Kinetic Study and Synthesis of Aliphatic Polyurethane Foam
Date Issued
2006
Date
2006
Author(s)
Yu, Chia-Hao
DOI
zh-TW
Abstract
Kinetics of the catalyzed reaction between isophorone diisocyanate(IPDI) and hydroxyl-terminated Polyolpolypropylene glycol(PPG) and polytetramethylene glycol(PTMG) and the reaction between isocyanate-terminated prepolymer (IPDI-PPG2000-IPDI) and water was investigated by using FTIR spectroscopy.Dibutyltin dilaurate(DBTDL) was used as the prepolymeriztion catalyst and various tertiary amines were used for the foaming reaction catalysts ,the reaction was followed by monitoring the change in intensity of the absorption band at 2270 cm-1 for NCO stretching in the FTIR spectrum,and the activation parameters were obtained from the evaluation of kinetic data at different temperatures in the range of 30~60℃.Analysis of the kinetic data indicates that the isocyatate-hydroxyl reaction for prepolymerization was shown to follow a second-order kinetics in the initial stage ,while in bulk polymerization that we find an autoacceleration reaction obviously and reaction was shown to follow a third-order kinetics. Steric structure has a great effect on the isophorone diisocyanate’s reaction .An activation energy of 64.88kJ/mol for the reaction between IPDI and PPG2000 under DBTDL catalyzed and that of 70~90kJ/mol for the reaction between isocyanate-terminated prepolymer and water under tertiary amines catalyzed showed that the influence of the temperature in urea-forming reaction is higher than the urethane-forming reaction.Finally the effects of PPG monomer,catalyst,surfactant,blow agent,chain extender and synthetic process on the properties of flexible polyurethane foam were investigated.
Subjects
異佛爾酮二異氰酸酯
傅立葉轉換紅外光儀
催化劑
聚胺基甲酸酯泡沫塑料
Isophorone diisocyanate (IPDI)
Catalyst
Activation energy
Kinetics
Type
thesis