@Article{jrm.2022.018754,
AUTHOR = {Daqin Zhang, Chufeng Yang, Huayang Ran, Juanli Wang, Jintao Wan, Yuhu Li, Pujun Jin, Daodao Hu},
TITLE = {A New DOPO-Eugenol Adduct as an Effective Flame Retardant for Epoxy Thermosets with Improved Mechanical Properties},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {10},
YEAR = {2022},
NUMBER = {7},
PAGES = {1797--1811},
URL = {http://www.techscience.com/jrm/v10n7/46952},
ISSN = {2164-6341},
ABSTRACT = {The development of efficient green flame retardants is an important way to realize more sustainable epoxy
thermosets and downstream materials. In this work, a monoepoxide is synthesized through O-glycidylation of
eugenol, and then reacted with DOPO (9,10-dihydro-9-oxa-10-phosphophenanthrene-10-oxide) to obtain a
new bio-based flame retardant, DOPO-GE. DOPO-GE is blended with a bisphenol A epoxy prepolymer exhibiting good compatibility and DDS (4,4′-diaminodiphenylsulfone) is used as the curing agent to afford epoxy thermosets. Although DOPO-GE leads to the reduced glass transition temperature of the thermosets, the storage
modulus increases considerably. The DOPO-GE-modified thermosets exhibit the high thermal stability with
the onset thermal decomposition temperature in nitrogen and air exceeding 300°C. When the phosphorus content in the thermoset is 1.0%, the residual yield of the thermosets at 750°C in nitrogen increases from 13.9% to
30.6%, due to the increased charring ability. More interestingly, when the phosphorus content is only 0.5%, the
limiting oxygen index is as high as 30.3% with UL94 V0 achieved. Cone calorimeter results reveals the signifi-
cantly decreased heat release rate, total heat release, mass loss and total smoke production. Furthermore,
DOPO-GE can notably improve the flexural strength, flexural modulus and fracture toughness, whereas the shear
and impact strength are reduced to varied extents. In short, DOPO-GE can be obtained via a facile way, and
shows the good flame-retardant effect on the epoxy thermosets with an application potential.},
DOI = {10.32604/jrm.2022.018754}
}