分别以三乙胺（TEA）、1,4-二氮杂二环[2.2.2]辛烷（DABCO）、二月桂酸二丁基锡（DBTDL）、辛酸亚锡（SO）作催化剂,在甲苯溶液中进行了异佛尔酮二异氰酸酯（IPDI）与苯甲醇的反应,对比了IPDI中不同异氰酸酯基的反应活性,并探讨了催化剂、温度等对其活性差异的影响。结果表明,TEA、DABCO作催化剂时,IPDI中异氰酸酯基的活性差异并不明显;DBTDL、SO作催化剂时,则存在明显的活性差异,仲脂环异氰酸酯基的活性大于伯异氰酸酯基的活性,而且SO作催化剂时活性差异更加显著。此外,根据不同温度的反应速率常数计算了各异氰酸酯基的活化能：DBTDL作催化剂时,伯仲异氰酸酯基的活化能分别为62.68 kJ/mol和53.02 kJ/mol;SO作催化剂时,伯仲异氰酸酯基的活化能分别为63.60kJ/mol和57.01 kJ/mol。
The reaction between IPDI and benzyl alcohol in the solvent of toluene was catalyzed by trimethylamine （TEA）, 1,4-diazabicyclo [ 2.2.23 octane （I）ABCO）, dibutyltiondilaurate （DBTDL） and stannousoctanoate （SO）, respectively. A comparative research between the two - NCO groups in IPDI was done. The effects of temperature and catalyst were discussed. It shows that the difference of reactivity between the two -NCO groups is affected slightly by TEA or DABCO, while it is affected largely by DBTDL or SO. Cycloaliphatic -NCO reacted more rapidly than aliphatic -NCO, especially using SO as catalyst. The activation energy of aliphatic -NCO and Cycloaliphatic -NCO in DBTDL system is 62.68 kJ/mol and 53.02 kJ/mol respectively, and in the SO system is 63.60 kJ/mol and 57.01 kJ/mol respectively.
参考文献
| [1] | Yilgor I;Yilgor E;Guler IG;Ward TC;Wilkes GL .FTIR investigation of the influence of diisocyanate symmetry on the morphology development in model segmented polyurethanes[J].Polymer: The International Journal for the Science and Technology of Polymers,2006(11):4105-4114. |
| [2] | Piotr Krol .Synthesis methods, chemical structures and phase structures of linear polyurethanes. Properties and applications of linear polyurethanes in polyurethane elastomers, copolymers and ionomers[J].Progress in materials science,2007(6):915-1015. |
| [3] | Gite, V.V.;Mahulikar, P.P.;Hundiwale, D.G. .Preparation and properties of polyurethane coatings based on acrylic polyols and trimer of isophorone diisocyanate[J].Progress in Organic Coatings: An International Review Journal,2010(4):307-312. |
| [4] | Desilets S;Villeneuve S;Laviolette M;Auger M .C-13-NMR spectroscopy study of polyurethane obtained from azide hydroxyl-terminated polymer cured with isophorone diisocyanate (IPDI)[J].Journal of Polymer Science, Part A. Polymer Chemistry,1997(14):2991-2998. |
| [5] | Yang, PF;Li, TD;Li, JY;Zhu, XW;Xia, YM .KINETICS AND MECHANISM OF CARBAMATE REACTION OF 4-HYDROXYBENZYL ALCOHOL WITH PHENYL ISOCYANATE[J].Progress in reaction kinetics and mechanism,2010(1):93-104. |
| [6] | Ashish Aneja;Garth L. Wilkes;Ersin Yurtsever;Iskender Yilgor .Influence of lithium chloride on the morphology of flexible slabstock polyurethane foams and their plaque counterparts[J].Polymer: The International Journal for the Science and Technology of Polymers,2003(3):757-768. |
| [7] | 宋春梅,薛海丽,庄小璐,黄奕.异佛尔酮二异氰酸酯自聚产物的13C-NMR研究[J].高分子学报,2006(05):660-665. |
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