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21.
Low-Temperature Plasma Induced Grafting of 2-Methacryloyloxyethyl Phosphorylcholine onto Poly（tetrafluoroethylene） Films 总被引：1，自引：0，他引：1
Modification of poly(tetrafluoroethylene) (PTFE) films with 2-methacryloyloxyethyl phosphorylcholine (MPC) was performed by
low-temperature plasma treatment and grafting polymerization. Surface properties of PTFE were characterized by attenuated
total reflectance Fourier transform infrared (ATR-FTIR) spectra, X-ray photoelectron spectroscopy (XPS), and static contact
angle. The results show that MPC has been grafted onto PTFE film surface successfully. Contact angle for the modified PTFE
films in the water decreased from 108° to 58.25°, while surface energy increased from 17.52 mN/m to 45.47 mN/m. The effects
of plasma treatment time, monomer concentration and grafting time on degree of grafting were determined. In the meanwhile,
blood compatibility of the PTFE films was studied by checking thrombogenic time of blood plasma. 相似文献
22.
研究了淀粉与苯乙烯在Ce^4＋ — S2O8^2-复合引发剂存在下的悬浮接枝共聚，并用红外光谱证实了接枝产物，讨论了淀粉预处理方式、反应温度、引发剂浓度、淀粉与苯乙烯配比等因素对单体转化率、接枝率、接枝效率的影响，结果表明，通过悬浮接枝聚合，产物保持原淀粉的颗粒状，后处理简单，最高接枝率可达47．4％，接枝效率可达78.0％。 相似文献
23.
钱久元 《合肥教育学院学报》2012,(3):100-106
＂美声唱法＂早已传入中国并已开花结果,但多年以来中国的民族歌剧体系却一直未能建立起来,这是个重大缺憾。因此研究建议采用＂移植法＂和＂嫁接法＂来解决创建中国民族歌剧体系的问题。＂移植法＂是引进欧美歌剧,把欧美歌剧逐渐中国化,＂嫁接法＂是中国传统戏曲的逐步欧美化,是从中国戏曲里＂中心开花＂式地嫁接出中国民族歌剧体系来。 相似文献
24.
Nai-kuan Chou Meng-lin Lee Shoei-shen Wang 《Journal of Zhejiang University. Science. B》2009,10(10):748-752
While traditional open vein harvest was related to postoperative wound complications, endoscopic vein harvest was developed to minimize the morbidity in the greater saphenous vein harvest procedure. In this study, these two procedures were compared for postoperative wound healing and long-term graft patency. We reviewed all consecutive patients undergoing elective off-pump coronary artery bypass grafting from January 2004 to December 2005 and collected data regarding wound complications and coronary events. Wound complications included dehiscence, excessive discharge, edema, altered sensation, cellulitis, hema-toma, pain scale, and superlicial and deep wound infection. Coronary events were defined as diagnosis of myocardial infarction during the first year's follow-up. A total of 392 patients were included in our series, among whom 44 were excluded from the study due to emergent operation, preoperative intra-aortic balloon pump support, or the greater saphenous vein varicose characteristic, 78 belonged to open vein harvest group, and 270 to endoscopic vein harvest group. Wound complications were significantly less in the endoscopic group (5.2%) compared to the open group (19.2%) (P=0.0002). There was no significant difference on preopera-tive risk factors, total operative time, or hospitalization days. During one-year follow-up, both the early and late graft patency rates were similar between the two groups. Endoscopic vein harvest is safe and effective, which carries less risk for wound complica-tions and is associated with better satisfaction and cosmetic result than the traditional greater saphenous vein harvest procedure. The endoscopic vein harvest also demonstrates a great long-term patency. 相似文献
25.
研究了基肥水平和整枝方式对嫁接甜椒结果和产量的影响。结果表明,嫁接甜椒适宜的肥量为中等以上肥力地块每667㎡施腐熟优质鸡粪4000kg左右。嫁接甜椒植株生长势增强,适宜采取三干整枝方式。 相似文献
26.
影响核桃嫁接成活率因素的研究 总被引：1，自引：0，他引：1
采用对照实验方法,比较不同的砧木处理、接穗种类及接芽部位、切口高度、嫁接时间、绑缚处理下核桃嫁接成活率,旨在通过实验探究影响汾阳市核桃苗嫁接成活率的因素,以期更好地指导生产实践. 相似文献
27.
采用直径约60mm的壳聚糖-对羟基苯甲酸膜对Cu2＋的吸附进行了研究,结果表明：吸附量随着振荡时间、pH值、温度、Cu2＋初始浓度的增加而增大。对实验数据运用相关数学模型拟合,显示等温吸附平衡符合Freundlich模型,吸附过程动力学更符合二级反应。 相似文献
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29.
纸浆接枝改性制备高吸水性树脂的研究 总被引：6，自引：0，他引：6
采用纸浆纤维素为分子骨架，接枝丙烯酸及丙烯酰胺制备高吸水树脂。对单体用量、引发剂用量、中和度、反应温度等工艺条件进行了优化研究。利用IR图表征了产物的结构。 相似文献
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