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作 者:胡权[1] 彭攀瑞 周敏[1] 胡吉龙 刘学清[1] 刘继延[1]
机构地区:[1]江汉大学化学与环境工程学院,光电化学材料与器件教育部重点实验室,武汉430056
出 处:《功能材料》2017年第5期5116-5121,共6页Journal of Functional Materials
基 金:湖北省自然科学基金重点资助项目(ZRZ2014000060)
摘 要:利用热重法比较了两种不同烷基次膦酸锌及其阻燃环氧树脂(EP)复合材料的热性能。首先探究甲基环己基次膦酸锌(Zn(MHP))、甲基乙基次膦酸锌(Zn(MEP))、Zn(MHP)/EP、Zn(MEP)/EP在N2氛围下的热稳定性。然后运用Kissinger法、Flynn-Wall-Ozawa(简称FWO法)计算出EP、Zn(MHP)、Zn(MEP)、EP/Zn(MHP)、EP/Zn(MEP))热分解活化能E、指前因子lnAk,并结合Coast-Redfern理论模型机理函数g(α),求得反应级数n。结果表明,Zn(MHP)比Zn(MEP)具有更高的热稳定性和表观热分解活化能。同时Zn(MHP)或Zn(MEP)能明显提高EP的热稳定性能,延迟EP的分解、提高残碳率和热分解活化能。当添加量为均为20%(质量分数)时,EP/Zn(MHP)的热分解活化能高于EP/Zn(MEP)。Coats-Redfern法推断Zn(MHP)的热分解机理为g(a)=-ln(1-α),反应级数即为1,Zn(MEP)的机理函数为g(a)=3[1-(1-α)^(1/3)],反应级数为1/3。EP/Zn(MHP)和EP/Zn(MEP)的热分解机理函数与EP一致,均为g(a)=[-ln(1-α)]^(2/3),反应级数为2/3。In this study, thermal stability and decomposition kinetics of Zn(MHP) and Zn(MEP) as well as epoxy(EP) flame retardants system were investigated by thermogravimetric analysis. The average activation energy (E&) and pre-exponential factor A of decomposition were calculated with Flynn-Wall-Ozawa (FWO) and Kissinger method. Coats-Redfern method was used to discuss the probable degradation mechanism by selection of different mechanical models. The results show that the E& value obtained from Kissinger method is in good a-greement with the value from FWO method. Zn(MHP) shows higher thermal stability and has higher E& value than Zn(MEP). Adding Zn(MHP) or Zn(MEP) into EP can improve the thermal stability and delay the E& of EP, the char residue and the decomposition of EP. When the filler loading is kept at 2〇 wt%,EP/Zn(MHP) has higher E& than EP/Zn(MHP). The solid state decomposition mechanism with Coats-Redfern method for Zn (MHP) is in accordance with the function oi g( a) - -ln ( l - a) with n - 1. The decomposition mechanism of Zn (MEP) corresponds to the function of g(a )二 3[1 - (1-a )1 3] with n=l/3. EP/Zn(MHP) and EP/Zn(MHP) have the same thermal decomposition mechanism, which proposes to the function oig ( a ) -ln ( l-a ) ] 2/3 withn - 2/3.
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