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qq5391297鐵桿木蟲(chóng) (著名寫(xiě)手)
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| 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. |
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ringzhu(金幣-5): 本版嚴(yán)禁機(jī)器翻譯！ 2011-04-02 12:05:50
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兩種系列N-methylaniline-blocked monomeric異氰酸酯等的基礎(chǔ)上,diisocyanates 4′-methylene四苯基異氰酸酯),國(guó)際清算銀行(4-diisocyanate toluene-2,isophorone,6-diisocyanato二異氰酸酯和1 /環(huán)己烷和他們,polyisocyanates聚氨酯預(yù)聚物(兵種)終止有準(zhǔn)備,并采用紅外光譜表征徹底、核磁共振氫譜、碳譜和EI-Mass光譜方法。N-methylaniline阻斷與異氰酸酯反應(yīng),芳香的polyisocyanates芳香的速度發(fā)生,相比于脂肪族異氰酸酯。異氰酸酯的反應(yīng)受阻的去進(jìn)行了等溫條件下的動(dòng)態(tài),利用傅里葉變換紅外光譜hot-stage分光光度計(jì)。動(dòng)態(tài)的方法被用來(lái)確定去溫度、等溫法計(jì)算動(dòng)力學(xué)和熱力學(xué)參數(shù)。異氰酸酯與阻礙的治療反應(yīng)摘要p... 僅供參考 |
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