蓖麻油TDI聚氨酯互穿网络的热降解  

Thermal Decomposition of Interpenetrating Polymer Networks from Castor Oil-Based TDI Polyurethane

作　　者：石红娥[1] 谭晓明[1] 胡远强[1] 徐闫[1] 

机构地区：[1]孝感学院化学系,孝感432100

出　　处：《应用化学》2008年第3期369-371,共3页Chinese Journal of Applied Chemistry

基　　金：湖北省科技攻关项目(2005101AAC64)

摘　　要：利用蓖麻油（CO）、2，4-甲苯二异氰酸酯（TDI）与苯乙烯（St）、丙烯腈（AN）、甲基丙烯酸甲酯（MMA）反应制得了CO-TDI／St、CO-TDI／AN、CO-TDI／MMA 3种互穿网络型聚合物（IPN）。采用热分析（DSC、TG）和FTIR-TG测试技术研究了IPN的耐热性、热分解产物与温度的关系。结果表明，在受热过程中IPN的降解是分步进行的，聚氨酯网络的降解在240-330℃。聚烯烃网络的降解在330-390℃，聚合物的后期降解在390～500℃；聚氨酯网络的降解主要形成CO2、H2O和异氰酸酯、醇等，聚烯烃网络的降解主要形成烯烃、烷烃化合物；在聚合物的后期降解过程中不产生CO2和H2O；体系组成对IPN的耐热性有一定的影响，3种IPN中CO-TDI／AN的耐热性最好，CO-TDI／St与CO-TDI／MMA降解过程中的焓变量和降解速率比较相近。Three kinds of interpenetrating polymer networks （ CO-TDI/St, CO-TDI/AN, CO-TDI/MMA） were synthesized by a stepwise reaction of castor oil（CO） with 2,4-Toluene diisocyanate（ TDI）, crosslinking agent phenylethylene（ St）, Acrylonitrile （ AN ）, methyl methacrylate （ MMA ）. Thermal stability of IPN and its decomposition products were studied by differential scaning calorimetry （DSC）, thermogravimetric analysis （TG） and FTIR-TG. The results show the IPN degeneration is a fractional process during heating. The decomposition of the polyurethane network probably took place between 240 - 330 ℃. The decomposition of the polyolefine network probably took place between 330 - 390 ℃. The later period decomposition of the polymer took place approximately at 390 -500 ℃. The decomposition products of the polyurethane network were mainly CO2, H2 O, isocyanate, alcohol and so on. The decomposition products of polyolefin network mainly formed the alkene, paraffins. In the decomposition products of the later period of polymer did not includes CO2 and H2O. The system composition had influence on the IPN thermal stability. In three kinds of IPNs, CO-TDI/AN thermal stability is best, the decomposition enthalpy variable and speed of CO-TDI/St and CO-TDI/MMA are quite similar.

关 键 词：互穿网络聚合物 蓖麻油 聚氨酯 甲苯二异氰酸酯 热降解 

分 类 号：O631.2[理学—高分子化学]