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Epoxy/Nanosilica Organic-inorganic Hybrid Materials-Effect of Functional Group of POSS
Hou-Hsein Chu,Yu-Ling Chen,Bei-Huw Shen,Kuang Sein Chuang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
Epoxy (EP) was mixed and cured with either 1.0, 3.0, 5.0 or 8.0 parts of one polyhedral oligomeric silsesquioxanes(POSS) per hundred parts of epoxy resin, using ethylene diamine as cure agent. Each system was precured at 80 °C for 1 hand last cured at 170 °C for 1 h, and an appropriate temperature programing was set to ensure that the temperature rise wasnot too fast to avoid possible poor diffusions. Four POSSs used are glycidyl POSS (G-POSS), aminopropyl isobutyl POSS(A-POSS), PEG POSS (P-POSS), and trisilanol isobutyl POSS (T-POSS). Bearing hard aggregate particles in hybridcomposites was found for (EP/T-POSS) and (EP/A-POSS) (both reflected by the pencil hardness), and the tensile strengthvalues were ranked as the first and third, respectively. The (EP/P-POSS) system was ranked the second in tensile strength,where both (EP/P-POSS) and (EP/G-POSS) have uniform distribution of POSS with little aggregation in epoxy matrix. Notethat G-POSS was expected to form extensive networks with epoxy, since it has abundant glycidyl groups. The extensivenetwork formation was found to increase Tg with increasing the G-POSS content. The TGA results were nicely compiledwith the use of integral procedural decomposition temperature.