摘要
利用蓖麻油(CO)与2,4-甲苯二异氰酸酯(TDI)制备的聚氨酯预聚体(CO-TDI),在少量引发剂过氧化苯甲酰(BPO)和催化剂二丁基二月桂酸锡(BTL)的作用下与苯乙烯(St)形成了一种互穿网络型聚合物(IPN),利用红外光谱分析研究了固化条件对体系中剩余-NCO潮气固化的影响,以及固化反应的动力学。结果表明,随着固化温度和相对湿度增大,IPN的潮气固化反应速率明显加快;IPN中剩余-NCO的潮气固化为一级动力学反应,在温度为23℃、30℃和40℃时固化反应的速率常数k分别为0.0716、0.1099和0.1640,固化反应的表观活化能为34.44 kJ/mol。
The polyurethane-ureas prepolymer （CO-TDI） was prepared by cast oil （CO） and 2,4- Toluene diisocyanate （TDI）. Then a interpenetrating polymer networks （IPN） （CO-TDI/St） based on the prepolymer CO-TDI and phenylethylene （St） were preformed in dibenzoyl peroxide （BPO） as initiator and Dibutyl tin laurate （BTL） as catalyst. The effects of the temperature and relative humidity on the moisture cure of the excess isocyanate in IPN, and moisture curing kinetics were investigated by Fourier transfer infm spectrophotometer. The results show that the rate of moisture curing increases with the increase of temperature and relative humidity. Furthermore, moisture cure of the excess isocyanate in IPN is first-order reaction. At 23 ℃, 30 ℃ and 40 ℃, the rate constant k of the moisture curing reaction is 0.0716,0.1099 and 0.1640, respectively. The apparent activation energy of the reaction is 34.44 kJ/mol.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第6期129-131,135,共4页
Polymer Materials Science & Engineering
基金
湖北省科技攻关项目(2005101AAC64)
关键词
互穿网络聚合物
蓖麻油
聚氨酯
潮气固化
动力学分析
interpenetrating polymer networks
cast oil
polyurethane
moisture curing
kinetics
