State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
wxcmx@ustc.edu.cn (X.W.)
yuanhu@ustc.edu.cn (Y.H.)
收稿:2021-12-02,
修回:2022-4-6,
录用:2022-4-25,
网络首发:2022-07-21,
纸质出版:2022-10-01
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Nabipour, H.; Wang, X.; Song, L.; Hu, Y. Intrinsically anti-flammable apigenin-derived epoxy thermosets with high glass transition temperature and mechanical strength. Chinese J. Polym. Sci. 2022, 40, 1259–1268
Hafezeh Nabipour, Xin Wang, Lei Song, et al. Intrinsically Anti-Flammable Apigenin-derived Epoxy Thermosets with High Glass Transition Temperature and Mechanical Strength[J]. Chinese Journal of Polymer Science, 2022, 40(10): 1259-1268.
Nabipour, H.; Wang, X.; Song, L.; Hu, Y. Intrinsically anti-flammable apigenin-derived epoxy thermosets with high glass transition temperature and mechanical strength. Chinese J. Polym. Sci. 2022, 40, 1259–1268 DOI: 10.1007/s10118-022-2779-0.
Hafezeh Nabipour, Xin Wang, Lei Song, et al. Intrinsically Anti-Flammable Apigenin-derived Epoxy Thermosets with High Glass Transition Temperature and Mechanical Strength[J]. Chinese Journal of Polymer Science, 2022, 40(10): 1259-1268. DOI: 10.1007/s10118-022-2779-0.
An apigenin-derived epoxy monomer (DGEA) was synthesized. The cured DGEA thermoset showed an ultrahigh
T
g
of 232 °C and exceptional antiflammability with a UL-94 V-0 grade
whereas the cured petroleum-based diglycidyl ether of bisphenol A (DGEBA) thermoset behaved high flammability and a relatively low
T
g
(156 °C).
In this work
apigenin was chosen as a raw material to synthesize a novel epoxy monomer (DGEA)
while the bio-based epoxy resin was further obtained after curing with 4
4’-diaminodiphenylmethane (DDM). The control samples were prepared by curing diglycidyl ether of bisphenol A (DGEBA) with DDM. The non-isothermal differential scanning calorimeter (DSC) method was utilized to further investigate the curing behavior and curing kinetics of the DGEA/DDM system. Despite no flame retardant active elements
the DGEA/DDM thermoset still exhibited exceptional anti-flammability. Specifically
the DGEA/DDM thermoset reached a V-0 rating in the UL-94 test and owned a high limiting oxygen index (LOI) value of 37.0%
while DGEBA/DDM resins were consumed completely in the vertical combustion test with a low LOI of 23.0%. Furthermore
the microscale combustion calorimetry (MCC) results manifested that compared with DGEBA/DDM resins
both PHRR and THR values of the DGEA/DDM resins were dropped by 84.0% and 57.6%
respectively. Additionally
the DGEA/DDM resin also presented higher storage modulus and tensile strength compared with DGEBA/DDM one. Particularly
in contrast with that of the cured DGEBA/DDM one (156 °C)
the DGEA/DDM thermoset displayed an extremely high glass transition temperature (232 °C). This study breaks new ground on how to produce bio-based monomers with aromatic structures and achieve high-performance thermosetting polymers.
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