Mussel-Inspired and Magnetic Co-functionalization of Hexagonal Boron Nitride in Poly(vinylidene fluoride) Composites Toward Enhanced Thermal and Mechanical Performance for Heat Exchangers

2018 ◽  
Vol 10 (40) ◽  
pp. 34674-34682 ◽  
Author(s):  
Chunyu Du ◽  
Mei Li ◽  
Min Cao ◽  
Shasha Song ◽  
Shichao Feng ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Heat Exchangers ◽  
Vinylidene Fluoride ◽  
Mechanical Performance ◽  
Hexagonal Boron Nitride ◽  
Poly Vinylidene Fluoride

scholarly journals Mechanical properties of boron nitride sheet with randomly distributed vacancy defects

2019 ◽  
Vol 8 (1) ◽  
pp. 210-217 ◽  
Author(s):  
Yingjing Liang ◽  
Hongfa Qin ◽  
Jianzhang Huang ◽  
Sha Huan ◽  
David Hui
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Performance Optimization ◽  
Fracture Strain ◽  
Mechanical Performance ◽  
Hexagonal Boron Nitride ◽  
Stable Configuration ◽  
Vacancy Defects ◽  
And Performance ◽  
Dynamics Simulations

Abstract Defects and temperature effects on the mechanical properties of hexagonal boron nitride sheet (h-BN) containing randomly distributed defects are investigated by molecular dynamics simulations and the reasons of the results are discussed. Results show that defect deteriorate the mechanical performance of BNNS. The mechanical properties are reduced by increasing percentage of vacancy defects including fracture strength, fracture strain and Young’s modulus. Simulations also indicate that the mechanical properties decrease with the temperature increasing. Moreover, defects affect the stable configuration at high temperature. With the percentage of defect increases the nanostructures become more and more unstable. Positions of the defect influent the mechanical properties. The higher the temperature and the percentage of defect are, the stronger the position of the randomly distributed defect affects the mechanical properties. The study provides a theoretical basis for the preparation and performance optimization of BNNSs.

scholarly journals Multiple-Step Melting/Irradiation: A Strategy to Fabricate Thermoplastic Polymers with Improved Mechanical Performance

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1812
Author(s):  
Jingxin Zhao ◽  
Jiayao Wang ◽  
Xiaojun Ding ◽  
Yu Gu ◽  
Yongjin Li ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Vinylidene Fluoride ◽  
Mechanical Performance ◽  
Crosslinking Density ◽  
Nucleation Density ◽  
Thermoplastic Polymers ◽  
3 Dimensional ◽  
Dimensional Network ◽  
Poly Vinylidene Fluoride ◽  
Multiple Step

To fabricate thermoplastic polymers exhibiting improved ductility without the loss of strength, a novel multiple-step melting/irradiation (MUSMI) strategy was developed by taking poly(vinylidene fluoride)/triallyl isocyanate (PVDF/TAIC) as an example, in which alternate melting and irradiation were adopted and repeated for several times. The initial irradiation with a low dose produced some local crosslinked points (not 3-dimensional network). When the specimen was reheated above the melting temperature, they redistributed in the PVDF matrix, which is an efficient way to avoid the high crosslinking density at certain positions and the disappearance of thermoplastic properties. During the subsequent cooling process, the crosslinked domains in the thermoplastic polymer matrix is expected to play double roles in turning crystal structures for enhancing the ductility without reducing strength. On one hand, they can act as heterogeneous nucleation agents, resulting in higher nucleation density and smaller spherulites; on the other hand, the existence of crosslinked structures restricts the lamellar thickening, accounting for the thinner crystal lamellae. Both smaller spherulites and thinner lamellae contribute to better ductility. At the same time, these local crosslinked points enhance the connectivity of crystal structures (including lamellae and spherulites), which is beneficial to the improvement of strength. Based on the influence of local crosslinked points on the ductility and strength, thermoplastic PVDF with much higher elongation at break and comparable yielding stress (relative to the reference specimen upon strong irradiation only once) was prepared via MUSMI successfully.

scholarly journals Nanocomposite Polymer Electrolytes for Zinc and Magnesium Batteries: From Synthetic to Biopolymers

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4284
Author(s):  
María Fernanda Bósquez-Cáceres ◽  
Sandra Hidalgo-Bonilla ◽  
Vivian Morera Córdova ◽  
Rose M. Michell ◽  
Juan P. Tafur
Keyword(s):  
Polymer Electrolytes ◽  
Large Scale ◽  
Vinylidene Fluoride ◽  
Mechanical Performance ◽  
Rechargeable Batteries ◽  
Practical Applications ◽  
Nanocomposite Polymer ◽  
Multivalent Ions ◽  
Poly Vinylidene Fluoride ◽  
Nanocomposite Polymer Electrolytes

The diversification of current forms of energy storage and the reduction of fossil fuel consumption are issues of high importance for reducing environmental pollution. Zinc and magnesium are multivalent ions suitable for the development of environmentally friendly rechargeable batteries. Nanocomposite polymer electrolytes (NCPEs) are currently being researched as part of electrochemical devices because of the advantages of dispersed fillers. This article aims to review and compile the trends of different types of the latest NCPEs. It briefly summarizes the desirable properties the electrolytes should possess to be considered for later uses. The first section is devoted to NCPEs composed of poly(vinylidene Fluoride-co-Hexafluoropropylene). The second section centers its attention on discussing the electrolytes composed of poly(ethylene oxide). The third section reviews the studies of NCPEs based on different synthetic polymers. The fourth section discusses the results of electrolytes based on biopolymers. The addition of nanofillers improves both the mechanical performance and the ionic conductivity; key points to be explored in the production of batteries. These results set an essential path for upcoming studies in the field. These attempts need to be further developed to get practical applications for industry in large-scale polymer-based electrolyte batteries.

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