Analysis of curing reaction of liquid-crystalline epoxy compositions by using temperature-modulated DSC TOPEM®

被引:13
|
作者
Mossety-Leszczak, Beata [1 ]
Kisiel, Maciej [1 ]
Lechowicz, Jaromir B. [1 ]
Buszta, Natalia [1 ]
Ostatek, Robert [2 ]
Wlodarska, Magdalena [3 ]
机构
[1] Rzeszow Univ Technol, Fac Chem, Dept Ind & Mat Chem, Al Powstancow Warszawy 6, PL-35959 Rzeszow, Poland
[2] Rzeszow Univ Technol, Fac Chem, Lab Spectrometry, Al Powstancow Warszawy 6, PL-35959 Rzeszow, Poland
[3] Lodz Univ Technol, Inst Phys, Fac Tech Phys Informat Technol & Appl Math, Wolczanska 219, PL-90924 Lodz, Poland
关键词
Liquid-crystalline epoxy resins; Curing process; Temperature-modulated DSC; Thermosets; CURE KINETICS; RESIN; BEHAVIOR;
D O I
10.1007/s10973-019-08193-w
中图分类号
O414.1 [热力学];
学科分类号
摘要
The curing behaviour of the composition of a liquid-crystalline diepoxy monomer (LCEM) with the central triaromatic mesogenic group was studied using differential scanning calorimetry, conventional DSC and temperature-modulated TMDSC and nuclear magnetic resonance H-1-NMR spectroscopy. The stoichiometric amount of primary aromatic diamine, 4,4'-diaminodiphenylmethane (DDM), was used as a curing agent. TMDSC TOPEM (R) allowed the separation of the thermal effects related to reversible processes (e.g. phase transitions) from irreversible processes (cross-linking reaction) and determining that irreversible curing reaction occurs at the same time as reversible transition of the LCEM from crystal to the liquid-crystalline nematic phase. Additionally, H-1-NMR analysis of the LCEM/DDM mixture preheated to a temperature from the temperature range of complex thermal changes was conducted. The obtained spectrum clearly showed the presence of partially cured products in the investigated samples and additionally proved that during the endothermic phase transition of the LCEM monomer an exothermic cross-linking reaction was occurring.
引用
收藏
页码:2435 / 2444
页数:10
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