high pressure crystallized
Natural and experimental high-pressure, shock-produced …
The occurrence of high-pressure clinoenstatite embedded in amorphous silicate and associated with majorite and ringwoodite suggests that the assemblage was …
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On the structure and nucleation mechanism in nucleated isotactic
The nucleated PP was isothermally crystallized in the γ-form under pressure of 200 and 300 MPa and studied ex-situ by WAXD, PLM and SEM. Analysis of lamellar structure provided insight into the nucleation mechanism of high pressure crystallization of PP. In all the materials the α-lamellae were nucleated first and served …
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Extended-Chain Crystals of High-Pressure Crystallized Poly …
High-pressure crystallized PET samples were readily fractured at the interface of lamellar crystals perpen-dicular to c axis, which displayed the (001) plane and
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Expecting the unexpected: high pressure
This work shows that there is a simple but novel method to improve the performance of bio-TENGs, which not only determines the relationship between the …
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High-pressure synthesis of crystalline polyethylene using optical
The complete transformation of the monomer into a high-quality crystalline polymer, and the simple reaction conditions of high-pressure and optical catalysis, make this method extremely appealing ...
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Improved resistance to wear and fatigue fracture in high pressure
There was also a 50% difference between the wear rate of the virgin high pressure crystallized UHMWPE at 14 mg/MC and those of the high pressure crystallized vitamin E-containing UHMWPEs at about 7.5 mg/MC, even though the latter had on average higher elongation at break. These results suggest that the wear fibril break-up theory that …
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10 Career Options For Individuals With High Fluid Intelligence
Crystallized intelligence plays a crucial role in the work of engineers, who use their knowledge of mathematical concepts, physical principles, and engineering practices to design and build complex systems. ... surgeons need to think critically and solve problems in a high-pressure environment, which to a large extent requires fluid ...
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High-pressure crystallization and properties of diamond …
Recently it has been found that diamond synthesis under high-pressure, high-temperature conditions using catalysts based on magnesium demonstrates a number of intriguing characteristics such as an …
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Microstructure and magnetic properties of hot-deformed
The results show that the amorphous powders would suffer varying degrees of crystallization even below the crystallization point during the SPS process under high pressure. And the pre-crystallized grains in precursors have great impacts on the microstructure and magnetic properties of the hot-deformed magnets.
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High Pressure Crystallized UHMWPEs
Introduction. High-pressure crystallization refers to a type of crystallization in which a semicrystalline polymer such as UHMWPE is heated to a temperature …
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Crystallization of Polyethylene M y
8 for a pressure crystallized ultra-high molecular weight PE (UHMW-PE). Fibrous bands of long fibrils and bands of thick fibrils closely spaced were observed by electron microscopy for pressure- ...
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Polymers | Free Full-Text | Plastic Deformation of High …
The reference samples, crystallized under conventional conditions, as well as samples crystallized under high pressure, composed of extended-chain lamellae, were deformed at room …
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The high-pressure crystallization behaviours and piezoelectricity …
The high pressure d.t.a. thermograms, recorded at various pressures in the heating process with heating rate at 5°C min −1, of P(VDF/TrFE) (86 14) and (94 6) are shown in Fig. 2 Fig. 3, respectively.The samples used in this experiment were crystallized at high pressure in advance to temperature scanning: in order to grow β-ECCs the …
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Improved piezoelectricity in thick lamellar β‐form crystals of poly
Poly(vinylidene fluoride) (PVDF) was crystallized under high pressures on the basis of the pressure‐temperature (P‐T) phase diagram obtained recently, and piezoelectric and ferroelectric properties of the resulting films were evaluated. Crystallization in the metastable hexagonal phase appearing at high pressure and temperature below …
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High‐pressure crystallization of poly(vinylidene fluoride)
The pressure‐quenching experiments were performed in a high‐pressure piston‐cylinder system and in a high‐pressure DTA system; a comparison is made of the results obtained by both methods. Topics. Differential thermal analysis, Crystallization, Polymers. This content is only available via PDF.
