A new approach to prepare flame retardant epoxy resin with excellent transmittance, mechanical properties, and anti-aging performance by the incorporation of DOPO derivative

• Published in: Polymer degradation and stability Vol. 218; p. 110579
• Main Authors: He, Yifang, Cui, Xinyu, Liu, Zhishuo, Lan, Fujie, Sun, Jun, Li, Hongfei, Gu, Xiaoyu, Zhang, Sheng
• Format: Journal Article
• Language: English
• Published: 01.12.2023
• Subjects: calorimetry; degradation; epoxides; flame retardants; heat; oxygen; polymers; smoke; transmittance
• ISSN: 0141-3910
• DOI: 10.1016/j.polymdegradstab.2023.110579

Aiming to develop high performance flame-retardant epoxy resin (EP), a novel phosphorus-containing flame retardant named 6-(3-(2-hydroxyphenyl)propyl)dibenzo-[1,2]oxaphosphinine 6-oxide (HP-DOPO) was synthesized and employed as a multi-functional additive for EP with simultaneously excellent flame retardancy, transmittance, mechanical enhancement and anti-aging. With 5 wt.% loading of HP-DOPO, EP composites showed outstanding flame retardancy with a high limiting oxygen index of 35.6 % and V-0 rating in UL-94 test, while the cone calorimetric test results demonstrated that HP-DOPO could efficiently restrain the heat and smoke release. Compared with pure EP, the resultant EP/5 %HP-DOPO exhibited superior mechanical properties with 27.9 % and 56.2 % increase in tensile and impact strengths, respectively. Furthermore, HP-DOPO accelerated the curing procedure and did not sacrifice the transparency of cured EP, while anti-aging performance was obtained at the same time. The exploration of this novel multi-functional additive provided a powerful basis for the technologies and potential industrial applications of epoxy materials.