Phd thesis on polyaniline

Phd thesis on polyaniline

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SHAYAN MEHRAEEN Materials Science and Nano EngineeringPhD Dissertation Thesis Jury. Selmiye Alkan Gürsel Thesis AdvisorAssoc. Fevzi Çakmak Cebeci Co-AdvisorProf. Melih Papila Co-AdvisorAssoc. Gözde İnce, Assoc. Güllü Kızıltaş Şendur, Prof. Alimet Sema Özen, Assoc. Ebru Menşur Alkoy. Place: SUNUM G Keywords : polyaniline nanofiber, actuation stroke, bending actuator, gel electrolyte, p oly vinylidene fluoridephd thesis on polyaniline, poly styrene sulfonic acidPVDF- g -PSSA, IPMC, radiation-induced graft polymerization.

In this thesis, two actuation systems based on two different conductive polymers were designed, prepared and characterized. In the first part, polyaniline nanofibers were used as main actuation component. Polyaniline nanofibers have shown promising electrical and electrochemical properties which make them prominent candidates in the development of smart systems employing sensors and actuators. Their electrochemical actuation potential is demonstrated in this study.

A trilayer composite actuator based on polyaniline nanofibers was designed and fabricated. Cross-linked polyvinyl alcohol was sandwiched between two polyaniline nanofibrous electrodes as ion-containing electrolyte gel. First, electrochemical behavior of a single electrode was studied, showing reversible redox peak pairs in 1 M HCl using a cyclic voltammetry technique, phd thesis on polyaniline.

High aspect ratio polyaniline nanofibers create a porous network phd thesis on polyaniline facilitates ion diffusion and thus accelerates redox reactions. Bending displacement of the prepared trilayer actuator was then tested and reported under an AC potential stimulation as low as 0. The decay of performance of the composite actuator in the air is investigated and it is reported that tip displacement in a solution was stable and repeatable for s in all selected frequencies.

In the second part of the thesis, 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, phd thesis on polyaniline.

The material system is well known for the proton exchange membranes of fuel cells, phd thesis on polyaniline, however, its IPMC application is novel. Flexible, soft and porous membranes were prepared by simple solution casting technique.

Physical, mechanical, thermal and actuation properties of prepared membranes were characterized and compared with Nafion®. The membrane with highest graft level showed comparable ion exchange capacity phd thesis on polyaniline proton conductivity with that of Nafion whereas its water uptake is near three-fold greater than Nafion. To make PVDF- g -PSSA based Phd thesis on polyaniline 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. The results revealed that the PVDF- g -PSSA membrane with highest graft level showed highest average bending strain at 0. 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.

PhD Dissertation: SHAYAN MEHRAEEN.

Zhicheng Ji PhD thesis defense

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