Experimental study on thermal expansion coefficient of composite multi-layered flaky gun propellants

Liang, Taixin; Le, Qi; Ma, Zhongliang; Xiao, Zhongliang; Wang, Yang; Liu, Hu; Zhang, Jiaoxia; Guo, Zhanhu; Liu, Chuntai; Xie, Wei; Ding, Tao; Lü, Na

doi:10.1016/j.compositesb.2019.02.024

Cited by 72 publications

(19 citation statements)

References 72 publications

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“…It was ascribed that MWCNTs assembled in polymer brush intervals and distributed homogeneously and uniformly in EP thermosets, and more thermal conductive path were generated, as decipited in Figure C. Besides, the heat transport mainly depended on the highly heat conductive filler particles . The results indicated that the thermal conductivity of the obtained EP/MF‐APP thermosets was effectively enhanced.…”

Section: Resultsmentioning

confidence: 92%

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Leng

Sun

et al. 2019

Polymers for Advanced Techs

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Fire safety and thermal dissipation performance of epoxy resins thermosets were critical for its application in key fields such as electronic devices. The simultaneous improvement of flame retardant and thermal conductivity properties were still a challenge. Herein, ammonium polyphosphate (APP) was firstly encapsulated with 5-wt% epoxy resins based on APP and then surface grafted with polyurethane polymer chain, and the resulting APP with core-shell-brush structure was constructed. Finally, the multiwalled carbon nanotube (MWCNT) was assembled in the intervals of polymer brush on APP surface, and the prepared filler was defined as MF-APP. Its chemical structure and morphologies were characterized and confirmed. The wettability of MF-APP was evaluated by water contact angles tests (WCA) and MF-APP exhibited hydrophobic property with the WCA of 138°. When 9-wt% MF-APP was incorporated into EP thermosets, the thermal conductive value of EP/MF-APP achieved 1.02 Wm −1 K −1 , and the MWCNTs concentration was only 1.8 wt% in thermosets.Compared with the previous work, the prepared EP/MF-APP thermosets exhibited outstanding thermal conductive efficiency because of the homogeneously distribution of MWCNTs. Moreover, the samples fulfilled UL-94 V-0 grade during vertical burning tests with the limiting oxygen index of 30.8%. As a result, the thermal conductivity and flame retardancy of EP thermosets were simultaneously enhanced with a relatively low addition amount of MF-APP, which would bring more chance for wider application of EP thermosets in key fields. KEYWORDS core-shell-brush structure, epoxy resin, flame retardancy, thermal conductivity 1 | INTRODUCTION Epoxy resin (EP) has been widely used in electronic and electrical industries, especially in printed circuit board (PCB) because of its exciting properties such as corrosion resistance, electrical insulation, and high strength. 1-3 With the development of electronic devices toward miniaturization and integration, a large number of heat fluxes in electronic equipment are generated during operation process. It is crucial for the devices that the produced heat can be effectively dissipated. However, EP thermosets exhibit low intrinsic thermal conductivity of 0.1 to 0.4 Wm −1 K −1 . 4-6 Besides, the fire risk is a significant drawback of the EP thermosets. Considering the public safety and the requirement of electronic devices, the simultaneous improvement of thermal conductivity and flame retardancy for the EPs thermosets is becoming an urgent problem and has attracted a lot of attention over the years.To enhance the thermal conductivity, the traditional highly thermally conductive fillers (~5000 Wm −1 K −1 ) such as aluminum oxide, 7,8 whiskers, 9 nanosilica, 10 and aluminum nitride 11 are generally incorporated into the polymeric material. However, the high loading amount (about 30%-60% by volume) is required to fulfill the thermal conductivity (>1 Wm −1 K −1 ). Besides, the high addition amount of filler would deteriorate the processing and the mechanical properties...

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Section: Resultsmentioning

confidence: 92%

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Leng

Sun

et al. 2019

Polymers for Advanced Techs

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“…The thermal properties of the ILs determine the thermal stability of the ionogels. [79,80] In most cases, the thermal properties of ILs refer to the melting temperature (T m ) of ILs. The T m of ILs is an important indicator for distinguishing between ILs and conventional salts.…”

Section: The Thermal Propertiesmentioning

confidence: 99%

Overview of Ionogels in Flexible Electronics

Zhang

Jiang

Dong

et al. 2020

The Chemical Record

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Ionogels have aroused wide interests in the field of flexible electronics. The combination of solid‐state networks and ionic liquids opens up thousands of possibilities for ionogels. The unique structures of ionogels endow them excellent mechanical properties, conductivity and thermal stability to approach the challenge of flexible electronic. A large number of new ionogels have been developed by different methods including the exchange of solution, polymeric ionic liquid and in‐situ reactions in ionic liquids (gelation of low molecular weight gelators, self‐assembly of block polymers, formation of double‐network structure, ionogel nanocomposites and direct polymerization of polymerizable monomers). The aim of this review is to discuss different preparation methods of ionogels and the comparison of their advantages.

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“…With the rapid development of industry, materials, energy, printing and agriculture, a large amount of sewage and other pollutants is directly discharged without being purified or purification treatment . This fails to meet the discharge standards and causes severe damages to the water environment.…”

Section: Introductionmentioning

confidence: 99%

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

Pan

Tian

et al. 2019

The Chemical Record

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With the rapid development of industry and agriculture and the greatly improved living conditions, the resultant gradually deteriorated environments threaten the human beings. Refractory or even toxic pollutants, which are from different industries such as printing and dyeing, pesticides, chemicals, petrochemicals, plastics and rubber, seriously threat the ecosystems and human health. Having the advantages of flexible composition, unique structure, high stability, memory effect, easy preparation and low cost, hydrotalcite compounds have a great potential in sewage degradation and environmental protection. This study focuses on the adsorption and catalytic properties (such as photocatalysis, electrocatalysis and photoelectrocatalysis) of hydrotalcite-derived materials for treating organic, inorganic and heavy metal ion sewage. The types of adsorption and catalysis, and the effects of various influencing factors on the degradation efficiency were discussed as well.Wiley Online Library 355 Figure 13. The photoelectrocatalytic mechanism of organic pollutant MB over the ZNI-1-MMO-1.5 V photoelectrode.

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Experimental study on thermal expansion coefficient of composite multi-layered flaky gun propellants

Cited by 72 publications

References 72 publications

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Overview of Ionogels in Flexible Electronics

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

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