Effect of gas‐condensed phase synergistic system of 9, 10‐dihydro‐9‐oxo‐10‐phosphaphenanthrene‐10‐oxide and polydopamine on flame retardancy of epoxy resin. Issue 3 (29th July 2020)

• Record Type: Journal Article
• Authors: Xu, Yao; Sun, Jinhao; Qian, Lijun; Li, Juan
• Is Part Of: Journal of applied polymer science. Volume 138:Issue 3(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-07-29
• Subjects: degradation -- flame retardance -- thermogravimetric analysis; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.49698
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: Polydopamine (PDA) was prepared by using dopamine which has good charring ability. The PDA was used as an environmentally friendly flame retardant and combined with 9, 10‐dihydro‐9‐oxo‐10‐phosphaphenanthrene‐10‐oxide (DOPO) to improve the flame retardancy of epoxy (EP) resin. The flame retardancy and thermal stability of EP composites were researched by UL‐94 vertical burning, limiting oxygen index (LOI), cone calorimetry tests, and thermal gravimetric analyzer. Adding DOPO alone requires 6% to make EP obtain the UL‐94 V0. If DOPO and PDA are combined, only 4% is needed to make EP obtain the UL‐94 V0, which suggests that there is good synergistic effect between them. Moreover, the peak of heat release rate of EP/DOPO/PDA composites is less than that of EP/DOPO composites. The reactions among EP, DOPO, and PDA reduce the release of combustible gases at the early stage of degradation; at the same time, DOPO volatilize to the gas phase, quench the free radicals, and the combustion can be stopped. In addition, due to the decrease of the amount of PDA/DOPO, the EP composite can get a higher glass transition temperature, but due to the aggregation of PDA in EP, the tensile property of EP composite decreases. Abstract :