Journal
PROGRESS IN ORGANIC COATINGS
Volume 110, Issue -, Pages 195-203Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2017.01.012
Keywords
Myrcene; Castor oil; Epoxy curing agent; Organophosphorus; Flame retardant; Mechanical property balance
Funding
- Basal Special Research Fund Project of Chinese Academy of Forestry [CAFINT2014C08]
- National Five-year Science and Technology Support Project [2015BAD15B04]
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Two bio-based organophosphorus-containing epoxy curing agents (MMDOPO and MAPDGR) with different rigid or flexible characteristics were synthesized from myrcene and castor oil, respectively. Their molecular structures were characterized by Fourier transform infrared spectroscopy (FTIR), H-1 and P-31 nuclear magnetic resonance ((HNMR)-H-1). Then they were mixed at different weight ratios to form new curing agents for epoxy resin (E-51). Results show the tensile and flexural strength of the cured epoxy materials first increase and then decrease with the increase of MMDOPO content. Dynamic mechanical analysis (DMA) shows the glass transition temperature (T-g) rises significantly with the increase of MMDOPO content. The material's thermal stability and flame retardant properties were also investigated. The initial decomposition temperature (T-i) and limiting oxygen index (LOI) both are elevated while the residue decreases with the increase of MMDOPO content. When the MMDOPO/MAPDGR weight ratio is 25/75, the mechanical properties are relatively balanced with a high elongation at break of 160.8% and a moderate tensile strength of 9.95 MPa, and bending test indicates that the sample exhibits a flexible failure behavior with a yielding point. (C) 2017 Elsevier B.V. All rights reserved.
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