TY - GEN
T1 - Multiscale characterization of water-, oil- and UV-conditioned shape-memory polymer under compression
AU - Fulcher, J. T.
AU - Karaca, H. E.
AU - Tandon, G. P.
AU - Foster, D. C.
AU - Lu, Y. C.
PY - 2011
Y1 - 2011
N2 - Shape memory polymers (SMPs) are an emerging class of active polymers that may be used for reconfigurable structures on air vehicles. In this study, epoxy-based SMPs were conditioned separately in simulated service environments relevant to Air Force missions, namely, (1) exposure to UV radiation, (2) immersion in jet-oil, and (3) immersion in water. The mechanical properties and shape recovery abilities of the unconditioned and conditioned SMPs were examined using large-scale compressive tests and small-scale nano-indentation tests. Results show that all the conditioned SMPs exhibit a decrease in Tg as compared to the unconditioned one. Under compressive loading, the SMPs undergo significant plastic deformation prior to fracture, except the UV conditioned sample. Environmentally conditionings generally result in higher moduli and yield strength of the SMPs. Environmental conditionings, in particular the UV exposure and water immersion, also affect the shape recovery abilities of the SMPs if the recovery temperatures are set low.
AB - Shape memory polymers (SMPs) are an emerging class of active polymers that may be used for reconfigurable structures on air vehicles. In this study, epoxy-based SMPs were conditioned separately in simulated service environments relevant to Air Force missions, namely, (1) exposure to UV radiation, (2) immersion in jet-oil, and (3) immersion in water. The mechanical properties and shape recovery abilities of the unconditioned and conditioned SMPs were examined using large-scale compressive tests and small-scale nano-indentation tests. Results show that all the conditioned SMPs exhibit a decrease in Tg as compared to the unconditioned one. Under compressive loading, the SMPs undergo significant plastic deformation prior to fracture, except the UV conditioned sample. Environmentally conditionings generally result in higher moduli and yield strength of the SMPs. Environmental conditionings, in particular the UV exposure and water immersion, also affect the shape recovery abilities of the SMPs if the recovery temperatures are set low.
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U2 - 10.1007/978-1-4614-0213-8_14
DO - 10.1007/978-1-4614-0213-8_14
M3 - Conference contribution
AN - SCOPUS:84863293805
SN - 9781461402121
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 97
EP - 103
BT - Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2011 Annual Conference on Experimental and Applied Mechanics
T2 - 2011 SEM Annual Conference on Experimental and Applied Mechanics
Y2 - 13 June 2011 through 16 June 2011
ER -