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W., Endang Asijati
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POLIMERISASI o-TOLUIDIN DALAM FASA AQUEOUS DAN PENGEMBANGANNYA UNTUK MEMBUAT FILM POLI-o-TOLUIDIN SECARA in situ W., Endang Asijati; Susanto, Dieky; Tockary, Theofilus A; Sabarinah, Yanti
Makara Journal of Science Vol. 10, No. 1
Publisher : UI Scholars Hub

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O-toluidine Polymerization in Aqueous Phase and Its Development to Produce In Situ Poly-o-toluidine Films. Polymerization parameters of aqueous phase which have an effect to polymer film were studied in order to establish indirect control of film fabrication by means of controlling the parameters of aqueous phase. Among the parameters studied are the concentration of HCl, APS/o-toluidine ratio, polymerization duration, and temperature. HCl concentration was found to be optimum at the excess value of 1.0M, whereas ratio of APS/o-toluidine at 1.25. Polymerization duration was found of having an effect to both stability and thickness. As a rule, longer duration of polymerization leads to a thicker and more stablized polymer film. Temperature was found to be a parameter that have a defining role in the control of film thickness. Despite of the rather semi quantitative nature of the data, the results show a clear indication that indirect control is possible for in situ method of o-toluidin film fabrication.
PENGARUH KONDISI POLIMERISASI TERHADAP SIFAT-SIFAT OPTIS FILM POLI o-TOLUIDIN SEBAGAI SENSOR pH W., Endang Asijati; Susanto, Dieky; Tockary, Theofilus A; Sabarinah, Yanti
Makara Journal of Science Vol. 10, No. 1
Publisher : UI Scholars Hub

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The Influence of Polymerization Condition to Optical Properties of Poly-o-toludine Films for PH Sensor Application. Properties of poly-o-toludine film strongly bonded to non polar substrate was studied for application as optical pH sensor. Characterization of film in various pH value is carried out by recording absorbance curve using uv-visible spectrophotometer. All poly-o-toluidine film was then found to be applicable as optical pH sensor in the pH range of 2.0- 6.0. Further computational processing by means of curve fitting into logaritmic trend will allow expansion of measurement to the pH range of 2.0-8.0. Sensitivity of pH response was highest in poly-o-toluidine film fabricate at HCl 1.0 M and at 12 hours of dipping time. This paper also studied hysteresis effect in pH response. It was concluded that poly-o-toluidine salt exposed to basic pH will not be easily regenerated. For this reason, poly-o-toluidine film will only be suitable for single usage of pH measurement.
Co-Authors Susanto, Dieky Tockary, Theofilus A Yanti Sabarinah