Preparation and properties of flame retardant epoxy resin modified by additive nitrogen-containing POSS-based molecule with eight DOPO units

Octa-N-phenylaminopropyl-POSS (Octa-NAPA-POSS), DOPO and paraformaldehyde were used to synthesize Octa-DOPO-POSS through the Kabachnik-Fields reaction. It was added into epoxy resin with different ratio to prepare a series of modified epoxy resin composites. The results proved that the addition of f...

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Bibliographic Details
Published in:Journal of polymer research 2021-05, Vol.28 (5), Article 195
Main Authors: Hu, Rong, He, Kaibin, Zheng, Xianghong, Zeng, Birong, Chen, Guorong, Xu, Yiting, Yuan, Conghui, Luo, Weiang, Dai, Lizong
Format: Article
Language:English
Subjects:
Char formation
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Composite materials
Elongation
Epoxy resins
Flame retardants
High temperature
Industrial Chemistry/Chemical Engineering
Mechanical properties
Modulus of rupture in bending
Moisture resistance
Nitrogen
Original Paper
Polymer Sciences
Pyrolysis
Rapid prototyping
Thermodynamic properties
Weight loss
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Summary:Octa-N-phenylaminopropyl-POSS (Octa-NAPA-POSS), DOPO and paraformaldehyde were used to synthesize Octa-DOPO-POSS through the Kabachnik-Fields reaction. It was added into epoxy resin with different ratio to prepare a series of modified epoxy resin composites. The results proved that the addition of flame retardant Octa-DOPO-POSS significantly improved the thermal property, flame retardant performance and moisture resistance of epoxy resin without weakening the mechanical properties. When the addition amount of Octa-DOPO-POSS was 5 wt%, the LOI value of the cured EP/Octa-DOPO-POSS composite increased to 33.9%. Its UL-94 level reached V-0 rating, and the THR and PHRR were significantly reduced. Meanwhile, the flexural modulus and breaking elongation were improved. Moreover, as the adding amount increased the residual char yield of EP/Octa-DOPO-POSS composites also increased, while the maximum thermal weight loss rate gradually decreased. The real-time FTIR and SEM analysis of the char residue after high temperature pyrolysis proved that Octa-DOPO-POSS could promote the char formation and produce a denser char layer. Overall, the combination of POSS and DOPO at a molecular level rather than physical mixing has a positive and significant effect on the flame retardancy of epoxy resin.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-021-02553-7