The contrastive study of chemical treatment on the properties of hydrophobic PVDF membrane
Abstract
In this study, polyvinylidene fluoride (PVDF) flat membranes were treated with potassium hydroxide (KOH), sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl). The effects of temperature, treatment duration and chemical concentration towards the properties of PVDF membrane were contrastively studied. Following treatment, membrane became much brittle with a reduced nominal elongation to as low as 61%. Temperature elevation and prolonged treatment time accelerated the chemical reaction with PVDF as shown by further decline in the membrane stability. Nevertheless, the treatment conditions employed in this study are considered too mild for the dehydrofluorination process to occur. FTIR analysis indicated no carbon-carbon double bond formation and DSC analysis showed insignificant changes in the melting temperature. All treated membrane was observed to have larger pore size as a result of stretching on surface structure. Comparatively, acquired results showed that NaOCl has the most detrimental impact on the PVDF membrane stability, followed by NaOH and KOH.References
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