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Compressive and Fracture Properties of Syntactic Foam Filled with Hollow Plastic Bead(HPC)

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Journal of Wuhan University of Technology(Materials Science) 2007年第3期22卷 499-501页

作者：谢文锋 School of Materials Science and Engineering Wuhan University of Technology

The compressive mechanical properties of syntactic foams reinforced by hollow plastic beads were studied by the quasi-static compression test. The failure mechanism of syntactic foams was also investigated by macroscopic and microscopic observation on the fractured specimens. The experimental results show that the density of syntactic foams is still the key factor affecting their mechanical properties. The macroscopic and microscopic observation on the fractured specimens indicates that the main failure mode is the elastic-plastic collapse caused by shear.

关键词： foam hollow plastic bead epoxy resin mechanical property failure mechanism

Fiber Loading of Date Palm and Kenaf Reinforced epoxy Composites:Tensile,Impact and Morphological Properties

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Journal of Renewable Materials 2021年第7期9卷 1283-1292页

作者： Syed Waheedullah Ghori G.Srinivasa Rao Department of Mechanical Engineering Acharya Nagarjuna University-College of Engineering and TechnologyGunturAndhra PradeshIndia Department of Mechanical Engineering RVR&JC College of Engineering and TechnologyGunturAndhra PradeshIndia

Date palm fiber(DPF)and kenaf fiber were reinforced in epoxy having various fiber loading 40%,50%,and 60%by *** hybrid samples were manufactured by hot press technique and then characterized for tensile,impact,and morphological behavior to evaluate the ratio of fibers in the hybrid composites;the addition of kenaf improved the tensile properties,Scanning Electron Microscopy(SEM)revealed the interfacial bonding of fiber/matrix,and dispersion and void content in *** test studies reflected the effect of natural fiber with epoxy,level of stress transfer from matrix to reinforced material,and reinforced material’s role in absorbing the *** showed that 50%of DPF had the best shock-absorbing *** obtained results indicated that 30%DPF in hybrid composite showed improved tensile properties and homogeneous distribution of fiber without void content;however,50%DPF loading in hybrid composites had the best impact properties.

关键词： Date palm fibre kenaf fibre epoxy resin tensile properties impact strength and scan electron microscopy

Preparation and Properties of Nano-SiO_2/TDE-85/BMI/BAD Cy Composites

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Journal of Wuhan University of Technology(Materials Science) 2013年第2期28卷 261-264页

作者：吴广磊 KOU Kaichang CHAO Min ZHUO Longhai ZHANG Jiaoqiang School of Science Northwestern Polytechnical University

A new type of the nanometer particles and epoxy/bismaleimide-triazine nanocomposites were prepared using a nanometer silica （nano-SiO2）, a 4,5-epoxycyclohexane 1,2-dicarboxylic acid dilycidyl （TDE-85） epoxy resin, a 4,4＇-bismaleimidodiphenymethane （BMI） and a bisphenol a dicyanate （BADCy）. The properties of nano-SiOJTDE-85/BMI/BADCy composites, such as mechanical and thermal properties, were systemically investigated in detail by mechanical measurement, scanning electron microscope （SEM）, dynamic mechanical analysis （DMA） and thermogravimetric analysis （TGA）. The experimental results showed that the addition of the appropriate amount of nano-SiO： could improve the impact strength and the flexural strength of the nano- SiO2/TDE-85/BMI/BADCy composites. Simultaneously, the thermal stability of the blends was found to be higher than that of the TDE-85/BMI/BADCy copolymers.

关键词： nano-Si02 cyanate ester resin epoxy resin bismaleimide resin mechanical properties thermal properties

Preparation and Characterization of Microcapsules for Self-healing Materials

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Chemical Research in Chinese Universities 2010年第3期26卷 496-500页

作者： LIAO Le-ping ZHANG Wei ZHAO Yang LI Wu-Jun National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 P. R. China

The urea-formaldehyde（UF） capsules filled with a healing agent, a mixture of epoxy resins（epoxy 711 and E-51） as core material, were produced by means of one step in-situ polymerization. The characteristics of these microcapsules were studied via scanning electron microscopy（SEM）, particle size analysis, FTIR and DSC/TGA. The results show that the dispersed and integrated microcapsules of 5 μm in shell thickness were synthesized successfully. The capsules were produced with diameters ranging from 10 to 250 μm via controlling agitation rate. Young＇s modulus of the capsule was a little lower than those of the epoxy resins, but the microcapsules having such a shell thickness were robust enough to survive handling during manufacturing self-healing composites. When damage occurred in the epoxy matrix, the crack could rupture the microcapsule to make the repairing agent release.

关键词： Urea-formaldehyde Microcapsule epoxy resin Self-healing

Biomass-derived dynamic covalent epoxy thermoset with robust mechanical properties and facile malleability

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Chinese Chemical Letters 2022年第6期33卷 3245-3248页

作者： Xiao-Min Ding Li Chen Xi Luo Feng-Ming He Yan-Fang Xiao Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Biomass-derived dynamic covalent thermoset has been considered as a promising solution to the high dependence on fossil resources and the difficulty in recyclability after curing of conventional bisphenol A epoxy ***,the design and preparation of a dynamic covalent biobased epoxy thermoset with both comparable thermal and mechanical performances to bisphenol A epoxy resins and reprocessibility remains a significant ***,based on imine chemistry,a novel Schiff base-containing dynamic covalent epoxy thermoset was facilely fabricated from biobased protocatechualdehyde and synthetic siloxane *** to the more reactive epoxides in the epoxy monomer than in bisphenol A epoxy oligomer,the thermoset exhibited a high cross-linking density,resulting in high thermal stability and glass transition *** rigid aromatic Schiff base moieties endowed the thermoset with excellent mechanical properties:Thanks to the plasticization of the flexible siloxane,the thermoset displayed high impact ***,owing to the high segmental mobility,the fast exchange of imine bonds was guaranteed;and the thermoset was able to be recycled through *** these features,this work provided great potential for designing and preparing sustainable substitutes for bisphenol A epoxy resins in the high-performance applications.

