Journal ArticleDOI
Polymer–nanofiller prepared by high‐energy ball milling and high velocity cold compaction
TLDR
In this article, the authors investigated the effect of varying the process parameters on the compacted material; the compactibility in the compaction bed, the uniformity of compacted surface, the pull-out phenomenon, the springback gradient, the stick-slip phenomenon and the homogeneity of the dispersions of nanoparticles in the polymer powders in the solid state.Abstract:
Compaction of polymer powders and polymer-based nanocomposites by uniaxial high-velocity cold compaction (HVC), by high-energy ball milling (HEBM) and using a novel technique, relaxation assists, was investigated with a focus on the process parameters, the compactibility characteristics, surface morphology and friction. The basic phenomena associated with HVC are explained and the general energy principle is introduced to explain the pull-out phenomenon, springback gradient, delay time, relative time of the pressure wave, and stick-slip phenomenon during the compaction process. Experimental results for different compaction profiles, different particle size distributions and different milling system for polymer-based nanocomposite are presented, showing the effect of varying the process parameters on the compacted material; the compactibility in the compacted bed, the uniformity of the compacted surface, the pull-out phenomenon, the springback gradient, the stick-slip phenomenon and the homogeneity of the dispersions of nanoparticles in the polymer powders in the solid state. It was found that the high-velocity compaction process is an interruption process and that the opposite velocity and pressure loss during the compaction process have a major influence on the quality of the compacted material. The relaxation assist device is a novel technique that has been successfully developed to improve the compaction process. The relaxation assists are parts of the piston and they are regarded as projectile supports. They are constructed of the same material as the piston, and the diameters are the same but the lengths are different. The relaxation assist device leads to an improvement in the compaction of powders, polymer powders and polymer-based nanocomposites by giving a more homogeneous opposite velocity and a better locking of the powder bed in the compacted form during the compaction process with less change in dimensions in the case of both homogeneous and heterogeneous materials. If the movement of the particles is restricted the powder bed attains a higher density and the total elastic springback is minimized. In addition, there is a more homogeneous dispersion of nanoparticles in the case of a heterogeneous material. A much better transfer of the pressure through the powder bed and a smaller loss of pressure lead to a more homogenous stick-slip of the particles and a higher sliding coefficient due to the overall friction during the compaction process.read more
Citations
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Journal ArticleDOI
Fundamentals, processes and applications of high-permittivity polymer–matrix composites
Zhi-Min Dang,Zhi-Min Dang,Zhi-Min Dang,Jinkai Yuan,Jun-Wei Zha,Tao Zhou,Shengtao Li,Guo-Hua Hu,Guo-Hua Hu +8 more
TL;DR: In this paper, the authors focus on the important role and challenges of high-k polymer-matrix composites (PMC) in new technologies and discuss potential applications of highk PMC.
Book ChapterDOI
Organic–Inorganic Polymer Hybrids: Synthetic Strategies and Applications
TL;DR: In this paper, different fabrication routes for generating organic-inorganic polymer hybrid materials are discussed, including blending processes, sol-gel methods, emulsion polymerization and photopolymerization, metallosupramolecular and coordination approaches, intercalation, microwave-assisted and electrochemical synthesis, synthetic routes based on surface grafting, and finally self-assembly and block copolymer-mediated synthetic strategies.
Journal ArticleDOI
pCBT/MWCNT Nanocomposites Prepared by In situ Polymerization of CBT After Solid-Phase High-Energy Ball Milling of CBT with MWCNT
TL;DR: In this paper, the MWCNTs did not affect the crystallinity of the isothermally produced pCBT significantly, but acted as nucleation agents during the crystallization of the material from its melt.
Journal ArticleDOI
Synthesis of dysprosium doped cobalt ferrites nanoparticles by solgel auto-combustion method and influence of grinding techniques on structural, Morphological, and magnetic properties
Chnar Aziz,Bruska Azhdar +1 more
TL;DR: In this article, the synthesis of Dysprosium (Dy3+) doped cobalt ferrite nanoparticles CoFe2−xDyxO4 via solgel auto-combustion route was introduced.
Journal ArticleDOI
Synthesis of dysprosium doped cobalt ferrites nanoparticles by solgel auto-combustion method and influence of grinding techniques on structural, Morphological, and magnetic properties
TL;DR: In this article , the synthesis of Dysprosium (Dy3+) doped cobalt ferrite nanoparticles CoFe2−xDyxO4 via solgel auto-combustion route was introduced.
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Journal ArticleDOI
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