that of the blend to be annealed. This phase structure is then used as an initial geometry in a two-phase moving-interface flow simulation to gauge into the phase structure coarsening process. Several case studies were performed, and the results show that the controllable generation of gradient-phase structures can be enabled by well-designed geometry and thermal boundary conditions. Using 2D simulations, different types of gradient-phase structures experimentally observed were predicted. With increasing power in computation, the capability of 3D simulation may be unveiled for a more accurate prediction of the nonisothermal phase coarsening process and may ultimately evolve into a useful tool for the design and processing of gradient porous polymers.

Suppression of phase coarsening in immiscible, co-continuous polymer blends under high temperature quiescent annealing

Soft Matter ◽  
2014 ◽  
Vol 10 (20) ◽  
pp. 3587 ◽  
Author(s):  
Xi-Qiang Liu ◽  
Ruo-Han Li ◽  
Rui-Ying Bao ◽  
Wen-Rou Jiang ◽  
Wei Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Polymer Blends ◽  
Phase Coarsening

Modeling and Simulation of the Phase Coarsening Process for Cocontinuous Polymer Blends

2020 ◽  
Author(s):  
Hangming Shen ◽  
Donggang Yao
Keyword(s):  
Polymer Blends ◽  
Structural Control ◽  
Computational Models ◽  
Flow Model ◽  
Moving Boundary ◽  
Load Transfer ◽  
Melt Processing ◽  
Immiscible Polymer Blends ◽  
Phase Coarsening ◽  
Coarsening Kinetics

Abstract Among different phase structures in immiscible polymer blends, the cocontinuous phase structure is considered to be advantageous for load transfer and achieving good mechanical properties. Due to the presence of an interpenetrating interface, phase coarsening naturally occurs during melt processing of cocontinuous polymer blends, and harness of the coarsening kinetics is important for structural control. Existing models for phase coarsening are mostly founded on the basis of scaling or dimensional analysis while computational models embodying more realistic phase geometries are demanded. In this paper, we present a two-step computational approach for prediction of the coarsening kinetics. First, a phase-field transport equation is solved to establish an initial phase geometry. Second, a moving-boundary flow model is implemented to solve the hydrodynamic problem. Case studies are presented both in 2D and in 3D domains. An empirical model on the basis of fractional calculus is also proposed to fit the computational results. Once verified by experimental data, this approach can provide an integrated tool for assisting in the processing of cocontinuous polymer blends where phase coarsening is of concern.

Suppressing phase coarsening in immiscible polymer blends using nano-silica particles located at the interface

RSC Advances ◽  
2015 ◽  
Vol 5 (91) ◽  
pp. 74295-74303 ◽  
Author(s):  
Jian-Ming Feng ◽  
Xi-Qiang Liu ◽  
Rui-Ying Bao ◽  
Wei Yang ◽  
Bang-Hu Xie ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Silica Particles ◽  
Nano Silica ◽  
Immiscible Polymer Blends ◽  
Phase Coarsening ◽  
Immiscible Polymer

Coalescence suppressing effect of nanoparticles at the interface of polymer blends.

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

A quantitative image analysis method for the determination of cocontinuity in polymer blends

1993 ◽  
Vol 51 ◽  
pp. 894-895
Author(s):  
William A. Heeschen
Keyword(s):  
Image Analysis ◽  
Polymer Blends ◽  
Quantitative Measurement ◽  
Morphological Evolution ◽  
Phase Ratio ◽  
Irregular Shapes ◽  
Quantitative Image ◽  
Discrete Domains ◽  
A Domains

Two new morphological measurements based on digital image analysis, CoContinuity and CoContinuity Balance, have been developed and implemented for quantitative measurement of morphology in polymer blends. The morphology of polymer blends varies with phase ratio, composition and processing. A typical morphological evolution for increasing phase ratio of polymer A to polymer B starts with discrete domains of A in a matrix of B (A/B < 1), moves through a cocontinuous distribution of A and B (A/B ≈ 1) and finishes with discrete domains of B in a matrix of A (A/B > 1). For low phase ratios, A is often seen as solid convex particles embedded in the continuous B phase. As the ratio increases, A domains begin to evolve into irregular shapes, though still recognizable as separate domains. Further increase in the phase ratio leads to A domains which extend into and surround the B phase while the B phase simultaneously extends into and surrounds the A phase.

Short Communication: Synthesis of Polymer-Embedded Metal Clusters by Thermolysis of Mercaptides—Polymer Blends

Polymer News ◽  
2005 ◽  
Vol 30 (9) ◽  
pp. 296-300
Author(s):  
F. Esposito ◽  
V. Casuscelli ◽  
M. V. Volpe ◽  
G. Carotenuto ◽  
L. Nicolais
Keyword(s):  
Polymer Blends ◽  
Short Communication ◽  
Metal Clusters ◽  
Communication Synthesis
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