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21.
Asymmetric membranes fabricated from poly(acrylonitrile-co-maleic acid) (PANCMA) were immobilized with heparin and/or insulin to improve their surface properties. These biomacromolecule-immobilized PANCMA membranes were prepared by the amination of the membrane surface with ethylenediamine, followed by the reaction of the amino groups with heparin and/or insulin in the presence of 1-ethyl-3-(3-dimethyl amidopropyl) carbodiimide. The surface-modified membranes were analyzed by X-ray photoelectron spectroscopy to confirm the immobilization of the biomacromolecules. Morphological changes on the membrane surface and in the cross section were characterized by scanning electron microscopy. The surface hydrophilicity and hemocompatibility of the studied membranes were evaluated on the basis of water contact angle, platelets adhesion and cell attachment measurements. It was found that, after the immobilization of the biomacromolecules, the water contact angle and the amount of adhered platelets and macrophages on the membrane decreased significantly when compared with the nascent ones, indicating the improvement of surface hydrophilicity. Furthermore, the heparin immobilized membrane showed the best hemocompatibility among the corresponding membranes studied. 相似文献
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本文针对中压汽包法兰断裂失效原因进行分析,指出汽包上两个法兰同时断裂的原因在于安全阀排汽管路设计上的失误,并提出对安全阀排汽系统的改进措施。 相似文献
26.
Y. B. Che Man L. S. Wei A. I. Nelson N. Yamashita 《Journal of the American Oil Chemists' Society》1991,68(7):471-473
Soaking soybeans in dilute acids affected activities of lipoxygenase, trypsin inhibitor and urease. Effects of soaking time,
acid concentration and soaking temperature were investigated. Lipoxygenase activity was completely eliminated by soaking in
0.3 M HC1 at either 23°C or 40°C for 8 hr. Less than 50% trypsin inhibitor remained and urease was inactivated to an acceptable
level (0.04 ΔpH). 相似文献
27.
采用吸附材料进行油水分离是经济且非常有效的方法。吸附材料主要有无机材料、合成高分子材料和天然有机纤维材料等。相比较而言,天然有机纤维材料为可再生生物质资源,来源广泛、生物降解性好,可有效防止二次污染,具有良好的发展潜力,备受关注。本文首先简要介绍了油水乳液稳定性的影响因素,然后综述了油水分离材料的分离原理、构建方法和分离性能等研究进展,并总结了油水乳液分离材料的表征及其分离性能的评价指标。特别地,重点总结了天然有机纤维基吸附材料分离油水乳液的研究进展。最后指出研究智能响应型天然有机纤维基油水乳液分离吸附材料是重要的发展方向。 相似文献
28.
M. S. Miskandar Y. B. Che Man M. S. A. Yusoff R. Abdul Rahman 《Journal of the American Oil Chemists' Society》2002,79(9):931-936
The effects of scraped-surface tube cooler temperatures on the isothermal solid fat content (SFC) of palm oil margarine during
processing and on margarine consistency (yield value, g/cm2), SFC, and polymorphic changes in storage were studied. SFC was measured in the mixing tank after leaving the tube cooler
and the pin worker. The SFC at the tube cooler exit was proportional to the amount of cooling; a higher SFC was produced by
more extreme cooling treatment. The SFC of all margarines were reduced in the pin worker, and the reduction was related to
the initial SFC profile of palm oil. Margarine samples were stored at 28°C for 28 d and tested daily. Margarine processed
at 25°C in the tube cooler had the highest consistency and the least change in SFC, but by the second week crystals had transformed
into the β form. Uniform product consistency and SFC were observed in margarines processed at 20 and 15°C. These margarines
retained the β′ crystal form for 3 and 4 wk, respectively. The best palm oil margarine was obtained with a tube cooler temperature
of 15°C and a residence time of 1.8 min. 相似文献
29.
The structure of benzoxazines is similar to that of phenolic resin through thermal self‐curing of the heterocyclic ring opening reaction that neither requires catalyst nor releases any condensation byproduct. These polybenzoxazine resins have several outstanding properties such as high thermal stability and high glass transition temperature. To better understand the curing kinetics of this copolybenzoxazine thermosetting resin, dynamic and isothermal differential scanning calorimetry measurements were performed. Three models, the Kissinger method, the Flynn–Wall–Osawa method, and the Kamal method, were used to describe the curing process. Dynamic kinetic activation energies based on Kissinger and Flynn–Wall–Osawa methods are 72.11 and 84.06 KJ/mol, respectively. The Kamal method based on an autocatalytic model results in a total order of reaction between 2.66 and 3.03, depending on curing temperature. Its activation energy and Arrhenius preexponential are 50.3 KJ/mol and 7959, respectively. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 730–737, 2005 相似文献
30.
丙烯酸乙酯合成反应产物的GC/MS分析 总被引:1,自引:0,他引:1
本文叙述了丙烯酸乙酯合成产物的GC/MS分析.从分析结果看出,本应在酯化反应前除去的CH3Cl3仍有较大的含量,这也许是导致丙烯酸乙酯被氯代的原因。 相似文献