Thermal degradation and flame retardance of epoxy resins containing a microencapsulated flame retardant

2012 ◽  
Vol 18 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Ming Gao ◽  
Weihong Wu ◽  
Fachao Wu
Keyword(s):  
Thermal Degradation ◽  
Flame Retardant ◽  
Epoxy Resins ◽  
Flame Retardance

Thermal Stabilities and the Thermal Degradation Kinetics Study of the Flame Retardant Epoxy Resins

2014 ◽  
Vol 1053 ◽  
pp. 263-267 ◽  
Author(s):  
Xiu Juan Tian
Keyword(s):  
Thermal Stability ◽  
Thermal Degradation ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Degradation Kinetics ◽  
Thermal Degradation Kinetics ◽  
Thermal Stabilities ◽  
Degradation Kinetic ◽  
Modified Epoxy

Thermal stability and thermal degradation kinetics of epoxy resins with 2-(Diphenylphosphinyl)-1, 4-benzenediol were investegated by thermogravimetric analysis (TGA) at different heating rates of 5 K/min, 10 K/min, 20 K/min and 40 K/min. The thermal degradation kinetic mechanism and models of the modified epoxy resins were determined by Coast Redfern method.The results showed that epoxy resins modified with the flame retardant had more thermal stability than pure epoxy resin. The solid-state decomposition mechanism of epoxy resin and the modified epoxy resin corresponded to the controlled decelerating ځ˽̈́˰̵̳͂͆ͅ˼˰̴̱̾˰̸̵̈́˰̵̸̳̱̹̽̾̓̽˰̶̳̹̾̈́̿̾̓ͅ˰̶˸ځ˹˰̵̵͇͂˰̃˸́˽ځ˹2/3. The introduction of phosphorus-containing flame retardant reduced thermal degradation rate of epoxy resins in the primary stage, and promote the formation of carbon layer.

The Effect of Intumescent Flame Retardant Contained Microencapsulated Red Phosphorus on the Flame Retardance and Thermal Degradation Behaviour of Epoxy Resin

2011 ◽  
Vol 197-198 ◽  
pp. 1167-1170
Author(s):  
Zhi Ping Wu ◽  
Yun Chu Hu ◽  
Mei Qin Chen
Keyword(s):  
Activation Energy ◽  
Thermal Degradation ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Flame Retardants ◽  
Degradation Process ◽  
Intumescent Flame Retardant ◽  
Flame Retardance ◽  
Red Phosphorus ◽  
Degradation Behaviour

The effect of intumescent flame retardant (IFR) contained microencapsulated red phosphorus on the flame retardance of E-44 epoxy resin (EP) was studied. The test results indicated that good flame retardancy can be realized when epoxy resin treated with 30% IFR. Thermogravimetric analysis showed that the charring amount at high temperature of EP can increase substantially when IFR was incorporated. In order to further explain this phenomenon, Dolye integration method of thermal degradation dynamics was employed to study the thermal degradation process of EP treated with IFR based on the microencapsulated red phosphrous according to the thermal gravimetry analysis results.The activation energy and reactor order of different thermal degradation stages were obtained. The results of thermal degradation dynamics implied the intumescent flame retardants can improve the flame retardance of the epoxy resin through decrease the degradation speed and increase the activation energy of the second thermal degradation stage.

Thermal Degradation Kinetics of a Intumescent Flame Retardant System for Halogen-Free Flame Retarded EVA

2012 ◽  
Vol 550-553 ◽  
pp. 2767-2772
Author(s):  
Xiu Yun Li ◽  
De Tian Liao ◽  
Han Bing Ma ◽  
Kang Lin Xu ◽  
An Bin Tang
Keyword(s):  
Thermal Degradation ◽  
Flame Retardant ◽  
Degradation Kinetics ◽  
Thermo Gravimetric Analysis ◽  
Intumescent Flame Retardant ◽  
Thermal Degradation Kinetics ◽  
Flame Retardance ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Limiting Oxygen Index

An intumescent flame retardant (IFR) system containing phosphorus-silicon (EMPZR) and ammonium polyphosphate (APP) was used to improve the flame retardancy of poly(ethylene-co-vinyl acetate)(EVA). The influence of EMPZR contents on the flame retardance of EVA/EMPZR/APP composites has been studied. It was found that the reasonable mass ratio of EMPZR/APP in EVA/EMPZR/APP composites is 20/20, whose limiting oxygen index (LOI) value was improved from 19.0 for EVA to 28.6, and the burning grading reached to UL-94 V-0. The thermal behavior of EVA and IFR-EVA was investigated by dynamic thermo gravimetric analysis (TGA) at different heating rates and then the thermal degradation activation energies of EVA and IFR-EVA were determined by using Flynn-Wall-Ozawa method. Meanwhile, morphology of the char residue obtained from burning IFR-EVA in LOI test was studied through the scanning electron microscopy SEM observation, the rich compact char layer in which could explain the good flame retardance and the synergistic effect between EMPZR and APP.

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