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18 April 2023 Shape recovery performance of UV-aged polymer (Conference Presentation)
Midhan Siwakoti, Russell W. Mailen
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Proceedings Volume PC12484, Behavior and Mechanics of Multifunctional Materials XVII; PC1248409 (2023) https://doi.org/10.1117/12.2658389
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States
Abstract
Space represents a harsh environment for all materials. This is particularly challenging for shape memory polymers (SMPs), which show significant potential for lightweight actuators for deployable space structures. Relevant conditions include UV radiation, temperature variations, and vacuum. Polymers, when exposed to such environment for prolonged period (aging), begin to break down structurally and thermodynamic properties, such as enthalpy, entropy, and specific volume, change over time. This leads to permanent modification of mechanical properties such as decreased strength and increased brittleness of the polymer. The shape recovery performance of shape memory polymer is dependent on its thermodynamic properties and energy associated with UV aging can be evaluated through a differential scanning calorimetry (DSC) test. Previous studies focus on the effects of UV exposure on chemical degradation of polymers. However, limited research has been conducted towards studying shape recovery performance of UV aged polymer through thermomechanical prestrain followed by shape recovery process. In this study, we expose SMPs in a UV environment followed by shape recovery experiments where they are prestrained and recovered at various thermomechanical conditions such as recovery temperature, strain rate and aging time. Furthermore, we use characterization techniques such as FTIR and SEM to evaluate the amount of physical degradation of SMP as a result of UV aging process. The results obtained from this study will provide insight into recovery capabilities of a SMP for space exploration.
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© (2023) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Midhan Siwakoti and Russell W. Mailen "Shape recovery performance of UV-aged polymer (Conference Presentation)", Proc. SPIE PC12484, Behavior and Mechanics of Multifunctional Materials XVII, PC1248409 (18 April 2023); https://doi.org/10.1117/12.2658389
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KEYWORDS
Ultraviolet radiation
Polymers
Shape memory polymers
Thermodynamics
Actuators
Calorimetry
Chemical analysis
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