A vanillin‐containing DOPO‐based compound for improving the flame retardancy of epoxy resin simultaneously with comparable transparency and mechanical property

A compound containing phosphorus/nitrogen/sulfur (named as DOVNPT) was synthesized by the reaction of p‐toluenesulfonamide, vanillin and 9,10‐dihydro‐9‐oxo‐10‐phosphophenanthrene‐10‐oxide, and was adopted to prepare flame retardant epoxy resins (FREPs) using 4,4‐diaminodiphenylmethane as the curing...

Full description

Saved in:
Bibliographic Details
Published inJournal of applied polymer science Vol. 140; no. 9
Main Authors Lu, Jiayi, Chen, Liping, Luo, Zhonglin, Wang, Biaobing
Format Journal Article
LanguageEnglish
Published Hoboken, USA John Wiley & Sons, Inc 05.03.2023
Wiley Subscription Services, Inc
Subjects
Chemical synthesis
Curing agents
Decomposition
Enthalpy
epoxy resin
Epoxy resins
Fire resistance
flame retardancy
Flame retardants
Heat release rate
Materials science
Mechanical properties
mechanical property
mechanism
Methylene dianiline
NMR
Nuclear magnetic resonance
Phosphorus
Polymers
Pyrolysis
Thermal stability
transparency
Vanillin
Vapor phases
Online AccessGet full text
ISSN0021-8995
1097-4628
DOI10.1002/app.53556

Cover

More Information
Summary:A compound containing phosphorus/nitrogen/sulfur (named as DOVNPT) was synthesized by the reaction of p‐toluenesulfonamide, vanillin and 9,10‐dihydro‐9‐oxo‐10‐phosphophenanthrene‐10‐oxide, and was adopted to prepare flame retardant epoxy resins (FREPs) using 4,4‐diaminodiphenylmethane as the curing agent. The chemical structure of DOVNPT was verified using Fourier‐transform infrared spectroscopy, 1H and 31P nuclear magnetic resonance. The influence of the DOVNPT content on the thermal stability, fire performance, combustion behaviors, transparency and mechanical properties of the FREPs was investigated in detail. The DOVNPT promoted the decomposition of EP on advance whilst lowered the maximum decomposition rate. With the incorporation of 4 wt% DOVNPT (0.49 wt% phosphorus content), the FREP‐4 achieved a LOI value of 34.4% and a UL‐94 V‐0 rating. The FREP‐4 also gave the lowest peak heat release rate, total heat release and total smoke release, with a reduction of 40.4%, 24.8%, and 28.6% as compared with the pure EP, respectively. The comprehensive analysis of the char residues and gaseous pyrolysis products demonstrated that the DOVPNT displayed good flame retardant effect in both gas phase and condensed phase. Simultaneously, the FREPs presented a comparable transparency and slightly improved mechanical properties as compared with the pure EP.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0021-8995
1097-4628
DOI:10.1002/app.53556