共查询到18条相似文献,搜索用时 97 毫秒
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聚醚酮酮和磺化聚醚酮酮的热稳定性研究 总被引:2,自引:0,他引:2
易回阳 《现代塑料加工应用》2000,12(1):4-6
用差热分析法,差示扫描量热法、换失重法,等热分析方法对聚醚酮酮和磺化聚醚酮酮的热稳定及其差异进行了研究,结果表明聚醚酮酮有更好的热稳定性。 相似文献
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亲电聚合法合成甲基取代聚芳醚酮酮的研究 总被引:2,自引:1,他引:1
由间甲基二苯醚(MPE)和对苯二甲酰氯(TPC)、间苯二甲酰氯(IPC)、2,5-二氯对苯二甲酰氯(DCC)等芳二酰氯在1,2-二氯乙烷(DCE)中,以无水AlCl3为催化剂,在N-甲基吡咯烷酮(NMP)存在下,进行亲电缩聚反应,合成了五种不同结构的甲基取代的聚醚酮酮(MePEKK)。用IR、DSC和WAXD等方法对聚合物进行了分析表征,结果表明:聚合物的对数比浓粘度在0.5~0.68dL/g之间,与PEKK相比,MePEKK的结晶度、熔融温度、热分解温度均有所下降,但聚合物仍具有很好的耐热性,其溶解性得到了明显的改善。 相似文献
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综述了含二氮杂萘酮结构的聚芳醚酮和聚芳醚砜的结构性能及其合成、改性、应用研究进展。 相似文献
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以三羟乙基异氰脲酸酯为起始剂,双金属氰化物DMC为催化剂,催化缩水甘油和环氧丙烷(PO)合成超支化聚醚多元醇,并用马来酸酐(MA)对其改性制备不饱和超支化聚醚酯多元醇。讨论了PO与MA的摩尔比对聚合反应的影响,并使用红外光谱和核磁共振图谱对产物结构进行表征。结果表明:适量的聚合单体MA的引入可以提高聚合反应速率,缩短聚合反应时间。当PO与MA的摩尔比为45∶1时,聚合反应时间最短,单体转化率最高。 相似文献
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新型耐高温杂环聚醚砜酮酮材料的研究 总被引:5,自引:0,他引:5
合成一种新型热塑性耐高温杂环聚醚砜酮酮材料(PPESKK),研究了材料的热性能、力学性能、电性能、溶解性能、摩擦性能及膜性能。结果表明,PPESKK为一类具有较高耐热性、综合性能优良、成本低的机械工程塑料。 相似文献
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《分离科学与技术》2012,47(5):899-923
Abstract An investigation of the transport and separation of several permanent gases (CO2, N2, CH4, and H2) and vapors (H2O and ethanol) in unprocessed and rolltruded poly(aryl ether ether ketone) (PEEK) thin films has been conducted to evaluate PEEK for membrane applications requiring thermally and chemically stable materials. Transport coefficients and separation factors have been determined at permeation temperatures ranging from 40 to ca. 180°C. The gas transport coefficients were found to increase by up to 30% depending on the processing conditions. Actual separation factors, determined for a CO2/N2 gas mixture (24.6 vol% CO2), were depressed slightly in comparison to the ideal values obtained from pure component data. In contrast, water and ethanol vapor permeabilities declined between 10 and 15% as a result of processing. For a 39.1 wt% vapor mixture of H2O in EtOH, ideal and actual separation factors, determined at 130°C, were in good agreement. In contrast, order of magnitude improvements in the actual versus ideal separation factors were found for 11.7 and 7.6 wt% mixtures of H2O in EtOH in both unprocessed and rolltruded PEEK. A comparison with other membranes considered for high temperature vapor dehydrations suggests that PEEK may be an excellent polymer for these applications. 相似文献
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芳香环状聚醚酮的合成是应现代高技术领域对先进复合材料的需求而发展起来的研究领域。综述了芳香环状聚醚酮的合成研究进展、合成方法,并分析各种合成方法的优势。 相似文献
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以浓硫酸为磺化剂,室温下制备了磺化聚醚醚酮(SPEEK)。以N,N-二环己基碳酰亚胺(DCC)为催化剂,将对氨基苯磺酸接枝到多壁碳纳米管(MWCNTs)的表面。采用溶液共混法制备了SPEEK/g-MWCNTs复合膜。采用傅里叶变换红外光谱仪(FT-IR)分析了复合膜的化学结构,采用光学显微镜以及扫描电子显微镜(FESEM)观察了膜的表面和断面结构,并采用交流阻抗法考察了膜的质子传导性能。结果表明:碳纳米管在复合膜中分散均匀,树脂基体包覆在碳管表面,复合膜的质子传导性和拉伸强度均优于磺化聚醚醚酮纯膜。 相似文献
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Wei Hu Xiaoxiao Liang Xue Yang Yingxue You Qi Zhao Baijun Liu Zhaoyan Sun Yongfeng Men Guangshan Zhu Haiming Xie 《大分子材料与工程》2021,306(7):2100118
In this investigation, the sulfophenylated poly (ether ether ketone ketone) (SPEEKK) separators for lithium-ion batteries (LIBs) are prepared via electrospinning. The electrospun sulfophenylated poly (ether ether ketone ketone) membranes (es-SP) are then modified with lithium bis(trifuoro-methanesulfonyl)imide (LiTFSI) by immersing in the LiTFSI/ethanol solution to obtain the modified es-SP composite separators (es-SP-Li). SPEEKK displays excellent dimensional thermal stability, and thus the thermal shrinkage of es-SP-Li-20 (20% of LiTFSI in ethanol) composite separators is only 2% after 0.5 h at 200 °C. The strong polarity of sulfonic acid groups on SPEEKK and LiTFSI enhances the electrolyte wettability and uptake, and thus afford more Li source, so as to promote the conductivity of lithium ions in the composite separators, which in turn exhibit positive impacts on the rate and cycling stability performance of LIBs. The Li//LiFePO4 cells assembled with es-SP-Li-20 separator demonstrate excellent electrochemical stability over 170 cycles at 0.2 C with a reversible discharge capacity of 153 mAh g−1, and a promising rate capacity at 2 C. In short, the as-prepared es-SP-Li composite separators with excellent comprehensive property emerge as a promising application in LIBs. 相似文献