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Open AccessArticle

Synthesis of Highly Thermally Stable Daidzein-Based Main-Chain-Type Benzoxazine Resins

Research School of Polymeric Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
Department of Chemistry, University of Leicester, Leicester LE1 7RH, UK
Author to whom correspondence should be addressed.
Polymers 2019, 11(8), 1341;
Received: 2 July 2019 / Revised: 7 August 2019 / Accepted: 7 August 2019 / Published: 13 August 2019
(This article belongs to the Collection Sustainable Polymeric Materials from Renewable Resources)
In recent years, main-chain-type benzoxazine resins have been extensively investigated due to their excellent comprehensive properties for many potential applications. In this work, two new types of main-chain benzoxazine polymers were synthesized from daidzein, aromatic/aliphatic diamine, and paraformaldehyde. Unlike the approaches used synthesizing traditional main-chain-type benzoxazine polymers, the precursors derived from daidzein can undergo a further cross-linking polymerization in addition to the ring-opening polymerization of the oxazine ring. The structures of the new polymers were then studied by 1H nuclear magnetic resonance spectroscopy (NMR) and Fourier-transform infrared spectroscopy (FT-IR), and the molecular weights were determined by using gel permeation chromatography (GPC). We also monitored the polymerization process by differential scanning calorimetry (DSC) and in situ FT-IR. In addition, the thermal stability and flame-retardant properties of the resulting polybenzoxazines were investigated using TGA and microscale combustion calorimeter (MCC). The polybenzoxazines obtained in this study exhibited a very high thermal stability and low flammability, with a Tg value greater than 400 °C, and a heat release capacity (HRC) value lower than 30 J/(g K). View Full-Text
Keywords: benzoxazine; daidzein; high thermal stability; polybenzoxazine benzoxazine; daidzein; high thermal stability; polybenzoxazine
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MDPI and ACS Style

Han, M.; You, S.; Wang, Y.; Zhang, K.; Yang, S. Synthesis of Highly Thermally Stable Daidzein-Based Main-Chain-Type Benzoxazine Resins. Polymers 2019, 11, 1341.

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