Preparation and properties of halogen‐free flame‐retarded phthalonitrile–epoxy blends |
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| Authors: | Xin Zhao Yajie Lei Rui Zhao Jiachun Zhong Xiaobo Liu |
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| Affiliation: | Research Branch of Advanced Functional Materials, Institute of Microelectronic and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China |
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| Abstract: | Halogen‐free flame‐retarded blends composed of 2,2‐bis4‐(3,4‐dicyanophenoxy) phenyl] propane (BAPh) and epoxy resin E‐44 (EP) were successfully prepared with 4,4′‐diaminodiphenyl sulfone as a curing additive. The structure of the copolymers was characterized by Fourier transform infrared spectroscopy, which showed that epoxy groups, a phthalocyanine ring, and a triazine ring existed. The limiting oxygen index values were over 30, and the UL‐94 rating reached V‐0 for the 20 : 80 (w/w) BAPh/EP copolymers. Differential scanning calorimetry and dynamic rheological analysis were employed to study the curing reaction behaviors of the phthalonitrile/epoxy blends. Also, the gelation time was shortened to 3 min when the prepolymerization temperature was 190°C. Thermogravimetric analysis showed that the thermal decomposition of the phthalonitrile/epoxy copolymers significantly improved with increasing BAPh content. The flexible strength of the 20:80 copolymers reached 149.5 MPa, which enhanced by 40 MPa compared to pure EP. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
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| Keywords: | blends flame retardance polymer blends thermal properties |
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