排序方式: 共有13条查询结果,搜索用时 31 毫秒
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脂肪醇聚氧乙烯醚甲基丙烯酸酯的制备及表征 总被引:2,自引:1,他引:1
以脂肪醇聚氧乙烯醚(AEO)和甲基丙烯酸丁酯(BMA)为原料,通过共沸分馏酯交换工艺合成了脂肪醇聚氧乙烯醚甲基丙烯酸酯(AEOMA)。通过在反应体系中引入共沸剂甲苯提高了酯交换反应的速率。确定了酯交换反应的最佳工艺条件:AEO用量0.10mol、n(BMA)∶n(AEO)=11、阻聚剂Z-701用量(占BMA的质量分数)0.30%、催化剂Ca2用量(占BMA的质量分数)2.0%、甲苯用量1.2mol、反应时间9h。在此条件下,AEO的转化率为97.0%。采用油水混合萃取分离工艺,提高了产品分离效率和产品纯度,使AEOMA的收率达95.0%,纯度达97.0%。红外光谱表征结果表明,AEO分子中的羟基全部转化为酯键,并在分子中引入了双键,生成了AEOMA。 相似文献
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Polyacrylonitrile (PAN), a well-known polymer with good stability and mechanical properties, has been widely used in producing carbon nanofibers (CNFs) as these have attracted much recent attention due to their excellent characteristics, such as spinnability, environmentally benign nature and commercial viability. Among the various precursors to produce CNFs, PAN has been extensively studied due to its high carbon yield and flexibility for tailoring the structure of the final CNFs as well as the ease of obtaining stabilized products due to the formation of a ladder structure via nitrile polymerization. In view of this, they have applications in areas such as electronics, tissue engineering, membrane filtration and high performance composites. This review presents various combinations of PAN and PAN-based precursors in producing CNFs from the PAN homopolymer or its modified precursors, copolymers, blends and various composites. Various modifications of PAN and their future prospects in different scientific and technological disciplines are addressed. 相似文献
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关于脂肪醇聚氧乙烯醚生产过程控制的理论依据和经验总结 总被引:1,自引:0,他引:1
从聚氧乙烯醚类的聚合反应机理入手,对环氧乙烷的阴离子型聚合反应动力学方程进行了分析和探讨,从而建立了此类反应的数学模型。为生产控制过程提供了理论依据。对工业生产具有很好的指导意义。 相似文献
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以柠檬酸、壬基酚聚氧乙烯醚和二乙醇胺为原料合成了一种具有防锈、润滑双重功能的水基合成切削液添加剂———柠檬酸壬基酚聚氧乙烯醚单酯二乙醇酰胺。柠檬酸酐的制备条件为柠檬酸∶乙酸酐(摩尔比)为1.0∶1.2,温度为35℃,反应时间为18h;酯化摩尔比(酸酐∶OP)为1.0∶1.2,温度为80~90℃,反应时间为3h;酰胺化条件为柠檬酸壬基酚聚氧乙烯醚单酯∶二乙醇胺(摩尔比)为1∶1.5,反应温度为130~140℃,反应时间为3~4h。采用红外光谱法对产物进行表征,进而确定了合成的最佳工艺路线和工艺条件。 相似文献
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