PET固化条件对BDNPA/F增塑剂热氧化稳定性的影响

Effect of PET curing conditions on the thermal oxidation stability of BDNPA/F plasticizer

采用非等温热分析动力学方法,对不同固化剂种类、固化系数等环氧乙烷/四氢呋喃共聚醚(PET)固化条件下,偕二硝基类增塑剂BDNPA/F的热氧化分解动力学进行了研究。结果表明,在500 K以下,BDNPA/F的热氧化分解历程可分为2个阶段,其动力学机理函数分别符合n=4及n=3的化学反应级数函数。BDNPA/F的热氧化稳定性随固化系数的增加而提高。与多官能度异氰酸酯(N100)/1-戊基-2-庚基-3,4-二(异氰酸壬酯)环己烷(DDI)混合固化剂相比,单独使用官能度更高的N100固化剂可形成更致密的交联网络,使BDNPA/F增塑剂具有更高的热氧化分解活化能。

The non- isothermal reaction kinetics method was used to study the thermal oxidation kinetics of geminal dinitro plasticizer BDNPA/F under different curing conditions （different curing agent types and curing coefficients ） of ethylene oxide/ tetrahydrofuran copolyether （PET）. The results showed that the thermal oxidation decomposition process of BDNPA/F could be divided into two stages under 500 K. The dynamic mechanism functions was consistent with the n = 4 and n = 3 chemical reaction order function, respectively. With the increasing of curing coefficient, the thermal oxidation stability of BDNPA / F plasticizer was increased. Comparing with the polyfunctional isocyanates （ N100 ） / 1 - peutyl - 2 - heptyl - 3 , 4 - bis （isocyanurate） cyclohexane （DDI）mixed curing agent, the crosslink network density was higher only using NIO0 as curing agent for its higher functionality, so that the BDNPA/F plasticizer had a higher thermal oxidation decomposition activation energy.