共查询到20条相似文献,搜索用时 109 毫秒
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以双环戊二烯等为原料合成一种新型三官能团液体脂环族环氧树脂. 通过红外光谱、 核磁共振氢谱及质谱等对其中间体及环氧树脂的结构进行了表征. 所得脂环族环氧树脂采用阳离子引发 剂二甲苯基碘鎓六氟磷酸盐引发进行紫外光固化, 对其光固化活性进行了研究, 同时讨论了氧化剂过氧化苯甲酰对该光固化体系的增感作用. 研究结果表明, 新合成的脂环族环氧树脂采用二甲苯基碘鎓六氟磷酸盐引发可以进行光固化, 过氧化苯甲酰明显地加快了其光固化速度, 固化膜具有较好的热稳定性. 相似文献
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有机硅改性环氧树脂的合成与性能研究 总被引:11,自引:0,他引:11
用氨基硅油和双酚A型环氧树脂为原料合成一种新型的环氧树脂。研究了不同反应时间、不同反应温度以及不同氨基硅油含量对改性环氧树脂性能的影响,用热重法对改性树脂的耐热性进行了表征。结果表明,用工业产的氨基硅油合成的改性环氧树脂同样具有良好的韧性和耐热性。 相似文献
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以松节油为原料合成出新型TEG - 99环氧树脂 ,研究了它分别与典型胺类、聚酰胺类及酸酐类固化剂的固化反应和固化产物的性能。结果表明 ,以松节油为原料合成TEG - 99环氧树脂的过程简单、稳定 ,产物具有与双酚A型环氧树脂相似的外观、理化性能、固化特征等 ,是松节油综合利用的一个有前景的途径 相似文献
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环氧树脂-玻璃微珠多孔复合材料的水声性能 总被引:2,自引:1,他引:1
为提高薄板吸声材料的吸声性能,用改性环氧树脂和空心玻璃微珠等原料合成了25mm厚环氧树脂-玻璃微珠多孔复合材料,在脉冲声管中测试了合成材料试样的声压反射系数和吸声系数,研究了合成工艺参数对其水下声学性能的影响.测试结果表明:环氧树脂-玻璃微珠多孔复合材料是一种良好的水下吸声材料,其吸声性能受到空心玻璃微珠的种类及其含量和固化剂种类等参数的影响.制备了填充多种空心玻璃微珠低频吸声性能良好的环氧树脂-玻璃微珠声学材料.合理地设计实验工艺参数,可以得到水下声学性能更佳的环氧树脂-玻璃微珠多孔复合材料. 相似文献
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紫外光固化脂环族环氧丙烯酸酯涂料的制备及性能 总被引:2,自引:0,他引:2
通过丙烯酸(AA)与脂环族环氧树脂的开环反应合成了可紫外光(UV)固化的脂环族环氧丙烯酸酯树脂(CEA)。采用红外光谱(FT-IR)对树脂结构进行了表征,研究了反应温度、反应时间对产率的影响。用活性稀释剂与CEA制备了涂料预聚物,用转板黏度计测定了预聚物的黏度,采用差示扫描量热(DSC)仪、综合热分析仪和铅笔硬度计对树脂固化膜进行了分析。结果表明:当丙烯酸与环氧基团摩尔比为1.03,120°C下反应25.8 h时,反应转化率可达96.58%。CEA固化膜的玻璃化转变温度为64°C,初始分解温度为314°C,活性稀释剂的加入增强了固化膜的耐热性,固化膜铅笔硬度可达6H。 相似文献
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On the Chemical Processes Accompanying Silver Reduction from Solutions of Its Salts in Organic Media
I. N. Senchikhin E. S. Zhavoronok O. Ya. Uryupina A. V. Shabatin R. R. Khasanova E. S. Belyaev V. I. Roldughin 《Colloid Journal》2018,80(5):550-555
Silver reduction from its nitrate has been studied in the media of DGEBA-based and aliphatic epoxy resins. It has been found that, under the experimental conditions that were employed, silver ions can be reduced without chemical interaction with the medium only due to photochemical processes. The reduction rate is determined by the rate of dissolution of the initial silver salt in an organic medium and the possibility of the formation of solvates by the system components. Refractometry has been proposed for use in monitoring the kinetics of silver nitrate dissolution in epoxy resins and the formation of silver nanoparticles. Stable dispersions of silver nanoparticles in epoxy resins have been obtained. 相似文献
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P. M. Thangamathesvaran Sampat R. Jain 《Journal of polymer science. Part A, Polymer chemistry》1991,29(2):261-267
Novel epoxy resins of various thiocarbonohydrazones have been synthesized by reacting the aldehyde or ketone derivatives of thiocarbohydrazide with excess of epichlorohydrin. The resins have been characterized by elemental analyses, epoxy equivalents, 1H-NMR and IR spectra, thermal analyses, and viscosity measurements. Curing of the resins has been carried out by mixing with thiocarbohydrazide or ethylenediamine and heating at 80°C for 48 h. A comparison of the thermal stability of the cured resin samples has been made. 相似文献
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咪唑固化不同类型环氧树脂的固化特征、固化动力学及其反应活性 总被引:2,自引:0,他引:2
以咪唑为固化剂,对缩水甘油醚型、缩水甘油酯型环氧树脂(简称链型环氧树脂)及脂环环氧树脂的固化特征、固化动力学及反应活性进行了研究.DSC实验结果表明,固化过程均分两阶段进行,链型环氧树脂固化反应表观活化能低于脂环环氧树脂.各树脂第一阶段的表观反应活化能均低于第二阶段活化能.当脂环环氧树脂中混入不同比例的链型环氧树脂后,固化反应速率均较脂环环氧树脂单独固化时快,当链型环氧树脂量大于50%时,更为明显. 相似文献
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Biomass has received considerable attention because it is renewable and offers the prospect of circulation of carbon in the ecological system. The concept “Biorefinery” has been developed rapidly in order to establish sustainable industries. Recently, new types of epoxy resins with polyester chains, which can be derived from saccharides, lignin and glycerol, have been investigated. In the above studies, the relationship between chemical structure and physical properties was investigated. In the present review, the features of the preparation system and the action of biomass components in epoxy resin polymer networks are described. The glass transition temperatures of the epoxy resins increased with increasing content of biomass components in epoxy resin polymer networks. Thermal decomposition temperatures were almost constant regardless of the content of biomass components contents in epoxy resins. Mass residue at 500 °C increased with increasing contents of biomass components in epoxy resins. It was found that the thermal properties can be controlled by changing the contents of biomass components. 相似文献
