共查询到19条相似文献,搜索用时 93 毫秒
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用IR、DSC等分析方法研究了端2-噁唑啉聚环氧丙烷(活性聚醚)与环氧树脂的固化反应,对固化机理作了讨论。并考察了不同分子量活性聚醚对环氧树脂的增韧作用。结果表明,此活性聚醚对环氧树脂增韧效果明显,固化树脂综合性能较好。 相似文献
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工业中大量生产的端羟基聚醚 ,由于羟基的反应活性不够 ,不能直接用于增韧胺类固化的环氧树脂 .Bu2 SnO Bu3PO4 缩合物能催化羟基对环氧基的加成反应 .本文研究在Bu2 SnO Bu3PO4 缩合物Sn P6 70 0的存在下以端羟基聚四氢呋喃 (PTMG)增韧芳香胺 4,4′ 二氨基二苯砜 (DDS)固化的环氧树脂 .PTMG首先与环氧树脂反应生成嵌段共聚物 ,在固化时发生微相分离 .分散相的尺寸在有利于增韧的范围内 .PTMG在分子量与浓度适当时 ,能使树脂的断裂韧性大大提高 ;抗弯强度也有显著提高 ,而Tg 和模量略有降低 . 相似文献
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热塑性聚醚酰亚胺改性四官能度环氧树脂的相分离研究──固化剂用量的影响 总被引:3,自引:0,他引:3
以DSC、TRLS和SEM等方法研究了固化剂DDS用量对苯端基聚醚酰亚胺(P-PEI)改性4,4'-二氨基二苯甲烷四缩水甘油环氧树脂(TGDDM)体系的固化速率及相结构的影响.结果表明,20phrP-PEI改性环氧体系在150℃固化时,随DDS量增加,固化反应速率增大,相分离时间提前,形成了不同的相结构,解释了DDS量对粘接剪切强度的影响. 相似文献
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温度效应对氟链封端聚醚酰亚胺改性环氧树脂相分离的影响 总被引:5,自引:0,他引:5
用差示扫描量热仪(DSC)、扫描电镜(SEM)和时间分辨光散射(TRLS)比较了全氟碳链封端和苯环封端聚醚酰亚胺改性环氧树脂在不同温度下的相分离.结果表明,与P-blend相比,F-blend的固化速度和相分离速度较慢,诱导期和相结构固定时间推迟,相间距较小.升高温度,相间距因相分离速度加快而增大,同时由于全氟碳链端基引起的差异减小.因此,通过改变固化温度和聚醚酰亚胺的端基来降低聚醚酰亚胺的表面能,可以在一定程度上调控反应诱导相分离体系的相结构,并获得相间距较小的双连续结构. 相似文献
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本文在加热下环氧树脂(Polyethylene Glycol, EP)开环与端羧基丁腈橡胶(carboxyl-terminated Butadiene acrylonitrile, CTBN)与发生酯化反应生成预聚物,然后选用单一固化剂聚醚胺(Polyetheramine, D400)和混合固化剂聚乙二醇(Polyethylene Glycol, PEG,Mn=2000)与二乙基甲苯二胺(Diethyltoluene diamine, DETDA)作用下固化及粘接木块。重点探讨CTBN、EP、D400和PEG与DETDA各组成的用量对环氧树脂基粘胶性能的影响,并通过红外判定主要官能团反应,重点探讨胶粘固化物的润湿性、吸水性、拉伸强度和热重手段评价其环氧树脂粘胶性能。结果表明随着CTBN用量的增加,增韧环氧树脂的固化效果越来越好,但是增加到一定程度,有副反应的作用导致其固化效果与粘性都会逐渐降低。结论:对固化物进行表征综合评价,CTBN、EP和固化剂的质量比为1∶5∶2时,其粘性最强,韧性最高,进一步研究有望获得市场欢迎的产品。 相似文献
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热塑性聚醚酰亚胺改性四官能度环氧树脂的相分离研究:Ⅳ.聚醚 … 总被引:9,自引:0,他引:9
研究了不同用量新型苯端基聚醚酰亚胺对其改性4,4,‘-二氨基二苯甲烷四缩水甘油醚环氧树脂9TGDDM)/4,4’-二氨基二苯砜体系的固化速度及相结构的影响。结果表明,随着PEI用量的增加,固化反应速度增大,形成了不同的相结构。解释了PEI用量对粘接剪切强度的影响。 相似文献
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丙烯酸酯封端环氧丙烷聚醚聚氨酯与双酚A型环氧树脂共混固化体系 总被引:1,自引:0,他引:1
丙烯酸酯封端环氧丙烷聚醚聚氨酯与双酚A型环氧树脂共混固化体系丁伦汉华道本黄家贤*韩敏(南开大学化学系天津300071)(天津市聚氨酯泡沫材料厂天津)关键词环氧树脂,聚环氧丙烷,共混物,制备1996-11-22收稿,1997-05-13修回国家自然科学... 相似文献
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Carboxyl terminated polyethers, the adducts of hydroxyl terminated polytetrahydrofuran and maleic anhydride, were used as toughener for epoxy resins. The morphology of the toughened resins was investigated by means of turbidity measurement, dynamic mechanical testing and scanning electron microscope observation. It turned out that the molecular weight and the carboxyl content of the polyether and the cure conditions are important factors, which affect the particle size of the polyether-rich domains and, in turn, the mechanical properties of the cured resin. Carboxyl terminated polytetrahydrofurans have a low glass transition temperature, and in appropriate amount they do not affect the thermal resistance of the resin. These advantages make them preferable as toughener for epoxy resins. 相似文献
