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采用非等温DSC法对低黏度体系CY184/IPDA环氧树脂体系及对CY184/ES184/IPDA环氧/环硫树脂体系的固化反应动力学进行了研究。用高级等转化率Vyazovkin积分法求取活化能Ea,通过Málek法确定了固化反应机理函数和动力学参数,得到固化反应动力学方程。结果表明:CY184/IPDA环氧树脂体系的平均活化能为47.04 kJ·mol-1;CY184/ES184/IPDA环氧/环硫树脂体系的活化能为48.97 kJ·mol-1。两种体系的模型拟合曲线与实验得到的DSC曲线吻合得较好,均符合esták-Berggren(m,n)模型。 相似文献
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采用双酚A型E-51环氧树脂与硫脲为原料,制备了环氧-环硫树脂(EP-ES)。通过IR分析确定合成产物结构中有环硫基团存在。对合成产物固化过程的DSC测试,表明环氧-环硫树脂具有比环氧树脂更低的固化温度及更少的固化反应热。并通过超声分散和溶液共混法制备了环氧-环硫树脂/有机化凹凸棒土(EP-ES/OAT)复合材料,对该复合材料的形态结构和性能进行力学性能、SEM、DMA和TGA测试。结果表明:与EP-ES树脂相比,EP-ES/OAT复合材料的力学性能、玻璃化温度以及耐热性能均有不同程度的提高。 相似文献
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密封胶用环氧改性丙烯酸树脂生产工艺的研究 总被引:1,自引:0,他引:1
以甲基丙烯酸甲酯为硬单体,丙烯酸丁酯为软单体,丙烯酸为功能单体,环氧树脂为改性剂制备了密封胶用环氧改性丙烯酸树脂。讨论了环氧树脂的类型及用量,溶剂的种类,反应的温度,溶剂和相对分子质量调节剂的选择,确定了适宜于制备密封胶用环氧改性丙烯酸树脂的反应条件及最佳的配方。 相似文献
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以DADGEBA(烯丙基双酚A型环氧树脂)和DADGEBAES(烯丙基双酚A型环氧树脂-环硫树脂)分别作为基体树脂,以T33(酚醛胺类化合物)作为固化剂,制备相应的胶粘剂。采用在线FT-IR(红外光谱)法、DSC(差示扫描量热)法和Arrhenius方程对两种体系固化过程的特征吸收峰、放热焓和表观活化能等进行了表征和分析,并采用计算机软件模拟法计算出两种树脂单聚体的福井函数。研究结果表明:DADGEBAES/T33体系中的环硫基比DADGEBA/T33体系中的环氧基更易反应,前者的固化反应放热焓和表观活化能均小于后者;DADGEBAES中环硫基的福井函数分布多于DADGEBA中环氧基的福井函数分布,说明前者的反应活性更高。 相似文献
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以常用丙烯酸单体为主要原料,加入顺丁烯二酸酐,合成出侧链带有酸酐基团的丙烯酸树脂,再与环氧树脂反应,制得环氧改性丙烯酸树脂。由其制备的单组分环氧改性丙烯酸涂料对玻璃等难附着基材具有优异的附着力。考察了环氧树脂的不同用量对树脂体系相容性及漆膜物理性能的影响,结果表明:环氧树脂用量在15%左右时,改性树脂保留了丙烯酸树脂涂料的优异性能,而且附着力、硬度、光泽得到了提高,丰满度佳。 相似文献
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通过溶液法合成丙烯酸树脂并表征,然后将其添加到环氧树脂中在镁合金表面制备涂层,通过冲击、柔韧性结合电化学阻抗技术(EIS)研究丙烯酸树脂加入对环氧涂层力学及防护性能的影响。研究结果表明,与纯环氧树脂防腐涂层相比,加入丙烯酸树脂后涂层与基体之间的附着力提高了2 MPa、耐冲击性和疏水性均有改善;添加丙烯酸树脂的涂层在浸泡1 656 h后的阻抗为1.25×109Ω·cm2,而环氧清漆涂层的阻抗仅为3.85×107Ω·cm2;因此加入丙烯酸树脂后使环氧涂层有更优异的防腐性能。 相似文献
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环氧丙烯酸双酯树脂的合成与表征 总被引:3,自引:2,他引:3
探讨了季铵盐催化环氧树脂与丙烯酸的酯化反应过程中催化剂、反应温度、反应时间对反应过程的影响 ,对反应产物进行了化学分析和红外光谱表征。结果表明 ,反应过程中环氧基团和羧基基团的消耗速率是相当的 ,适当提高温度有利于酯化反应的进行 相似文献
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We investigated improvement of workability (viscosity), storage stability, and curing ability of thiirane resin for adhesive applications. The viscosity of bisphenol‐F thiirane resin was lower than that of bisphenol‐A thiirane resin, especially at low temperatures, thus improving ease of handling. Addition of diphenyl decyl phosphite improved its storage stability to a level similar to that of bisphenol‐A epoxy resin. The curing of bisphenol‐F thiirane resin increased three times faster by adding 2,4,6‐tris(dimethylaminomethyl)phenol (DMP‐30) as a tertiary amine. In applications of this new thiirane resin as civil and architectural adhesives, a superior curing ability at low temperature was attained. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2953–2957, 2001 相似文献
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Hideaki Kawahara Tokio Goto Kiyoshi Ohnishi Hironao Ogura Hiroyuki Kage Yoshizo Matsuno 《应用聚合物科学杂志》2001,81(1):128-133
