4.6 Article

A Bridge-Linked Phosphorus-Containing Flame Retardant for Endowing Vinyl Ester Resin with Low Fire Hazard

期刊

MOLECULES
卷 27, 期 24, 页码 -

出版社

MDPI
DOI: 10.3390/molecules27248783

关键词

vinyl ester resin; flame retardant; thermal stability; mechanism analysis

资金

  1. Natural Science Research Project of Anhui Province [KJ2020A0450]
  2. Natural Science Research Foundation for Introduction of Talent and Doctor [2019QDZ59]

向作者/读者索取更多资源

A new phosphorus-based flame retardant PBDOO was synthesized and incorporated with VE to improve its flame retardancy and thermal stability. The VE/PBDOO composites showed UL-94 V-0 rating and reduced peak heat release rate and total heat release. The flame retardant mechanism of PBDOO was proposed based on pyrolysis behavior and residual carbon analysis of the composites.
The high flammability of vinyl ester resin (VE) significantly limits its widespread application in the fields of electronics and aerospace. A new phosphorus-based flame retardant 6,6'-(1-phenylethane-1,2 diyl) bis (dibenzo[c,e][1,2]oxaphosphinine 6-oxide) (PBDOO), was synthesized using 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and acetophenone. The synthesized PBDOO was further incorporated with VE to form the VE/PBDOO composites, which displayed an improved flame retardancy with higher thermal stability. The structure of PBDOO was investigated using Fourier transformed infrared spectrometry (FTIR) and nuclear magnetic resonances (NMR). The thermal stability and flame retardancy of VE/PBDOO composites were investigated by thermogravimetric analysis (TGA), vertical burn test (UL-94), limiting oxygen index (LOI), and cone calorimetry. The impacts of PBDOO weight percentage (wt%) on the flame-retardant properties of the formed VE/PBDOO composites were also examined. When applying 15 wt% PBDOO, the formed VE composites can meet the UL-94 V-0 rating with a high LOI value of 31.5%. The peak heat release rate (PHRR) and the total heat release (THR) of VE loaded 15 wt% of PBDOO decreased by 76.71% and 40.63%, respectively, compared with that of untreated VE. In addition, the flame-retardant mechanism of PBDOO was proposed by analyzing pyrolysis behavior and residual carbon of VE/PBDOO composites. This work is expected to provide an efficient method to enhance the fire safety of VE.

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