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A novet toughened epoxy resin was obtained by using aprecopotymer of epoxy resin and hydroxy-terminated butadiene-acrylonitrilecopolymer(HTBN)and amine curing agent.The cured toughened resin hasexcellent mechanical properties due to the two-phase structure,which has beenobserved from SEM and TEM. 相似文献
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聚丙撑碳酸酯增韧环氧树脂的研究 总被引:6,自引:0,他引:6
研究了聚丙撑碳酸酯(PPC)对环氧树脂(EP)的改性作用、加入20~30Phr的PPC,环氧树脂力学性能可以大幅度提高,粘接剪切强度为1233MPa,冲击强度为16.78kJ/m2;而纯环氧树脂固化物,其剪切强度为9.36MPa,冲击强度为9.99kJ/m2。SEM和DSC观测表明PPC/EP体系呈两相结构。 相似文献
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S. Premkumar 《European Polymer Journal》2008,44(8):2599-2607
Diglycidyl ether of bisphenol A epoxy resin (DGEBA, LY 556) was toughened with 5%, 10% and 15% (by wt) of caprolactam blocked methylenediphenyl diisocyanate (CMDI) using 4,4′-diaminodiphenylmethane (DDM) as curing agent. The toughened epoxy resin was further modified with chemical modifier N,N′-bismaleimido-4,4′-diphenylmethane (BMI). Caprolactam blocked methylenediphenyl diisocyanate was synthesized by the reaction of caprolactam with methylenediphenyl diisocyanate in presence of carbon tetrachloride under nitrogen atmosphere. Thermal properties of the developed matrices were characterized by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), heat distortion temperature (HDT) and dynamic mechanical analysis (DMA). Mechanical properties like tensile strength, flexural strength and impact strength were tested as per ASTM standards. The glass transition temperature (Tg) and thermal stability were decreased with increase in the percentage incorporation of CMDI. The thermomechanical properties of caprolactam blocked methylenediphenyl diisocyanate toughened epoxy resin were increased by increasing the percentage incorporation of bismaleimide. The values of impact strength for epoxy resin were increased with increase in the percentage concentration of CMDI. The homogeneous morphology of CMDI toughened epoxy resin and bismaleimide modified CMDI toughened epoxy resin system were ascertained from scanning electron microscope (SEM). 相似文献
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Gang Li Zhibin Huang Peng Li Chunling Xin Xiaolong Jia Binghui Wang Yadong He Seungkon Ryu Xiaoping Yang 《Thermochimica Acta》2010,497(1-2):27-34
Curing kinetics and mechanisms of polysulfone nanofibrous membranes toughened TGDDM/DDS were investigated by using isothermal DSC and NIR, and compared to those of TGDDM/DDS and PSF films toughened TGDDM/DDS. At early curing stage, the curing rate of nanofibrous membranes toughened system was faster than those of other two systems, whereas the final conversion of toughened systems was lower than that of resin matrix. Most of the primary amine was consumed by gelation and the concentration of secondary amine reached the