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PREPARATION AND PROPERTIES OF FUMED SILICA/cyanate ester NANOCOMPOSITES

Chinese Journal of Polymer Science 2012年第4期30卷 530-536页

作者： Elhussein A.Taha 吴俊涛郭林 Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry ofEducation School of Chemistry and EnvironmentBeihang University Key Laboratory of Bio-InspiredSmart Interfacial Science and Technology of Ministry of Education School of Chemistry and EnvironmentBeihang University

Fumed silica/bisphenol A dicyanate ester （BADCy） nanocomposites were prepared by introducing different contents of nano-sized fumed SiO2 into the BADCy matrix. Two different average primary particle diameters of 12 and 40 nm were chosen. Dibutyltindilaurate （DBTDL） catalyst was chosen to catalyze the cyanate ester group into triazine group via cyclotrimerization reaction. The SEM micrographs indicated that the fumed SiO2 particles were homogeneously dispersed in the poly（bisphenol A dicyanate） matrix by means of ultrasonic treatment and the addition of a coupling agent. The FTIR spectroscopy shows that, not only DBTDL catalyzes the polymerization reaction but also --OH groups of the SiO2 particles surface help the catalyst for the complete polymerization of BADCy monomer. The thermal stability of the cured BADCy can be improved by adequate addition of fumed SiO2. A slight increase in the dielectric constant and dielectric loss values were identified by testing the dielectric properties of the prepared nanocomposite samples. By increasing the SiO2 content, there was a slight increasing in the thermal conductivity values of the tested samples. The obtained results proved that the fumed silica/BADCy nanocomposites had good thermal and dielectrieal properties and can be used in many applications such as in the thermal insulation field.

关键词： cyanate ester Fumed silica Nanocomposites Thermal conductivity Dielectric properties.

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Morphological, mechanical and thermal properties of cyanate ester/benzoxazine resin composites reinforced by silane treated natural hemp fibers

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1219-1228页

作者： Abdeldjalil Zegaoui Ruikun Ma Abdul Qadeer Dayo Mehdi Derradji Jun Wang Wenben Liu Yile Xu Wan'an Cai Institute of Composite Materials Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

This present study deals with the reinforcement of thermosetting resin blends composed of cyanate ester(CE) and benzoxazine(BOZ) resins with natural hemp fibers(NHFs). These NHFs were initially treated by using a silane coupling agent(SCA) in order to chiefly enhance their distributions as well as adhesions within the CE/BOZ resin matrix,then incorporated with various weight amounts ranging from 5 wt% to 20 wt% with a regular interval of 5 wt%. The obtained results showed that at the maximum treated fiber loading(20 wt%), distinctive enhancements in the mechanical properties in terms of flexural strength and microhardness were obtained. Besides, the thermal stability and glass transition temperature(Tg) were appreciably enhanced and were higher than those of the pure CE/BOZ resin properties. With respect to the astonishing properties of the NHFs, these enhancements could be possibly due to the good dispersion and adhesion of the treated NHFs inside the CE/BOZ resin achieved upon using the SCA. Therefore,we believe herein that these renewable and cheap NHFs have considerable potential to be used as reinfocer materials for CE/BOZ resin composites to be used in various industrial sectors.

关键词： cyanate ester Benzoxazine Hemp fibers Thermal stabilities Mechanical properties

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Tribological behavior of shape memory cyanate ester materials and their tunable friction mechanism

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Friction 2023年第10期11卷 1794-1803页

作者： Zhangzhang TANG Lihe GUO Mingkun XU Hongwei RUAN Jing YANG Tingmei WANG Jianqiang ZHANG Qihua WANG Yaoming ZHANG Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China College of Petrochemical Technology Lanzhou University of TechnologyLanzhou 730050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

High-performance polymer friction materials with tunable tribological behavior to fit varied work conditions remain a challenge of widespread interest for a variety of *** memory polymer exhibits morphing and modulus changing over temperature changing provides a promising material to adjust the friction ***,we investigated the tribological properties of shape memory cyanate ester(SMCE)under different *** SMCE exhibits the tribological behavior of good friction material with stable high coefficient of friction(COF)and a low wear ***,the COF increases and wear rate decreases with the temperature increasing show the tunable friction property of the *** propose a new model of wear-compensation through shape recovery to explain the adjustable friction behavior of thermal-responsive polymer from the aspect of shape recovery and energy *** study provides a high-performance friction material and paves the route for the application of shape memory polymer(SMP)in tribology field with tunable property.

