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Abstrak :
ABSTRAK
Polianilin telah disintesis melalui polimerisasi oksidatif kimia dengan Ammonium Peroksidisulfat APS sebagai inisiator dalam berbagai konsentrasi 50 g/L, 100 g/L dan 200 g/L . Polimerisasi anilin berjalan dengan ditandai adanya kenaikan temperatur karena reaksi yang terjadi dalam larutan mencapai temperatur tertinggi sebesar 42 C pada larutan dengan konsentrasi APS 200 g/l. Hasil dari reaksi polimerisasi oksidatif berupa basa emeraldin PANi-EB . Struktur PANi dikonfirmasi dengan FTIR ditandai dengan adanya vibrasi stretching pada cincin benzenoid dan quinoid pada bilangan gelombang 1400-1500 cm-1. Sifat konduktif PANi diperoleh melalui pemberian protonasi menggunakan asam kuat yaitu HCl dan HClO4. Nilai konduktivitas PANi-EB mengalami peningkatan 102 kali setelah doping menggunakan HCl dan 106 kali pasca doping HClO4. Semua PANi hasil sintesis memiliki kemampuan penyerapan gelombang elektromagnetik pada rentang frekuensi 10 GHz-15 GHz. Semakin tinggi nilai resistivitas PANi yaitu makin rendah nilai konduktivitas, semakin tinggi juga nilai reflection loss RL . Nilai RL tertinggi sekitar -18 dB pada frekuensi 12,5 GHz dan 14,3 GHz diperoleh dari PANi-EB hasil polimerasi dengan konsentrasi APS sebesar 200 g/l.

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ABSTRAK
Polianiline has been synthesized by chemical oxidative polymerization using Ammonium Polyaniline has been synthesized through chemical oxidative polymerization with Ammonium Peroxidisulfate APS as an initiator in various concentrations 50 g l, 100 g l and 200 g l . The polymerization reactions of aniline are characterized by an increase in temperature due to the reaction occurring in the solution, reaching the highest temperature of 42 C in a solution with APS concentration of 200 g l. Result of oxidative polymerization reaction is the emeraldine base polyaniline or PANi EB. The PANi formation was confirmed by FTIR which characterized by stretching vibrations in benzenoid and quinoid rings at wave numbers 1400 1500 cm 1 respectively. The conductive property of PANi was obtained through doping by a protonation using strong acids HCl and HClO4. It was found that conductivity value PANi EB increased 102 times after doping with HCl and 106 times after doping with HClO4. Moreover, all synthesized PANi has the ability to absorb electromagnetic waves in the frequency range 10 GHz 15 GHz. The higher the resistivity value of PANi that is the lower the conductivity value, the higher the reflection loss RL . The highest RL values of about 18 dB at 12.5 GHz and 14.3 GHz frequencies were obtained from PANi EB polymeration results with APS concentrations of 200 g l.

Abstrak :
ABSTRAK
Polianilin telah berhasil dibuat melalui proses polimerisasi oksidatif kimia dengan berbagai laju reaksi polimerisasi masing-masing 3 ml / menit, 2 ml / menit dan 1 ml / menit. PANi dikarakterisasi menggunakan FTIR, PSA, konduktivitas listrik dengan four point probe dan vector network analyzer, VNA pada jangkau frekuensi 8-15 GHz. Reaksi polimerisasi anilin ditandai dengan kenaikan temperatur reaksi yang terjadi dalam larutan, mencapai temperatur tertinggi 42 C dalam larutan dengan laju reaksi tertinggi. Hasil dari reaksi polimerisasi oksidatif adalah polianilin emeraldin basa atau PANi-EB. Pembentukan PANi dikonfirmasi oleh FTIR yang ditandai dengan meregangkan getaran pada cincin benzenoid dan quinoid pada bilangan gelombang 1033 cm-1?1144 cm-1. Ukuran partikel yang diperoleh masih dalam skala mikro sekitar 0,597-5,238 ?m. Sifat konduktif PANi diperoleh melalui doping dengan protonasi menggunakan asam kuat HCl dan HClO4. Ditemukan bahwa nilai konduktivitas PANi-EB meningkat 102 kali setelah doping dengan HCl dan 106 kali setelah doping dengan HClO4. Nilai konduktivitas listrik PANi yang paling tinggi diperoleh pada PANi diprotonasi dengan HClO4 dengan nilai 337-363 mS/cm. Selain itu, semua PANi yang disintesis memiliki dielektrik dan memiliki kemampuan menyerap gelombang elektromagnetik pada rentang frekuensi 10 GHz-15 GHz. Ditemukan bahwa semakin tinggi nilai resistivitas PANi atau semakin rendah nilai konduktivitasnya, semakin tinggi pula nilai reflection loss RL . Nilai RL tertinggi sekitar -12,6 dB dan - 14,4 dB masing-masing pada frekuensi10,4 GHz dan pada 12,5 GHz yang diperoleh dari PANi-EB dihasilkan dari polimerisasi dengan laju reaksi terendah.

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ABSTRAK
Polyaniline has been successfully fabricated through the chemical oxidative polymerization process with various polymerization reaction rate respectively 3 ml min., 2 ml min and 1 ml min. PANi were characterized using FTIR, PSA, conductivity by four point probe and VNA with frequency 8 15 GHz. The polymerization reactions of aniline was characterized by an increase in temperature due to the reaction occurring in the solution, reaching the highest temperature of 42 C in a solution of the highest reaction rate. Result of oxidative polymerization reaction is the emeraldine base polyaniline or PANi EB. The PANi formation was confirmed by FTIR which characterized by stretching vibrations in benzenoid and quinoid rings at wave number 1033 cm 1 1144 cm 1. The particle size is still in micro scale is 0.597 5.238 m. The conductive property of PANi was obtained through doping by a protonation using strong acids HCl and HClO4. It was found that conductivity value PANi EB increased 102 times after doping with HCl and 106 times after doping with HClO4. The highest electrical conductivity of PANi was obtained in HClO4 doped PANi with a value of 337 363 mS cm. in addition to this, all synthesized PANi has characteristics of dielectric materials able to absorb the electromagnetic waves in the frequency range 10 GHz 15 GHz. It is found that the higher the resistivity value of PANi or the lower the conductivity value, the higher the reflection loss RL . The highest RL values of about 12.6 dB and ndash 14.4 dB respectively at 10.4 GHz and at 12.5 GHz obtained from PANi EB resulted from polymerization with the lowest reaction rate.