Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 127, Issue 2, Pages 1419-1430Publisher
SPRINGER
DOI: 10.1007/s10973-016-5456-0
Keywords
Reactive phosphorus-containing epoxy monomer; Renewable diphenolic acid; Thermal property; Flame retardancy; Fire behavior
Funding
- Jiangsu Province Natural Science Foundation of China [BK20130071]
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In this work, renewable diphenolic acid was used to prepare reactive phosphorus-containing epoxy monomer (PCDGEDP) and its chemical structure was characterized by FTIR, H-1-NMR and P-31-NMR spectra. Subsequently, PCDGEDP was reacted with diaminodiphenylmethane (DDM) to obtain phosphorus-containing PCDGEDP/DDM thermoset. The performances of corresponding thermoset in terms of thermal stability, mechanical property, combustion performance and fire behavior have been investigated in detail. It is worth noting that phosphorus-containing PCDGEDP/DDM thermoset showed high glass transition temperature (127 A degrees C), good thermal stability with high mass residue (16.1 % at 700 A degrees C) as well as good mechanical properties. Meanwhile, phosphorus-containing PCDGEDP/DDM thermoset exhibited improved flame retardant property with UL-94V-0 grade and high LOI value (29.6 %). Moreover, incorporating reactive phosphorus-containing epoxy monomer PCDGEDP into epoxy network can significantly decrease the heat release rate, total heat release, smoke produce rate, total smoke release and therefore enhance the fire safety of epoxy thermoset during combustion. It is implying that incorporating rigid phenyldiphosphate structure into epoxy molecular backbone can impart flame retardancy and smoke suppression properties to epoxy thermoset. It is tightly related to its higher phosphorus content (3.3 %) and higher mass residue (18.53 %) of phosphorus-containing PCDGEDP/DDM thermoset.
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