Epoxy resin/acrylic composite latexes were prepared by miniemulsion polymerization. Epoxy resins have a functional epoxy group in them and excellent characteristics, such as heat resistance and good adhesion. Acrylic latexes have weather and water resistance. Combining the epoxy resin and the acrylic latex was an attempt to actualize these advantages. The miniemulsion polymerization method was effective in obtaining the composite latex. A less than 500‐nm droplet size for the monomer preemulsion was necessary to obtain the latex in a stable manner. Dimethylaminoethylmethacrylate and methacrylic acid as the reactive functional monomer with an epoxy group were introduced to the latexes. The effect of the polymerization method of these functional groups on the properties of latexes and their films was investigated. The latex prepared by the two‐stage polymerization method had good polymerization stability, storage stability, and solvent resistance. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 128–133, 2001 相似文献
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用酸氧化法对多壁碳纳米管(MWNTs)进行羧化处理后引入酰氯基团,利用酰氯基团与环氧酯聚合物中的羟基进行缩聚反应将MWNTs接枝到环氧树脂结构中,合成得到碳纳米管接枝改性的环氧酯聚合物。该聚合物与丙烯酸单体进行自由基聚合,在聚合物中引入羧基,利用羧基与有机胺中和成盐,制得水性碳纳米管接枝改性环氧酯聚合物。对聚合物进行红外光谱和透射电镜分析表明,碳纳米管与环氧酯聚合物进行了接枝反应。 相似文献
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In this study, a thiirane resin was synthesized by the reaction of corresponding epoxy resin with KSCN. The synthetic conditions influencing the conversion of epoxy group were systematically investigated, such as the reaction temperature, reaction media, reaction time and the ratio of KSCN to epoxy group. It was found that the conversion of epoxy group increased with the increasing reaction temperature, improving the solubility of the mediate, extending reaction time, and the enhancing ratio of salt (KSCN) to epoxy group. Wherein, the reaction temperature and the ratio of the KSCN to epoxy group were more effective. For example, when the molar ratio of KSCN to epoxy group was equal to 2.0, the conversion of epoxy group got the maximum value, 0.65. In addition, the hot plate method was used to measure the gelling time of the resultant thiirane resin at different temperatures. It was found that the gelling time was reduced to 47–85% times as the corresponding epoxy resin depending on the conversion of the epoxy group, and the curing activation energy was diminished from 39 kJ/mol of epoxy resin to 17 kJ/mol. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4023–4027, 2006 相似文献
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以环氧树脂E-20合成了环氧月桂酸酯, 以丙烯酸单体与双丙酮丙烯酰胺(DAAM)对其进行接枝改性, 添加己二酸二酰肼(ADH)制备了常温酮肼自交联纳米环氧树脂乳液。以红外光谱仪表征了合成过程中各步产物及乳液固化后的结构, 结果表明得到了设计结构的树脂, 干燥后涂膜的FTIR谱图表明酮羰基与酰肼基发生交联反应生成了腙;DSC分析表明合成的树脂具有两个玻璃化温度(Tg), 分别为丙烯酸接枝环氧树脂和纯丙烯酸树脂的Tg, 前者低于常温, 表明可以实现常温自交联。在改性环氧树脂乳液的合成过程中, 以粒径分析和综合性能分析对功能性单体配比进行了研究, 结果发现当MAA与E-20质量比为11.0%~14.7%、DAAM的用量为2%~3%、m(ADH)/m(DAAM)为0.8~1.0时, 制得的乳液具有良好的储存稳定性和涂膜性能。透射电镜及粒径测试表明乳液粒径为纳米级, 约88 nm, 且粒径分布均匀, 基本呈稳定的球形结构。将所制备的纳米乳液配制成防腐涂料, 性能测试表明该涂料具有良好的综合性能。 相似文献