Synthesis and properties of polycyclic phosphonate resins using one-pot method under ultrasound irradiation |
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Authors: | Shuanjin Wang Jing Xu Yuanyuan Liu Min Xiao Yuezhong Meng |
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Affiliation: | (1) The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510275, People’s Republic of China;(2) College of Chemistry and Material Science, Shandong Agriculture University, Taian, 271018, People’s Republic of China; |
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Abstract: | Novel polycyclic phosphonates were first synthesized from novolac phenol formaldehyde (PF) resins under ultrasound irradiation
in the absence of phase transfer catalyst (PTC). Experimental results demonstrated that ultrasound can accelerate the cycle
condensation of the novolac PF resin in good yield. The chemical structure of the synthesized polycyclics was characterized
using Gel-permeation chromatography (GPC), Fourier transfer infrared (FTIR), 1H- and 31P-nuclear magnetic resonance (NMR). Thermal properties of these polycyclics were determined by TG/IR analysis. The results
showed that the induced cyclical phosphonate resins can greatly inhibit the oxidative weight loss of the polycyclic phosphonates,
leading to very high char yields at temperatures higher than 700 °C. The char yields remained still about 4 wt.% while the
weight remaining of phosphonate-free phenol formaldehyde (PF) resin was almost 0% at 600 °C. This indicates that the synthesized
polycyclic phosphonates could be the potential candidates as a flame retardant for the polymers such as polycarbonate, epoxy
resin and poly(ethylene terephthalate) etc. |
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