Imide-DOPO derivative endows epoxy resin with excellent flame retardancy and fluorescence without losing glass transition temperature. (1st February 2022)

• Record Type: Journal Article
• Authors: He, Lei; Chen, Tao; Zhang, Yi; Hu, Lianrui; Wang, Ting; Han, Rui; He, Jia-Lin; Luo, Wei; Liu, Zhi-Guo; Deng, Jin-Ni; Chen, Ming-Jun
• Is Part Of: Composites. Number 230(2022)
• Publication Date: 2022-02-01
• Subjects: Epoxy resin -- Flame retardancy -- DOPO -- Glass transition temperature -- Fluorescence; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2021.109553
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: The aggregation and plasticizing of most 9, 10-dihydro-9-oxa-10-phosphaphenanthrene −10-oxide (DOPO) derived additives often result in deteriorating the glass transition temperature and mechanical properties of epoxy resins (EP). To address this issue, an imide-DOPO derivative (BMP) with bulky aromatic structure was successfully synthesized. Benefitting from the space hindering and intermolecular interaction (π-π stacking) of BMP, it does not lead to the loss of glass transition temperature, and only a minor damage of tensile and impact strengths is caused. Additionally, with only 0.78 wt% loading of phosphorus (10 wt% BMP), the EP/BMP10% achieves UL-94 V-0 and high LOI value of 35%. Simultaneously, both the heat release rate and total smoke production are markedly reduced. More excitingly, BMP exhibits aggregation-induced emission enhancement of fluorescence in the N, N -dimethylformamide/water mixed solution as well as epoxy resin. This work provides a new insight in simultaneously imparting flame retardancy and fluorescence to epoxy resins without losing glass transition temperature. Graphical abstract: Image 1 Highlights: Imide-DOPO derivative exhibits aggregation-induced emission enhancement. Imide-DOPO derivative endows epoxy resin with excellent flame retardancy. No loss of Tg while the improvement of flame retardancy. Fluorescence is imparted to the flame retardant epoxy resin.