Influence of suspension preparation condition and medium microstructure and phase of electrophoretic deposited poly (vinylidene fluoride) films

Rohizat, Nursyafika (2015) Influence of suspension preparation condition and medium microstructure and phase of electrophoretic deposited poly (vinylidene fluoride) films. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This thesis is about the characterization of PVDF (Polyvinylidene Fluoride) film of piezoelectric applications in order to solve the crack problem due to weak bonding between deposited PVDF particles. The objective of this experiment is to characterize PVDF suspensions and PVDF films prepared by different polymer solvents (MEK (Methyl Ethyl Ketone) and DMF (Dimethyl Formamide)), stirring temperatures and time. The method used to deposit the PVDF particles on the ITO glass is electrophoretic deposition. Sedimentation test shows PVDF prepared in DMF based suspension have higher stability when compared with MEK sample. Low surface roughness was shown by UV-vis Spectra and SEM in PVDF films prepared using DMF based suspension. PVDF films prepared using MEK based suspension have a very rough and uneven surface films as compared to DMF derived sample. PVDF film prepared in DMF based suspension (at 120˚C, 8 hr stirring condition) has even and low surface roughness, although did not have fully coverage film area. EDS analysis is used in 120˚C, 2 hr and 120˚C, 8 hr stirring condition that prepared in DMF based suspension show PVDF film coverage area is 60.4% for for 120˚C, 8 hr sample. FTIR results show PVDF films prepared in DMF based suspension contain β-phase alone, while in MEK contain α and β-phase. Therefore, the best parameter of PVDF film is at 120˚C, 8 hr stirring condition prepared in DMF based suspension because it has the most even films’ surface compared to other samples.

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