Studies on the curing and thermal behaviour of diglycidyl ether of bisphenol-A (DGEBA) in the presence of aromatic diimide–diacids
作者:Darshan Singh、Anudeep Kumar Narula
DOI:10.1007/s10973-009-0089-1
日期:2010.4
This paper describes the synthesis and characterization of aromatic diimide–diacids (DIDAS) obtained by reacting pyromellitic dianhydride (PMDA), 4,4′-oxo diphthalic anhydride (ODA), 1,4,5,8-naphthalene tetra carboxylic dianhydride (NTDA) with excess of 4-aminobutyric acid (B) or 6-aminohexanoic acid (H) using N,N-dimethyl formamide (DMF) as solvent. The synthesized compounds were used as curing agents to investigate the effect of structure on the curing and thermal behaviour of diglycidyl ether of bisphenol-A (DGEBA). Structural characterization of DIDAS was done by using FTIR, 1H-NMR, 13C-NMR spectroscopy and elemental analysis. Curing behaviour of DGEBA in the presence of aromatic DIDAS was investigated by differential scanning calorimetry (DSC). The peak exotherm temperature (T P) was low in the case of DIDAS synthesized from ODA and high in the case of DIDAS synthesized from NTDA. Thermal stability of the isothermally cured DGEBA with DIDAS was investigated using dynamic thermogravimetry in nitrogen atmosphere. The char yield was highest for resin cured with DIDAS containing NTDA.
本文描述了通过使用N,N-二甲基甲酰胺(DMF)作为溶剂,将均苯四甲酸二酐(PMDA)、4,4′-氧双邻苯二甲酸酐(ODA)、1,4,5,8-萘四甲酸二酐(NTDA)与过量的4-氨基丁酸(B)或6-氨基己酸(H)反应合成得到的芳香二咪唑二酸(DIDAS)的合成及其表征。这些合成的化合物被用作固化剂,以研究其结构对双酚A二缩水甘油醚(DGEBA)固化和热行为的影响。DIDAS的结构表征通过FTIR、1H-NMR、13C-NMR光谱学和元素分析完成。DGEBA在芳香DIDAS存在下的固化行为通过差示扫描量热法(DSC)进行研究。由ODA合成的DIDAS的峰值放热温度(T P)较低,而由NTDA合成的DIDAS的峰值放热温度较高。使用氮气氛围下的动态热重分析法研究了与DIDAS等温固化的DGEBA的热稳定性。含NTDA的DIDAS固化树脂的碳残余量最高。