摘要本论文文采用N100的两种典型结构(HDI和双缩二脲结构)分别与不同链节的PEG进行模拟计算。运用G03程序,在高水平密度泛函理论下(B3LYP/6-31G**),对上述固化反应进行了反应物、反应中间物种及过渡态的结构优化、频率分析、布局分析,前线轨道分析以及IRC分析,获得了该固化反应的简单条件下的反应机理以及一系列热力学和动力学数据,并发现PEG的链节对该固化反应的活化能影响程度不是很大。5652
关键字 活化能 PEG(聚乙二醇) 异氰酸酯 HDI(吹冰亚甲基二异氰酸酯) 双缩二脲 密度泛函理论
毕业设计说明书(论文)外文摘要
Title A computational study of the hydroxy terminated polyether and isocyanate
Abstract
The density functional theory method B3LYP/6-31G** was performed to calculate the reaction between N-100(HDI and biuret structure) and PEG with different chain length , using G03 program . The structural optimization , frequency analysis , population analysis, frontier orbital analysis and the IRC analysis with reactants were performed for the reaction intermediate species and transition states . Then we can get the reaction mechanism under simple conditions of the curing reaction and a series of thermodynamic and kinetic data . Eventually we found that the PEG chain of the curing reaction has little effect on activation energy and get a series of thermodynamic and kinetic data about the reaction mechanism under simple conditions of the curing reaction .
Keywords Activation Energy Polyethylene Glycol(PEG) Isocyanate Isocyanate Hexamethylene Diisocyanate(HDI)
Density Function Theory(DFT)
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