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Effect of molecular weight on high pressure crystallization of linear
Ten linear polyethylenes ranging from M w = 4.9 × 10 4 to 4.6 × 10 6 were crystallized in a dilatometer at 0.51 GPa and 242°C and then cooled slowly. Volume vs time data were used to follow the kinetics of the crystallization. The dilatometer data for the isothermal part of the crystallization were fitted to the Avrami equation.
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High Pressure Crystallized UHMWPEs
High-pressure crystallization (HPC) refers to a type of crystallization, in which a semicrystalline polymer such as ultra-high molecular weight polyethylene (UHMWPE) is heated to a temperature exceeding its melting temperature, subjected to hydrostatic …
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The crystallization behaviour and phase diagram of
The poled film of the high-pressure crystallized PVDF composed of,3-ECCs such as sample K was found to have strong piezoelectricity and large electromechanical coupling factor kt of about 0.27, the largest value ever realized in PVDF. The piezoelectricity was found to be stable even at 2007. The piezoelectricity and related properties of high ...
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High-Pressure Crystallization of iPP Nucleated with …
The present paper focuses on the influence of DMDBS on nucleation of high-pressure crystallization of iPP. iPP with 0.2–1.0 wt.% of the DMDBS was crystallized under …
ادامه مطلبMelting and Crystallization of Poly(vinylidene fluoride) in
Characterization of the pressure-crystallized blend sample with different weight fractions of PVF 2 between 1.0 and 0.5 was performed at atmospheric pressure by DTA,
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High-pressure annealing driven nanocrystal formation in Zr
A previous study on high-pressure annealing 6 showed that Zr 2 Cu was crystallized as the first phase by annealing the Zr 55 Al 10 Ni 5 Cu 30 BMG at 5 GPa, which is generally the same ...
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Pressure-Induced Crystallization and Phase …
High-pressure physics and chemistry offer innovative strategies to synthesize new materials for various applications 1, 2, 3. One such strategy is the crystallization of …
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High-pressure crystallization of iPP nanocomposites with
High-pressure crystallization of iPP nanocomposites with montmorillonite and carbon nanotubes - ScienceDirect. Thermochimica Acta. Volume 716, October 2022, …
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Recent advance in high-pressure solid-state metathesis reactions
High-pressure confining environment thermodynamically favors an ion-exchange process between metal atom and boron atom, and successfully results in the formation of well-crystalized metal nitrides with potential applications. ... Well-crystallized plate-like Re 3 N crystals were synthesized through an HPSSM reaction between …
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Properties and Applications of the Phase Poly(vinylidene …
The high-pressure-crystallized PVDF including both the low-melting and high-melting phase was indicated in a detailed study [25,26]. Quenching and then annealing of the PVDF films can induce the crystallization of 1phase directly …
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New study: Nitrogen forms extremely unusual structures under high pressure
The high-pressure syntheses described in the journal Angewandte Chemie show that the diversity of possible nitrogen compounds and their structures is far greater than the behavior of nitrogen ...
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High Pressure Crystallized UHMWPEs
In general, high-pressure crystallized PE contains a mixed morphology of both ECCs and chain-folded crystals, evident from two separate atmospheric melting peaks observed by Wunderlich and Arakawa in PE crystallized in a range of 280–380 MPa [28]. The higher melting peak was associated with ECCs while the lower peak was associated …
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Melting and Crystallization of Poly( ethylene adipate) under …
high pressure crystallized sample was studied at 0.1 MPa by wide angle X-ray diffraction (WAXD) measurement and DSC. The W AXD pattern of PEA changes with increasing crystallization pressure.
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Anomalous high-pressure behavior of amorphous selenium from
The behavior of amorphous materials under pressure is a problem of great current interest. Unusual behavior, such as pressure-induced amorphization of crystalline forms, pressure-induced polyamorphism low- to high-density forms of insulating and metallic glasses, and the dynamics of pressure-induced crystallization are reported but …
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Highly crystallized poly (lactic acid) under high pressure
Tools. Biodegradable poly (lactic acid) (PLA) usually has a crystallinity less than 10% due to its poor crystallization ability. In this work, we found high pressure …
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