Open AccessCorrelation between silane concentration and temperature operated toward conductivity of well-synthesized chitosan-fly ash composite membrane
Author(s) -
Arief Rahmatulloh,
Lukman Atmadja
Publication year - 2021
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc201118043r
Subject(s) - silane , membrane , materials science , fly ash , chitosan , composite number , chemical engineering , fourier transform infrared spectroscopy , conductivity , electrolyte , composite material , polymer chemistry , chemistry , biochemistry , electrode , engineering
Composite membrane is synthesized using well-synthesized chitosan as matrix crosslink with fly ash as filler and modified using 3-glicydyloxypropyltrimetoxy silane coupling agent. XRD analysis is carried out to characterize fly ash. While, FTIR characterization is conducted to determine the interaction between chitosan matrix and fly ash that has been modified using silane. The emergence of a new absorption at wave numbers 1118.64 cm-1 shows the interaction between silane and fly ash. In addition, the widening of OH absorption shows that hydrogen bonds are formed between the silane and chitosan. The interaction is also demonstrated by the evenly distributed hills and valleys on AFM topography analysis. Characterizing the composite membrane with TGA analysis is done to determine thermal stability. While, proton conductivity of the composite membranes are measured using EIS. The highest conductivity values are obtained with the addition of 5 % silane concentration of 2.75?10-4 S cm-1 at room temperature, 3.995?10-4 S cm-1 at 40 ?C, and 3.909?10-4 S cm-1 at 60 ?C. On the contrary, measurements at 80 ?C, decomposition in all composite membranes occur. Thus, the crosslinked composite membrane chitosan?fly ash prepared by silane-crosslinking technique has potential to be applied with polymer electrolyte membrane fuel cell (PEMFC).