| 查看: 704 | 回复: 4 | |||
[交流]
求翻译一段英文
|
| Two series of N-methylaniline-blocked isocyanates based on monomeric diisocyanates such as 4,4′-methylene bis(phenyl isocyanate), toluene-2,4-diisocyanate, isophorone diisocyanate and 1,6-diisocyanato hexane and their NCO terminated polyurethane prepolymer (polyisocyanates) were prepared and characterized thoroughly by FTIR, 1H NMR, 13C NMR and EI-Mass spectroscopic methods. The blocking reaction of N-methylaniline with aromatic isocyanates and aromatic polyisocyanates occur faster when compared to the aliphatic isocyanates. The deblocking reactions of blocked isocyanates were carried out under dynamic and isothermal conditions using hot-stage FTIR spectrophotometer. The dynamic method was used to determine the deblocking temperature, and the isothermal method was used to calculate kinetics and thermodynamics parameters. Cure reactions of blocked isocyanates with hydroxyl-terminated polybutadiene were also followed to establish the structure–property relationship of the N-methylaniline-blocked isocyanates. The deblocking studies of blocked isocyanates reveal that the aromatic isocyanates undergo deblocking easily compared to aliphatic isocyanates. The rate of deblocking reaction of N-methylaniline-blocked aromatic polyisocyanates was found to be higher compared to N-methylaniline-blocked aromatic monomeric diisocyanate adducts. On the other hand, this trend was just reverse in the cure-reaction studies. The dissolution behavior of N-methylaniline-blocked isocyanates in Terathane-2000, polypropylene glycol-2000, polycaprolactone diol-2000 and hydroxyl-terminated polybutadiene-2500 was also studied and found that all adducts are soluble in these polyols. |
回复此楼» 猜你喜欢
情人节自我反思：在爱情中有过遗憾吗？
已经有10人回复
-
今年春晚有几个节目很不错，点赞！
已经有7人回复
-
基金正文30页指的是报告正文还是整个申请书
已经有5人回复
-
过年走亲戚时感受到了所开私家车的鄙视链
已经有5人回复
» 抢金币啦！回帖就可以得到:
-
大连海事大学轮机学院博士名额1个
+1/170
-
山东征女友，坐标济南
+1/168
-
坐标广州，征女友
+2/134
-
ChineseResearchLaTeX: 开源、免费的vibe coding辅助国自然写作
+1/80
-
一个陌生女人的来信
+1/60
-
上海理工大学2026年系统科学学科海外骨干教师招聘启事
+2/34
-
国家级青年人才课题组招收2026级硕士研究生
+1/30
-
海南大学海洋技术与装备学院-科研助理招聘（可读博）--膜分离水处理方向
+1/29
-
国家级青年人才课题组招收2026级硕士研究生
+1/28
-
代朋友发 88公务员诚征男友
+1/20
-
2026年天津科技大学“新能源催化与膜材料团队”研究生招生
+1/17
-
英国布里斯托大学诚招博士生，博士后和联合培养生
+1/17
-
太原理工大学集成电路学院招收2026年博士研究生
+1/9
-
湖南大学-分析检测技术和生物柔性传感器-招收1名博士研究生 (2026年，第二批)
+1/6
-
全奖博士 英国利物浦大学+台湾清华大学 双博士学位
+1/5
-
中国科学技术大学 工程科学学院 国家级人才团队 诚聘博士后
+1/4
-
中北大学冯瑞教授*开山大弟子*招募
+1/4
-
怎么发布了求助贴了， 一发就转到删除栏了
+1/3
-
26申博自荐求博导-生物传感分析方向
+1/3
-
南京大学能源与资源学院徐加陵课题组招聘：科研助理、硕士生、博士生
+1/1
★ ★ ★ ★ ★
ringzhu(金币-5): 本版严禁机器翻译！ 2011-04-02 12:05:50
ringzhu(金币-5): 本版严禁机器翻译！ 2011-04-02 12:05:50
|
两种系列N-methylaniline-blocked monomeric异氰酸酯等的基础上,diisocyanates 4′-methylene四苯基异氰酸酯),国际清算银行(4-diisocyanate toluene-2,isophorone,6-diisocyanato二异氰酸酯和1 /环己烷和他们,polyisocyanates聚氨酯预聚物(兵种)终止有准备,并采用红外光谱表征彻底、核磁共振氢谱、碳谱和EI-Mass光谱方法。N-methylaniline阻断与异氰酸酯反应,芳香的polyisocyanates芳香的速度发生,相比于脂肪族异氰酸酯。异氰酸酯的反应受阻的去进行了等温条件下的动态,利用傅里叶变换红外光谱hot-stage分光光度计。动态的方法被用来确定去温度、等温法计算动力学和热力学参数。异氰酸酯与阻碍的治疗反应摘要p... 仅供参考 |
2楼2011-03-23 22:27:12
3楼2011-03-24 09:32:36
4楼2011-03-24 10:07:35
5楼2011-03-24 10:51:35