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COPNA树脂的合成及其复合材料耐热性研究 总被引:1,自引:0,他引:1
以三种不同的油浆为原料 ,在酸性催化剂存在下 ,与对苯二甲醇反应 ,得到三种缩合多环多核芳烃 (COPNA)树脂。以COPNA树脂、酚醛、环氧树脂为基体 ,与碳纤维复合 ,通过模压成型 ,得到三种不同基体的复合材料。比较考察了COPNA树脂的软化点、残炭、β树脂含量等粘结性参数以及树脂 /碳纤维复合材料的耐热性能。经分析认为 ,得到的COPNA树脂可达到工业粘结剂的要求 ,具有很好的粘结作用 ;以COPNA树脂为基体的碳纤维复合材料 ,表现出很好的耐热性 ,这为COPNA树脂的应用提供了一个很好的方向。 相似文献
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首次以煤沥青为单体,二乙烯基苯为交联剂,在对甲苯磺酸的催化作用下合成了缩合多核芳烃(COPN)树脂,采用傅立叶红外分析(FT-IR)和核磁共振氢谱(1H-NMR)研究其反应机理;采用扫描电镜(SEM)对反应过程中生成的中间相小球的尺寸变化分析COPNA树脂的生成情况,采用热重(TGA)研究COPNA树脂的热稳定性,研究表明,该反应为阳离子型聚合反应,所获得的COPNA树脂具有较高的耐热性,在氮气中的热降解起始温度为410℃。 相似文献
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烯丙基COPNA树脂的合成与性能 总被引:4,自引:0,他引:4
以1-萘酚、对苯二甲醇、烯丙基氯等合成出新型缩合多核芳烃(COPNA)树脂。采用FT-IR和1H-NMR研究了COPNA树脂的化学结构;通过凝胶分析研究了COPNA与双马来亚酰胺的共聚反应性;采用TG-DTG研究了这种共聚树脂的热稳定性。研究表明,COPNA树脂结构中含有烯丙基活性基团,可与BMI发生共聚反应制备耐热性优良的树脂体系。 相似文献
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以橡胶填充油为初始原料,经减压蒸馏和热处理等预处理后,在对甲基苯磺酸催化下,与三聚甲醛反应合成COPNA树脂,合成的COPNA树脂残炭率达到52.96%,软化点为109℃,β树脂含量为17.71%。分别以COPNA树脂、酚醛树脂和环氧树脂为粘结剂制备碳刷,并对其性能进行测试。研究发现以COPNA树脂为粘结剂制备的碳刷具有耐高温、抗折强度高、硬度大等优点。 相似文献
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炭素前驱体—缩合多环多核香芳烃 COPNA 树脂及其应用 总被引:2,自引:0,他引:2
一、引言炭素材料是现代工业的一种主要原材料,广泛用于冶金、机械、机电等行业。按日本炭素界权威大谷杉郎教授的观点,炭素材料制品的发展史可以划分为三个阶段。第一代产品是木炭、焦炭等天然物质的加工品,利用其所含的碳的化学还原性,用作铁矿石等的还原剂。19世纪随着电气工业的发展,出现了对耐腐蚀电极、耐高温导电材料、耐磨及滑动性好的电刷等电气材料的需求,开始用焦炭和煤焦油混合成型、高温焙烧制取炭素材料,这是第二代产品。电孤炉用的人造石墨电极是这种第二代炭素制品的典型代表。 相似文献
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以石油沥青为单体的COPNA树脂的合成及其机理 总被引:6,自引:0,他引:6
从综合利用重质油出发,以石油沥青为单体。对苯二甲醛(TPA)为交联剂在浓硫酸或对甲苯磺酸催化下合成了TPA系缩合多环多核芳香烃树脂(COPNA树脂),以此开辟出一条制备COPNA树脂的新方法。研究中采用热解重量分析法(TGA),考察了COPNA树脂的固化反应和热稳定性。结果表明,该沥青在氮气中的热起始降解温度在420℃~430℃之间。最后,利用反应物和产物的红外图谱(IR)探讨了COPNA树脂合成反应机理。谈机理是在酸催化下,多环芳烃与交联剂发生亲电取代反应。 相似文献
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Some properties of a condensed polynuclear aromatic resin (COPNA) as a binder for carbon fibre composites 总被引:2,自引:0,他引:2
A new thermosetting resin consisting of condensed aromatic nuclei cross-linked with methylene bridges was prepared from a mixture of pyrene, phenanthrene and 1,4-benzenedimethanol by heating above 393 K. This resin, named COPNA, adheres well to carbon fibres, and the carbon fibre/resin composite (CFRP) prepared by using this resin as a binder exhibits no remarkable changes in mechanical properties after heating at 523 K for 10 h and 573 K for 2h. The CFRP specimens were converted into carbon fibre/carbon composite (CFRC) by further heating up to 1 273 K without any trouble. 相似文献
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K. W. M. Davy 《Journal of materials science. Materials in medicine》1994,5(6-7):350-352
The preparation of a novel class of dimethacrylate esters, by the reaction of glycidyl methacrylate with various phthalic acid isomers and their halogen substituted derivatives is described: These monomers exhibited low viscosity, possessed similar physical and mechanical properties to bis GMA, and the presence of halogen introduced X-ray opacity into the polymer giving opacity similar to tooth enamel. 相似文献
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The treatment of an aqueous solution of four polycyclic aromatic hydrocarbons, namely acenaphthene, phenanthrene, anthracene and fluoranthene, under moderate conditions of temperature and pressure has been conducted in the presence and absence of free radical promoters (hydrogen peroxide or potassium monopersulfate). With no addition of promoters, the process achieves PAH conversion values in the range 80-100% at 190 degrees C and 50 bars of air pressure (80 min of reaction). Similar results are obtained in the presence of hydrogen peroxide, however, in this case, the time required is just 60 min with a sharp decrease in PAH concentration in the first 10-20 min. Additionally, temperature can be lowered to values in the range 100-150 degrees C. If potassium monopersulfate is used instead of hydrogen peroxide, an analogous behaviour is experienced, in the latter case, temperatures above 120 degrees C lead to an inhibition of anthracene oxidation, likely due to ineffective decomposition of the monopersulfate molecule. 相似文献
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Composite materials have increasing success in engineering application. To extend their usage to higher temperatures, specially
adapted polymer resins must be used. Polyimide (PI) and polyethersulphone (PES) are among the candidate materials for service
at high temperatures. The mechanical behaviour of the PI and PES matrix systems under different temperatures, the resulting
properties and the damage and failure, under static as well as fatigue loading, are investigated in the present study together
with unidirectional laminates of aligned short fibres in the 0° or 90° direction. The room-temperature results are compared
to a conventional epoxy resin. 相似文献