scholarly journals Thermooxidative Behavior of Some Paint Materials in Natural Ester Based Electro-insulating Fluid

2018 ◽  
Vol 55 (2) ◽  
pp. 201-206
Author(s):  
Eduard Marius Lungulescu ◽  
Iosif Lingvay ◽  
Livia Carmen Ungureanu ◽  
Traian Rus ◽  
Adriana Mariana Bors
Keyword(s):  
Thermal Stability ◽  
Epoxy Resins ◽  
Oxygen Affinity ◽  
Paint Layer ◽  
Transformer Oil ◽  
High Oxygen Affinity ◽  
Closed Systems ◽  
Natural Ester ◽  
Thermal Stability Of ◽  
Paint Materials

ATR / FTIR and DSC techniques have been used to evaluate the thermal stability of some ageing paint materials by heat treatment while immersion in natural ester-based electro-insulating oil. Experimental determinations have highlighted the fact that the investigated paint materials (epoxy resins) have a high oxygen affinity and thus, in closed systems (such as power transformers), they oxidize before coming into contact with the transformer oil. This behavior indicates that the paint layer (suitably chosen) applied on the inside of the transformer vat functions as an antioxidant and results in increasing the thermal stability of the oil.

Intumescent Flame Retardant Epoxy Resins Based on Condensation Polymers of P-Phenylenediamine and Bispirocyclic Pentaerythritol Diphosphate

2012 ◽  
Vol 482-484 ◽  
pp. 1863-1868 ◽  
Author(s):  
Ya Wen Huang ◽  
Jia Jun Ma ◽  
Jun Xiao Yang
Keyword(s):  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Char Residue ◽  
Retarding Effect ◽  
Condensation Polymers ◽  
Thermal Stability Of ◽  
Sem Investigation

Copolymer of p-phenylenediamine and bispirocyclic pentaerythritol diphosphate was synthesized and characterized by FTIR and 1H NMR. This polymer was used to prepare epoxy resin/SPDA composites. Thermal stability of SPDA and epoxy/SPDA composites were investigated by thermogravimetric analysis (TGA), and their flammability were investigated by the LOI test. TGA results showed that the addition of SPDA improved the char residue of epoxy resin. SEM investigation showed that the residual chars have a honeycomb-like structure, indicating an intumescent flame retarding effect of SPDA in composites. In addition, all of above results confirmed that accelerate carbonization play a key role in improving flame retardancy of epoxy resin.

scholarly journals Synthesis and characterization of kraft lignin-based epoxy resins

BioResources ◽  
2011 ◽  
Vol 6 (3) ◽  
pp. 2492-2503
Author(s):  
Nour-Eddine El Mansouri ◽  
Qiaolong Yuan ◽  
Farong Huang
Keyword(s):  
Thermal Stability ◽  
Epoxy Resins ◽  
1H Nmr Spectroscopy ◽  
Kraft Lignin ◽  
Synthesis And Characterization ◽  
Index Test ◽  
Optimal Conditions ◽  
Application Potential ◽  
Thermal Stability Of

Epoxidization is an interesting way to develop a new application of lignin and therefore to improve its application potential. In this work, kraft lignin-based epoxy resins were obtained by the epoxidization reaction, using the kraft lignin recovered directly from pulping liquor and modified by a methylolation reaction. The methylolated lignins were obtained by the reaction of original kraft lignin with formaldehyde and glyoxal, which is a less volatile and less toxic aldehyde. 1H-NMR spectroscopy showed that methylolated kraft lignin has more hydroxymethyl groups than glyoxalated kraft lignin. For the epoxidization reaction we studied the influence of the lignin:NaOH (w/w) ratio, temperature, and time of the reaction on the properties of the prepared epoxidized lignins. The structures of lignin-based epoxy resins were followed by epoxy index test and FTIR spectroscopy. Optimal conditions were obtained for lignin-based epoxy resin produced at lignin/NaOH = 1/3 at 70 ºC for 3h. Thermogravimetry analysis (TGA) revealed that the epoxidization enhances the thermal stability of lignins and may allow a wider temperature range for applications with lignin epoxy-PF blends.

Thermal stability of microencapsulated epoxy resins with poly(urea–formaldehyde)

2006 ◽  
Vol 91 (10) ◽  
pp. 2300-2306 ◽  
Author(s):  
Li Yuan ◽  
Guo-Zheng Liang ◽  
Jian-Qiang Xie ◽  
Jing Guo ◽  
Lan Li
Keyword(s):  
Thermal Stability ◽  
Epoxy Resins ◽  
Urea Formaldehyde ◽  
Thermal Stability Of

Kinetic Analysis of UV-Curable Epoxy Resins for Micromachining Applications

2009 ◽  
Vol 74 ◽  
pp. 299-302 ◽  
Author(s):  
Voytekunas Vanda Yu ◽  
Ng Feng Lin ◽  
Koh Chai Ling ◽  
Abadie Marc
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Epoxy Resins ◽  
High Performance ◽  
Moisture Absorption ◽  
Scanning Calorimetry ◽  
Uv Curable ◽  
Mechanical And Electrical Properties ◽  
Multifunctional Epoxy Resin ◽  
Thermal Stability Of

Multifunctional epoxy resin series Epiclon HP-7200 is classified under the high performance series and is well known for its application in electrical encapsulation as it exhibits excellent mechanical and electrical properties. In addition, they have an advantage of an ultra low moisture absorption compared to other conventional cresol novolac (ECN) and biphenyl epoxy resins, which potentially makes it the next new mainstream of epoxy resins in electronics application. In this paper, kinetic study of various concentration of Epiclon HP-7200 (40-70 wt %) with divinyl ether (DVE) as the reactive solvent has been performed by Photo-Differential Scanning Calorimetry (DPC). The thermal stability of the Epiclon HP-7200 solutions has been analyzed by DSC and TGA.

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