关键词： epoxy resin Dynamic covalent thermoset Protocatechualdehyde Imine chemistry High-performance

A combined interfacial and in-situ polymerization strategy to construct well-defined core-shell epoxy-containing SiO_(2) - based microcapsules with high encapsulation loading, super thermal stability and nonpolar solvent tolerance

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International Journal of Smart and Nano Materials 2016年第4期7卷 221-235页

作者： Yin Jia Haiyan Wang Kesong Tian Ruifei Li Zhaopeng Xu Jiao Jiao Ling Cao Yuehao Wu Key Laboratory of Applied Chemistry of Hebei Province College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdaoP.R.China Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and EngineeringYanshan UniversityQinhuangdaoP.R.China

SiO_(2)-based microcapsules containing hydrophobic molecules exhib-ited potential applications such as extrinsic self-healing,drug delivery,due to outstanding thermal and chemical stability of SiO_(2).However,to construct SiO_(2)-based microcapsules with both high encapsulation loading and long-term structural stability is still a troublesome issue,limiting their further *** herein design asingle-batch route,a combined interfacial and in-situ polymerization strategy,to fabricate epoxy-containing SiO_(2)-based microcapsules with both high encapsu-lation loading and long-term structural *** final SiO_(2)-based microcapsules preserve high encapsulation loading of 85.7 wt% by controlling exclusively hydrolysis and condensed polymerization at oil/water interface in the initial interfacial polymerization *** the subsequent in-situ polymerization step,the initial SiO_(2)-based microcapsules as seeds could efficiently harvest SiO_(2) precursors and primary SiO 2 particles to finely tune the SiO_(2) wall thickness,thereby enhancing long-term structural stability of the final SiO_(2)-based microcapsules including high thermal stability with almost no any weight loss until 250℃,and strong tolerance against nonpolar solvents such as CCl_(4) with almost unchanged core-shell structure and unchanged core weight after immersing into strong solvents for up to 5 *** SiO_(2)-based microcapsules are extremely suited for processing them into anticorrosive coating in the presence of nonpolar solvents for self-healing application.

关键词： SiO_(2)-based microcapsule epoxy resin interfacial polymerization in-situ polymerization

Preparation of Three-Dimensional Carbon Network Reinforced epoxy Composites and Their Thermal Conductivity

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Transactions of Tianjin University 2020年第5期26卷 399-408页

作者： Jing Li Kai Song Hetong Zhang Yue Guo Fang He Naiqin Zhao Chunsheng Shi Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

As a thermosetting resin with excellent properties,epoxy resin is used in many areas such as electronics,transportation,aerospace,and other ***,its relatively low thermal conductivity limits its wide application in more demanding ***,a three-dimensional carbon(3DC)network was prepared through NaCl template-assisted in situ chemical vapor deposition(CVD)and used to reinforce epoxy resin for enhancing its thermal *** 3DC was prepared with a molar ratio of sodium atom to carbon atom of 100:20,and argon atmosphere in CVD led to an optimal improvement in the thermal conductivity of epoxy *** thermal conductivity of epoxy resin increased by 18%when the filling content was 3 wt.%of 3DC network because of the high contact area,uniform dispersion,and enhanced formation of conductive paths with epoxy *** the amount of 3DC addition increases,the thermal conductivity of composites also *** an innovative exploration,the work presented in this paper is of great significance for the thermal conductivity application of epoxy resin in the future.

关键词： Three-dimensional carbon NaCl template epoxy resin Composites Thermal conductivity

PF/EP/Nano-SiO_2 Composite Paint for Resistor

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Transactions of Tianjin University 2009年第4期15卷 283-287页

作者：王秀宇张之圣白天孙谷清王金龙黄翔东 School of Electronic Information Engineering Tianjin University

Phenolic resin(PF) and nano-SiO2 were used to improve the curing property and high humidity resistance of epoxy resin (EP) and methyl nadic anhydride (MNA) resistor paint, respectively. Hydrogen bonds, formed between phenolic resin and nano-SiO2 in alcohol, made nano-SiO2 disperse easily in EP/MNA paint through phenolic resin without being treated by supersonic vibration. When the mass ratio of PF to EP in paint is 3:7, the formed composite paint film can be cured in 2 min at 170 ℃ . When the mass ratio of nano-SiO2 to PF in paint is 3:100, the property of high humidity resistance of the composite paint is the best, meeting the requirement of varying ratio of resistance less than 0.1% after experiment on high humidity resistance. SEM analysis shows the surface of the composite paint film is smooth, glassy, tight and homogeneous, without acicular air holes.

关键词： phenolic resin epoxy resin nano-SiO.~ paint for metal film resistor curing time high humidity resistance

ELASTOMERIC REACTIVE MICROGELS AS TOUGHENER FOR epoxy ADHESIVES

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Chinese Journal of Polymer Science 1987年第1期5卷 76-80页

作者：朱征薛瑞兰余云照 Institute of Chemistry Academia Sinica Beijing

Elastomerie reactive microgels were evaluated as toughener for epoxy adhesives. It turned out that elastomeric microgels can improve lap shear strength and peel strength greatly. The glass transition temperature of the resin matrix was not affected by the presence of dispersed mierogel particles, and thus the microgel-toughened adhesives have a good bond strength at elevated temperatures.

关键词： Microgels Toughener epoxy resin