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

2019 ◽  
Vol 138 (4) ◽  
pp. 2435-2444 ◽  
Author(s):  
Beata Mossety-Leszczak ◽  
Maciej Kisiel ◽  
Jaromir B. Lechowicz ◽  
Natalia Buszta ◽  
Robert Ostatek ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Modulated Dsc ◽  
Curing Reaction ◽  
Temperature Modulated Dsc ◽  
Liquid Crystalline Epoxy

Synthesis of Three Novel Aromatic Biazomethine Liquid- Crystalline Epoxy Resins and Curing Reaction with Aromatic Diamine

2011 ◽  
Vol 216 ◽  
pp. 34-38
Author(s):  
Jun Gang Gao ◽  
Xiao Na Zhang ◽  
Yong Gang Du
Keyword(s):  
Melting Point ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Diphenyl Ether ◽  
Hydroxyl Group ◽  
Aromatic Diamine ◽  
Curing Reaction ◽  
Ozawa Equation ◽  
Liquid Crystalline Epoxy ◽  
Clearing Temperature

Three class of novel liquid crystalline epoxy resins containing azomething groups: N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEPBDDE), N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl methane (p-BEPBDDM) and N,N’-Bis[(4-(2,3-epoxypropoxy)-benzyliden)-1,4- phenylene diamine] (p-BEPBPD) were synthesized and characterized. The results show that p-BEBDDE and p-BEBDDM belong to smectic texture and melting point is 239.5 and 178 oC, respectively. The p-BEPBD is nematic texture between its melting temperature (Tm) of 192 oC and clearing temperature (Ti) of 238 oC. The curing reaction can be described by Ozawa equation, and the alcohol-hydroxyl group can accelerate the curing reaction and decrease Ea in DSC experiment.

Study on Curing Mechanism of Azo-Containing Twin Liquid Crystalline Epoxy Resins with Anhydride

2013 ◽  
Vol 702 ◽  
pp. 119-122
Author(s):  
Teng Fei Shen ◽  
Fa Chao Wu ◽  
Ying Juan Sun
Keyword(s):  
Differential Scanning Calorimetry ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Kinetics ◽  
Scanning Calorimetry ◽  
Curing Reaction ◽  
Azo Group ◽  
Liquid Crystalline Epoxy ◽  
Curing Mechanism ◽  
Kinetics Of

A series of novel azo-containing twin liquid crystalline (LC) epoxy monomers were cured with anhydrides without extra catalyst and the curing kinetics was investigated by non-isothermal differential scanning calorimetry (DSC) technique. The effect of Azo group on the Curing Kinetics of Epoxy/anhydride System was investigated and the result showed that Azo group served as a catalyst to accelerate the curing reaction. The curing mechanism was confirmed by the UV-Vis spectrum.

Modeling of Curing Reaction Kinetics in Liquid-Crystalline Epoxy Resins

1997 ◽  
Vol 36 (8) ◽  
pp. 2976-2983 ◽  
Author(s):  
Giovanni Micco ◽  
Marta Giamberini ◽  
Eugenio Amendola ◽  
Cosimo Carfagna ◽  
Gianni Astarita
Keyword(s):  
Reaction Kinetics ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Curing Reaction ◽  
Liquid Crystalline Epoxy

Effects of modifiers in organoclays on the curing reaction of liquid-crystalline epoxy resin

2005 ◽  
Vol 96 (4) ◽  
pp. 1329-1334 ◽  
Author(s):  
Min-Min Shen ◽  
Man-Geng Lu ◽  
Yong-Lie Chen ◽  
Cheng-Yong Ha
Keyword(s):  
Epoxy Resin ◽  
Liquid Crystalline ◽  
Curing Reaction ◽  
Liquid Crystalline Epoxy

scholarly journals Curing Reaction and Dielectric Properties of Rigid and Elastic Liquid Crystal Epoxy Networks Modified with Nanofillers

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Magdalena Włodarska
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Liquid Crystalline ◽  
Polymer Networks ◽  
Calorimetric Study ◽  
Pimelic Acid ◽  
Good Tool ◽  
Epoxy Networks ◽  
Curing Reaction ◽  
Liquid Crystalline Epoxy

The aim of the paper is to compare the progress of the curing reaction and the dielectric properties of liquid crystalline epoxy networks of different elasticity and to investigate how modification with nanofillers influences their properties. The study focuses on a liquid crystalline epoxy monomer with four aromatic rings in the mesogen, cross-linked with 4,4′-diaminodiphenylmethane (DDM) and pimelic acid (PA) to produce rigid and elastic polymer networks. The obtained results are compared to networks modified with nanofillers (diphenyl aluminum phosphate nanorods). The curing process is monitored in situ with broadband dielectric spectroscopy, which is a good tool to view the progress of the reaction. Two stages with different reaction dynamics are observed in the studied cases. Dielectric properties of the products cured with two chosen agents show significant differences in the obtained parameters (activation energy, glass transition, and fragility index) as well as in the dynamics of the α and β relaxations. Although the curing agent is the main factor determining the properties of the product, the nanofiller additive also modifies the values of specific parameters that characterize both the process of the reaction and the properties of the final composites. Particularly, adding the nanofiller raises the glass transition temperature in both the cases. The obtained results are in good agreement with the earlier calorimetric study.

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