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Open AccessArticle

A Study of the Curing and Flammability Properties of Bisphenol A Epoxy Diacrylate Resin Utilizing a Novel Flame Retardant Monomer, bis[di-acryloyloxyethyl]-p-tert-butyl-phenyl Phosphate

Institute of Organic and Polymeric Materials, National Taipei University of Technology, #1, Sec 3, Chung-Hsiao E. Rd, Taipei 10608, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: De-Yi Wang
Materials 2017, 10(2), 202; https://doi.org/10.3390/ma10020202
Received: 8 December 2016 / Revised: 12 February 2017 / Accepted: 13 February 2017 / Published: 20 February 2017
(This article belongs to the Special Issue Flame Retardant Polymeric Materials)
A UV-curable, flame-retardant monomer, DAPP (bis[di-acryloyloxyethyl]-p-tert-butyl-phenyl-phosphate), was synthesized based on BPDCP (4-tert-butylphenyl-dichloro phosphate) and HEA (2-hydroxy ethyl acrylate). DAPP was blended with regular bisphenol A epoxy acrylate (BAEA) in various ratios to yield various phosphorus contents. The TGA-IR (thermogravimetric analyzer interface with an infrared spectrometer) results demonstrate that compounding 30 mol % DAPP with BAEA significantly reduced the amount of released CO gas. In contrast, the peak intensity of CO2 is independent of phosphorus content. The limiting oxygen index (LOI), reaching the saturated value of 26, and the heat release rate (HRR) measured using a cone-calorimeter, 156.43 KW/m2, confirm the saturation point when 30 mol % DAPP was compounded into BAEA. A study of the kinetics of pyrolysis reveals that Ea decreases as the phosphorus content increases. Both the TGA-IR and pyrolysis results reveal that the phosphorus compound DAPP is easily decomposed during the initial stage of burning to form an insulating layer, which inhibits further burning of the resin and the consequent release of other flammable gases. View Full-Text
Keywords: DAPP (bis[di-acryloyloxyethyl]-p-tert-butyl-phenyl phosphate); BPDCP (4-tert-butylphenyl dichlorophosphate); kinetics of pyrolysis DAPP (bis[di-acryloyloxyethyl]-p-tert-butyl-phenyl phosphate); BPDCP (4-tert-butylphenyl dichlorophosphate); kinetics of pyrolysis
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Rwei, S.-P.; Chen, Y.-M.; Chiang, W.-Y.; Ting, Y.-T. A Study of the Curing and Flammability Properties of Bisphenol A Epoxy Diacrylate Resin Utilizing a Novel Flame Retardant Monomer, bis[di-acryloyloxyethyl]-p-tert-butyl-phenyl Phosphate. Materials 2017, 10, 202.

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