关键词： tribological behavior shape memory polymer cyanate ester tunable friction wear rate

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Characteristics of cyanate ester and Fluorenyl Epoxy-Based Polymer-Ceramic Composites

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Journal of Chemistry and Chemical Engineering 2012年第1期6卷 48-53页

作者： Dong Kook Kim Seong-Dae Park Dong-Seok Seo Woo-Sung Lee Department of Chemistry ＆ Applied Chemistry Hanyang University Ansan 426-791 South Korea Electronic Materials ＆ Device Research Center Korea Electronics Technology Institute Seongnam 463-816 South Korea

In the field of highly integrated printed circuit board （PCB）, the heat resistant substrate with low water absorption is very important material. To get the resin composition for the high functional substrate material with low moisture absorption and high glass transition temperature （Tg） simultaneously, a fluorenyl ＂Cardo＂ epoxy was incorporated into novolac cyanate ester resin. As an optimum curing agent for the fiuorenyl epoxy, methyl nadic anhydride （MNA） was selected. Silica powders as fillers were added into the resin composition. The partial replacement of the cyanate ester resin with the fluorenyl epoxy could reduce the moisture absorption with keeping high glass transition temperature over 300 ℃. The laminate, which was fabricated from prepregs made with 40 wt% silica-filled resin composition and glass fabric, showed high Tg of 317 ℃ and low moisture absorption of 0.57%.

关键词： cyanate ester fluorenyl epoxy silica prepreg composite.

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THE EFFECT OF MOISTRUE ABSORPYION ON PROPERTY OF EPOXY/cyanate ester/GLASS CLOTH COMPOSITE

THE EFFECT OF MOISTRUE ABSORPYION ON PROPERTY OF EPOXY/CYANA...

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作者： Huang Li, Chen Wang The Key Laboratory of Beijing on Preparation and Processing of Novel Polymer Material, Beijing University of Chemical Technology, Beijing 100029 China

＜正＞The effects of moisture absorption on the mechanical and dielectric properties of epoxy/cyanate ester/glass cloth composite are reported. Samples of the material were aged by immersing in 70℃ deionized water. A dynamic mechanical thermal analyzer was used to detect the changes in the glass transition temperature and the modulus of the material induced by moisture ingress. The test of bending and shearing strength indicated that composite was degraded by water ingress. Through comparing hygrothermal properties with hyperthermal properties, it was found that material was more sensitive with moisture than temperature. The dielectric permittivity and dielectric loss tangent of the material increased with the absorption of moisture. The change of dielectric permittivity was not obvious, however, the dielectric loss tangent increased largely.

关键词： Epoxy cyanate ester Moisture absorption Mechanical properties Dielectric properties

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Electroactive Shape Memory cyanate/Polybutadiene Epoxy Composites Filled with Carbon Black

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Chinese Journal of Polymer Science 2016年第4期34卷 466-474页

作者： Kun Wang 朱光明 Xiao-gang Yan Fang Ren Xiao-ping Cui Department of Applied Chemistry Northwestern Polytechnical UniversityXi'an 710129China

Electroactive shape memory composites were synthesized using polybutadiene epoxy （PBEP） and bisphenol A type cyanate ester （BACE） filled with different contents of carbon black （CB）. Dynamic mechanical analysis （DMA）, scanning electron microscopy （SEM）, electrical performance and electroactive shape memory behavior were systematically investigated. It is found that the volume resistivity decreased due to excellent electrical conductivity of CB, in turn resulting in good electroactive shape memory properties. The content of CB and applied voltage had significant influence on electroactive shape memory effect of developed BACE/PBEP/CB composites. Shape recovery can be observed within a few seconds with the CB content of 5 wt% and voltage of 60 V. Shape recovery time decreased with increasing content of CB and voltage. The infrared thermometer revealed that the temperature rises above the glass transition temperature faster with the increase of voltage and the decrease of resistance.

关键词： Electroactive shape memory behaviors cyanate ester Carbon black Electrical performance.

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双噁唑啉对双马来酰亚胺和氰酸酯共混体系的改性研究

双噁唑啉对双马来酰亚胺和氰酸酯共混体系的改性研究

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2014年全国高分子材料科学与工程研讨会

作者：沈宗祎雷毅四川大学高分子科学与工程学院

引言目前关于双马来酰亚胺树脂(BMI)改性氰酸酯(BADCy)的研究人们取得了较大进展,但是由于氰酸酯的催化剂具有强烈的选择性,对双马来酰亚胺的固化几乎没有促进作用,所以这种改性体系的固化温度较高,后处理时间也较长。本文在双马来酰亚... 详细信息

引言目前关于双马来酰亚胺树脂(BMI)改性氰酸酯(BADCy)的研究人们取得了较大进展,但是由于氰酸酯的催化剂具有强烈的选择性,对双马来酰亚胺的固化几乎没有促进作用,所以这种改性体系的固化温度较高,后处理时间也较长。本文在双马来酰亚胺改性氰酸酯体系中加入双噁唑啉(BOX)以期降低树脂的固化温度,改善固化工艺,同时提高其力学性能。BADCy/BMI-BOX三元体系交联树脂的制备将配比量(按重量计,固定BADCy:BMI=3:1)的BOX、BMI、BADCy加入烧杯中加热

关键词： cyanate ester Bisoxazoline Bismaleimides Curing Performance

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