maximum around gelation. The faster consuming rates of primary and secondary amines in nanofibrous membranes toughened system resulted in higher concentration of hydroxyl groups and tertiary amines at gelation, which led to larger amounts of branching and crosslinking compared to resin matrix. The comparison of the results obtained from two methods showed that the epoxide conversion exhibited identical variations as a function of time, as well as the curing rate. 相似文献
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HUANG Fan LIU Yiqun ZHANG Xiaohong GAO Jianming SONG Zhihai TANG Banghui WEI Genshuan & QIAO Jinliang . SINOPEC Beijing Research Institute of Chemical Industry Beijing China . Institute of Applied Chemistry College of Chemistry Molecular Engineering Peking University Beijing China Correspondence should be addressed to Qiao Jinliang 《中国科学B辑(英文版)》2005,48(2):148-155
Epoxy resin has been widely used as structuralmaterials and adhesives in electronics, aerospace in-dustries and etc. for its impressive overall properties.However, epoxy network is brittle and notch sensitive,which restricts its application scope. As a re… 相似文献
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相对于传统聚醚螯合树脂,侧链液晶聚醚型螯合树脂由于刚性介晶基元的引入,赋于了聚醚分子更好的使用性能,具有热稳定性好、吸附容量大、离子选择性高、易于设计与合成等优势,成为近年来树脂领域研究的热点之一。本文介绍了近年来国内外侧链液晶聚醚螯合树脂的合成、性能与应用现状。最后依据对侧链液晶聚醚螯合树脂机械性能、吸附选择性、再生性能以及环保性能的使用要求,对其分子设计与合成方法及新应用领域进行了展望。 相似文献
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Yue Situ Jianfeng Hu Hong Huang Heqing Fu Hanwei Zeng Huanqin Chen 《Frontiers of Chemistry in China》2008,3(2):235-241
A novel epoxidized soybean oil (ESO) internally toughened phenolic resin(ESO-IT-PR) with both good toughness and excellent
thermal stability was prepared as the matrix resin of copper clad laminate (CCL). FTIR was adopted to investigate the molecular
structure of modified phenolic resins and SEM was used to observe the micro morphology of their impacted intersections. The
properties of CCLs prepared with these modified phenolic resins were studied to determine the optimal process and investigate
the toughening mechanism. The main modifying mechanism is the etherification reaction between phenol hydroxyl and ESO catalyzed
by triethanolamine and the chain extension polymerization between ESO and multi-amine gives the long-chain ESO epoxy grafting
on the phenolic resin prepolymer. when the ESO content is 30% and the curing agent content is 7%, the ESO toughened phenolic
resin possesses optimal performance. The flexible ESO epoxy shows significant toughening effect and it crosslinks with the
phenolic resin to form an internally toughened network, which is the key factor for improving the solderleaching resistance
of CCL prepared with this modified phenolic resin.
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Translated from Journal of South China University of Technology (Natural Science Edition), 2007, 35(7): 99–104 [译自: 华南理工大学学报(自然科学版)] 相似文献