Abstract
An economical flame retardant additive dimelamine pyrophosphate (DMPY) was synthesized from melamine and sodium pyrophosphate and its chemical structure was well characterized and confirmed. It was used to flame retardant epoxy resin (EP) thermosets and the fire retarded performance, mechanical properties, moisture resistance and flame retardant mechanism of EP thermosets were investigated in details. The samples achieved UL-94 V-0 grade during vertical burning tests and the limiting oxygen index value reached 28.7% when 9 wt% DMPY was incorporated. DMPY stimulated the degradation of EP matrix in advance and the formation of intumescent and compact char layer during combustion. Besides, the nonflammable gases generated from the decomposition of DMPY exerted flame retarded effect in gas phase. Thus, the rate and total amount of heat release and smoke production were significantly suppressed. The moisture resistance of EP/DMPY thermosets was improved comparing with that of pure EP. The samples remained superior flame retardant performance and mechanical properties after water resistance tests due to the excellent water resistance of DMPY. In summary, the EP/DMPY thermosets exhibited excellent flame retardancy, moisture resistance, mechanical properties and fire safety performance. The presented investigation provided a broad application prospect in the high-performance field of flame retardant EP thermosets because of the low cost and easy industrialization of DMPY.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
