Polyvinylidene ﬂuoride grafted poly(styrene sulfonic acid) as ionic polymer-metal composite actuator
Mehraeen, Shayan and Sadeghi, Sahl and Cebeci, Fevzi Çakmak and Papila, Melih and Alkan Gürsel, Selmiye (2018) Polyvinylidene ﬂuoride grafted poly(styrene sulfonic acid) as ionic polymer-metal composite actuator. Sensors and Actuators A: Physical, 279 . pp. 157-167. ISSN 0924-4247
Official URL: http://dx.doi.org/10.1016/j.sna.2018.05.038
A high performance ionic polymer-metal composite actuator (IPMC) based on proton conductivity of poly(styrene sulfonic acid) was fabricated using a simple and novel method. Poly(styrene sulfonic acid) (PSSA) as a well-known hydrophilic proton conductive functional group was radiation grafted on polyvinylidene ﬂuoride (PVDF) at different graft levels. The material system is well known for the pro-ton exchange membranes of fuel cells, however, its IPMC application is novel. Flexible, soft and porous membranes were prepared by simple solution casting technique. Physical, mechanical, thermal and actu-ation properties of prepared membranes were characterized and compared with Naﬁon® . The membrane with highest graft level showed comparable ion exchange capacity and proton conductivity with that of Naﬁon whereas its water uptake is near three-fold greater than Naﬁon. To make PVDF-g-PSSA based IPMC actuators, Pt particles were deposited on both sides of the membranes using electroless plating method. Actuation performance of the IPMC actuators under various AC potentials and different frequencies were investigated in air. The results revealed that the PVDF-g-PSSA membrane with highest graft level showed highest average bending strain at 0.1 Hz and 4 V. The enhanced bending actuation behavior was attributed to porous morphology and large water uptake of graft polymerized actuators. Compared with traditional Naﬁon-based IPMC, our bending actuator is cheaper, and its preparation is fast and simple. So, it can be a viable replacement candidate for the traditional Naﬁon in soft actuator systems.
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