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Abstract This review covers the literature in the field of chromatographic analysis of epoxy resins and epoxy resin formulations from about 1970 to the present. Although exhaustive reviews of general chromatographic techniques have recently been published [1–9], and size exclusion chromatography has received additional coverage in journals and monographs on polymers [5–7], no reviews specifically devoted to the application of chromatographic techniques to epoxy resins have appeared. 相似文献
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Imidazole‐type thermal latent curing agents with high miscibility for one‐component epoxy thermosetting resins 下载免费PDF全文
Kenji Kudo Sawako Fuse Masahiro Furutani Koji Arimitsu 《Journal of polymer science. Part A, Polymer chemistry》2016,54(17):2680-2688
Epoxy resins are important thermosetting resins widely employed in industrial fields. Although the epoxy–imidazole curing system has attracted attention because of its reactivity, solidification of a liquid epoxy resin containing imidazoles proceeds gradually even at room temperature. This makes it difficult to use them for one‐component epoxy resin materials. Though powder‐type latent curing agents have been used for one‐component epoxy resin materials, they are difficult to apply for fabrication of fine industrial products due to their poor miscibility. To overcome this situation and to improve the shelf life of epoxy–imidazole compositions, we have developed a liquid‐type thermal latent curing agent 1 , generating an imidazole with a thermal trigger via a retro‐Michael addition reaction. The latent curing agent 1 has superior miscibility toward epoxy resins; in addition, it was confirmed that the epoxy resin composition has both high reactivity at 150 °C, and long‐term storage stability at room temperature. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 2680–2688 相似文献
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C. Carfagna E. Amendola M. Giamberini A. G. Filippov R. S. Bauer 《Liquid crystals》1993,13(4):571-584
By endcapping mesogenic rigid rod molecules with reactive epoxy groups a novel class of liquid-crystalline thermoset has been obtained. In fact is has been shown that the nematic molecular arrangement is sustained over the crosslinking reaction of liquid-crystalline epoxy resins when the curing reaction is carried out in the thermal stability range of the liquid-crystalline phase. Calorimetric analysis was used in characterizing the isothermal cure. An unsophisticated model is proposed for evaluating the activation energies of the crosslinking reaction. For liquid-crystalline epoxy resins lower activation energies result with respect to the cure reactions for non liquid-crystalline epoxy resins. 相似文献
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Chong Cheng Jun Wang Shuang Yang Jingsheng Wang Xi Chen Yue Jia Qiufei Chen Pengzong Guo Xiao Wang Fu Liu 《先进技术聚合物》2022,33(1):260-269
Thermoplastic resins have been widely used in fiber reinforced polymer composites because of its recyclability and short cycle times. However, the high viscosity after heating and melting restricts its infiltration on the surface of fiber. In this study, a series of thermoplastic epoxy resins were prepared via the chain extension reaction of epoxy groups with liquid aniline using triphenylphosphine (TPP) as catalyst. The relationship between polymer network structure and performance was comprehensively investigated. The solubility tests indicated that excessive aniline or TPP facilitated the crosslinking of resins. Besides, on the premise of thermoplasticity, appropriate TPP could increase the degree of chain extension, molecular weight, and glass transition temperature of resins. Furthermore, the in-situ polymerization process facilitated infiltration between epoxy resin and the fibers before chain extension reaction. The bending test showed that the flexural performance of the sample with 2 phr of TPP was improved by 38.8%. Therefore, this work provides a feasible method to prepare the thermoplastic epoxy resins and its fiber-reinforced composites with good mechanical properties. 相似文献
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A simple optical method for quantitative comparison of the effectiveness of epoxy cure accelerators, used for speeding up the crosslinking process of epoxy resins with cyclic anhydrides, is described. Fluorescent molecular probes and a miniature fiber optic spectrometer have been applied for measurement of the cure kinetics of a model epoxy resin/anhydride composition in the presence of various cure accelerators. A quantitative index of accelerator performance has been determined for several of the most common accelerators. 相似文献