Studies on conductivity of acrylonitrile‐butadiene rubber/LiClO4 composite and its modification by adding epoxy resin

Solid polymer electrolytes based on acrylonitrile‐butadiene rubber (NBR) and LiClO₄ were prepared and their conductivity was evaluated. The effect of nitrile group ? CN/LiClO₄ mole ratio on the conductivity was investigated. The maximum conductivity of 1.21 × 10^?4 S cm^?1 (20°C) was achieved in the NBR/LiClO₄ composite at the ? CN/LiClO₄ mole ratio of 1/2.5, which was in accordance with the strongest coordination between ? CN and Li⁺ indicated by Fourier transform infrared spectrometry measurement. The conductivity was further increased by two to three times when 30 phr epoxy resin was introduced into NBR, and the conductivity could retain around the maximum value with the ? CN/LiClO₄ mole ratio ranged from 1/2.5 to 1/3.5, while the conductivity of NBR/LiClO₄ composite existed a decrease in the same range. Field emission scanning electron microscopy and atomic force microscopy characterization showed that epoxy resin significantly improved the dispersion of LiClO₄, leading to better surface smoothness of NBR/epoxy resin/LiClO₄ composite film and contributing to the increase of ionic conductivity. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

多面体低聚倍半硅氧烷在环氧树脂改性中的应用进展

综述了近几年多面体低聚倍半硅氧烷(POSS)在环氧树脂改性中的应用。POSS单独修饰环氧树脂,可提高其力学性能及热稳定性能;POSS协同9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物等功能性分子一起修饰环氧树脂,可增强其阻燃性能;POSS与碳纳米管、石墨烯等纳米材料共同修饰环氧树脂,可提高纳米材料在环氧树脂中的分散性,改善纳米复合材料的导电能力和黏结强度等性能;POSS与纤维共同修饰环氧树脂,可有效增强纤维与环氧树脂间的界面性能。最后展望了POSS修饰改性环氧树脂的未来方向:开发更简易的引入方式,引入更多样的官能分子,协同多种纳米材料修饰环氧树脂。     

端异氰酸酯聚丁二烯液体橡胶初步表征及应用

用ＩＲ光谱和分子量变化初步表征端异氰酸酯聚丁二烯液体橡胶（ＩＴＰＢ）,用ＩＲ证明了ＩＴＲＢ改性环氧树脂Ｅ—４４化学键合作用的存在。ＩＴＲＢ改性环氧树脂抗冲击强度与剪切强度的结果表明ＩＴＲＢ最佳用量在２４份左右。ＩＴＲＢ在水力机械、电子灌封及建筑防水行业的优异使用性能展示了ＩＴＲＢ良好的应用前景     

脂环族环氧树脂／双酚A环氧树脂共混改性研究

采用脂环族环氧树脂（EPL-4221）与双酚A型环氧树脂E-51共混,用酸酐固化剂和促进剂使其固化,研究脂环族环氧树脂的用量对共混树脂性能的影响及其规律性,包括冲击强度、弯曲强度、拉伸强度、维卡软化点温度、漆膜的粘附力、铅笔硬度、耐磨性以及拉伸剪切强度。结果表明,随脂环族环氧树脂用量的增加,共混树脂的综合性能先增加后降低,脂环族环氧树脂的质量分数为15％-20％时,具有最大值。     

环氧树脂的水性化

对环氧树脂水性化的主要进展进行了综述,侧重对水性环氧乳化技术、成膜机理及一些相关问题进行了简单分析.     

