Shape memory behaviour of PMMA-coated NiTi alloy under thermal cycle

0561755 - FZÚ 2023 RIV CH eng J - Journal Article
Samal, Sneha Manjaree - Kosjaková, O. - Vokoun, David - Stachiv, Ivo
Shape memory behaviour of PMMA-coated NiTi alloy under thermal cycle.
Polymers. Roč. 14, č. 14 (2022), č. článku 2932. E-ISSN 2073-4360
R&D Projects: GA ČR(CZ) GC21-12994J; GA ČR(CZ) GC22-14387J; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : curvature * radius * shape recovery * NiTi * PMMA * thermal cycles
OECD category: Materials engineering
Impact factor: 5, year: 2022
Method of publishing: Open access

Both poly(methyl methacrylate) (PMMA) and NiTi possess shape memory and biocompatibility behavior. The macroscale properties of PMMA–NiTi composites depend immensely on the quality of the interaction between two components. NiTi shape memory alloy (SMA) and superelastic (SE) sheets were spin coated on one side with PMMA. The composite was prepared by the spin coating method with an alloy-to-polymer-thickness ratio of 1:3. The bending stiffness and radius of curvature were calculated by using numerical and experimental methods during thermal cycles. The experimental radius curvatures in actuation have good agreement with the model. The change in shape results from the difference in coefficients of thermal expansion between PMMA and NiTi. Actuation temperatures were between 0 and 100 °C for the SMA–PMMA composite with a change in curvature from 10 to 120 mm with fixed Young’s modulus of PMMA at 3 GPa, and a change in Young’s modulus of NiTi from 30 to 70 GPa. PMMA–NiTi composites are useful as actuators and sensor elements.
Permanent Link: https://hdl.handle.net/11104/0334274