TY - JOUR
T1 - Flame retardant epoxy composites with epoxy-containing polyhedral oligomeric silsesquioxanes
AU - Liu, Leichun
AU - Zhang, Wenchao
AU - Yang, Rongjie
N1 - Publisher Copyright:
© 2020 John Wiley & Sons Ltd
PY - 2020/9/1
Y1 - 2020/9/1
N2 - A kind of polyhedral oligomeric silsesquioxanes (POSS) containing the propoxyl-epoxy and phenyl groups (pr-ep-Ph-POSS) was synthesized via hydrolytic condensation reaction. Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry identified the structure of the pr-ep-Ph-POSS, including major caged Si6O9 (T6), Si10O15 (T10), Si12O18 (T12), etc. The pr-ep-Ph-POSS was applied into the epoxy resin to achieve EP/pr-ep-Ph-POSS composites. Thermogravimetric analysis indicated that EP/pr-ep-Ph-POSS showed excellent thermal properties than pure EP. The fire behaviors of EP/pr-ep-Ph-POSS composites were evaluated based on the cone calorimetry, limiting oxygen index (LOI), UL-94 vertical burning test, and smoke density test. The smoke density decreased by ~30%, the LOI value reached to 26.4%, dripping was inhibited, and the peak of heat release rate decreased by ~62%. X-ray photoelectron spectroscopy analysis and FTIR indicated that protective-barrier effect is the main flame-retardant mode of action for pr-ep-Ph-POSS, due to the formation of the Si-O-Si, Si-O-C, and Si-C condensed phase, which improve the thermal stability, strength, and integrity of the char layer.
AB - A kind of polyhedral oligomeric silsesquioxanes (POSS) containing the propoxyl-epoxy and phenyl groups (pr-ep-Ph-POSS) was synthesized via hydrolytic condensation reaction. Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry identified the structure of the pr-ep-Ph-POSS, including major caged Si6O9 (T6), Si10O15 (T10), Si12O18 (T12), etc. The pr-ep-Ph-POSS was applied into the epoxy resin to achieve EP/pr-ep-Ph-POSS composites. Thermogravimetric analysis indicated that EP/pr-ep-Ph-POSS showed excellent thermal properties than pure EP. The fire behaviors of EP/pr-ep-Ph-POSS composites were evaluated based on the cone calorimetry, limiting oxygen index (LOI), UL-94 vertical burning test, and smoke density test. The smoke density decreased by ~30%, the LOI value reached to 26.4%, dripping was inhibited, and the peak of heat release rate decreased by ~62%. X-ray photoelectron spectroscopy analysis and FTIR indicated that protective-barrier effect is the main flame-retardant mode of action for pr-ep-Ph-POSS, due to the formation of the Si-O-Si, Si-O-C, and Si-C condensed phase, which improve the thermal stability, strength, and integrity of the char layer.
KW - POSS
KW - epoxy resin
KW - flame retardancy
UR - http://www.scopus.com/inward/record.url?scp=85085073751&partnerID=8YFLogxK
U2 - 10.1002/pat.4929
DO - 10.1002/pat.4929
M3 - Article
AN - SCOPUS:85085073751
SN - 1042-7147
VL - 31
SP - 2058
EP - 2074
JO - Polymers for Advanced Technologies
JF - Polymers for Advanced Technologies
IS - 9
ER -