木质素基环氧树脂的合成与应用

木质素是一种储量丰富的多酚类天然高分子材料,以木质素为原料合成的木质素基环氧树脂具有原料可再生、成本低、可降解等特点。本文从木质素直接环氧化以及通过酚化、酯化、丙氧基化等改性后再环氧化这2方面综述了木质素基环氧树脂的合成与应用,并对其未来的发展进行了展望。     

端羟基聚丁二烯丙烯腈改性水性聚氨酯的制备及性能研究

以端羟基聚丁二烯丙烯腈(HTBN)和聚己二酸-1,4丁二醇酯二醇(PBA)为软段,合成了阴离子型水性聚氨酯(WPU),并讨论了不同HTBN用量对WPU性能的影响。红外光谱表征了HTBN和WPU的结构;粒径、DSC、XRD、TG及拉伸测试表明:随着HTBN含量的增加,乳液的平均粒径、胶膜的拉伸强度和断裂伸长率呈先增加后降低的趋势,耐热性能得到明显提升,而结晶性却表现出略微的降低;当软段中HTBN质量分数为30%时,乳液平均粒径最大,为250 nm;当软段中HTBN质量分数为40%时,拉伸强度和断裂伸长率最高,分别为20.2 MPa和521%;而相比于WPU0,WPU2和WPU5的结晶度仅从26.1%降低到24.9%和19.5%。     

端氨基丁腈橡胶增韧环氧-聚酰胺胶粘剂的研究

通过DSC,扫描电镜分析及剪切和剥离强度性能测试研究了端氨基液体丁腈橡胶(ATBN)改性环氧-聚酰胺体系的固化动力学,粘接性能及增韧相态。结果表明,根据Ellerstein法和峰值法计算得到的固化反应活化能分别为为73.6 kJ/mol和65.7 kJ/mol,体系最佳固化温度为41～97℃。固化体系中橡胶相粒径大小对胶粘剂性能有较大影响,60℃和室温固化体系分散相粒子平均粒径分别为1～2μm,0.5μm。粒径1～2μm时体系的增韧效果最佳,粘接性能优异。     

水性环氧固化剂改性技术研究进展

概述了水性环氧固化剂的改性原理,介绍了Ⅰ型和Ⅱ型水性环氧固化剂的国内外发展概况、制备方法及发展趋势,其中包括水性聚氨酯改性、有机硅改性及无机纳米粒子改性水性固化剂和含磷水性固化剂。     

超支化聚合物改性环氧树脂的研究进展

超支化聚合物因其独特的结构和性能特点,已在众多领域得到了广泛的应用,尤其是在热固性树脂的改性中的应用,可作为热固性树脂的增韧剂。该文介绍了环氧树脂的性能特点及应用,超支化聚合物的结构及特点,着重论述了近年来超支化聚合物在改性环氧树脂力学性能、固化行为及热性能方面的研究进展,并指出了超支化聚合物在环氧树脂和其它热固性树脂改性方面的发展方向。     

Synthesis and characterization of petroleum and biobased epoxy resins: a review

Petroleum based epoxy resins exhibit various excellent properties such as adhesion, mechanical performance, electrical insulation and chemical resistance. There is wide concern towards depletion of non‐renewable resources, climate change and finding renewable alternatives for petroleum based materials to reduce the emission of greenhouse gases. This review mainly draws attention towards the utilization of renewable resource based epoxy resin derived from lignocellulosic biomass, furan, tannins, itaconic acid, rosin acid and bio‐oil etc. Without altering the mechanical and thermal properties much, epoxy resins derived from renewable materials have been widely investigated. The last two decades have witnessed an exponential growth in using bio‐derived products, which has been driven by the need to replace petroleum based materials, reduce fuel consumption and lower the overall environmental impact. © 2018 Society of Chemical Industry     

环氧树脂材料功能改性研究进展

概述了环氧树脂材料在韧性、吸波性和阻燃性等方面的改性原理及研究现状,并对其未来发展进行了展望。     

环氧树脂化学改性有机硅树脂的方法综述

环氧改性有机硅树脂可提高有机硅树脂的力学性能和粘接性能,还可降低有机硅树脂的固化温度.归纳总结了环氧树脂化学改性有机硅树脂的4种反应类型:1)缩聚反应;2)环氧基的开环聚合反应;3)硅氢加成反应;4)引入环氧基的反应.对该领域的近期研究成果进行了简要的综述,并展望了该领域未来的发展方向.     

环氧树脂改性研究进展

综述了近年来国内外环氧树脂的改性机理和方法,包括结构改性、橡胶改性、树脂改性、有机硅改性、膨胀单体改性和无机填料改性等。     

Mechanical properties of epoxy resin modified with polycarbonate and reactive polybutadiene

Epoxy resin Epidian 5 cured with triethylene tetramine was modified with hydroxyl‐terminated polybutadiene (PB) and polycarbonate (PC). Compositions with different amount of modifiers were obtained and tested for their impact strength, flexural strength, as well as resistance to crack propagation. The latter was assessed by evaluating the critical stress intensity factor under three‐point bending mode using single‐edge notched specimens. Scanning electron microscopy was used to analyze the fractured sample surfaces. The obtained results revealed that the mechanical properties of epoxy resin were improved due to the formation of heterogeneous phase with rubber particles, which arrest the propagation of cracks. Moreover, synergism effect was observed with the hybrid composition containing 10% PC and 2.5% of reactive PB. The impact strength was higher by ～ 15% than the sum of impact strength of compositions containing only one modifier. Another hybrid composition with 2.5% PB and 2.5% PC also exhibited synergism effect with the flexural strain at break, the energy at break under flexure, as well as the brittle fracture energy estimated from the critical stress intensity factor measurements. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

环氧树脂的改性研究进展及发展趋势

重点对环氧树脂的几种改性结构的研究进展进行了综述,并分析了不同改性结构的利与弊。最后对环氧树脂的未来研究方向和发展趋势进行了展望。     

纳米材料改性环氧树脂的研究进展

综述了国内外纳米材料改性环氧树脂(EP的研究现状。介绍了不同纳米材料对EP复合材料力学性能、热性能、电磁性能等的影响。重点介绍了碳纳米管和无机纳米粒子如蒙脱土、TiO2、SiO2、Al2O2等对EP的改性。探讨了纳米材料在改性EP时存在的问题,并对纳米材料改性EP的趋势作出展望。     

Study on epoxy resins modified by polycarbonate polyurethanes

In this article, the structure and properties of the epoxy resin (EP) modified by polyurethane (PU) prepolymers were studied. The three types of polyurethane prepolymers, namely, polycarbonate-type PU (TPC), polyether-type PU, and polycarbonate–polyether-type PU were employed. The samples were analyzed by means of an infrared spectrometer, a differential scanning calorimeter, a scanning electron microscope, a transmission electron microscope, a scanning tunnel microscope, and a thermal gravimeter. The results show that the EP modified by TPC is of excellent thermal resistance and mechanical properties. Specifically, when the ratio of PU to EP is 10/100 (wt/wt), optimal properties are achieved. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 887–893, 1998     

纳米SiO_2对酚醛环氧树脂改性研究

以双酚A及甲醛为基本原料,加入纳米SiO2制备了纳米氧化硅改性酚醛树脂预聚体,其与环氧树脂继续共聚得到纳米氧化硅改性酚醛环氧树脂。通过红外光谱、粒径分布仪、X射线衍射、扫描电镜分析及涂膜性能测试对产物进行了研究和表征。结果表明,纳米氧化硅均匀分布在共聚物中,说明纳米氧化硅中的羟基参与了酚醛的共聚;纳米SiO2的加入对酚醛环氧树脂的结构无太大影响。与未改性醛醛环氧树脂比较,纳米SiO2的加入可有效提高涂层的耐水煮、黄变、硬度、吸水率及耐盐水腐蚀性。     

环氧树脂水性化研究进展

系统地介绍了环氧树脂水性化的方法及其特点,包括机械法、相反转法和化学改性法。总结了目前国内外环氧树脂水性化体系的研究进展。