Dielectric and acoustic properties of bacterial cellulose designed for application in loudspeakers

• Autorzy: Markiewicz E. , Pawlaczyk C. , Hilczer B.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, September, 15-17, 2004, Wrocław
• Języki publikacji: EN

Abstrakty

EN

The dielectric relaxation in the biocellulose modified by chitosan, chitosan acetate and chitosan lactate was studied in the frequency range from 100 Hz to 1 MHz in the temperature range 100 to 450 K. Three dielectric relaxations were found and assigned to the corresponding orientational processes on the molecular level: at -200 K - the local main chain motion, at ~ 330 K - an orientational motion in a mixed phase of polysaccharide and water and above 400 K - the ion migration. The electroacoustic parameters of the loudspeakers with the membranes made of biocellulose modified by chitosan and its derivatives were measured in anechoic conditions. The correlation between the dielectric response of studied polymers and the electroacoustic parameters of loudspeakers was stated.

Słowa kluczowe

EN

dielectric relaxation; biocellulose; chitosan; loudspeaker parameters

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 257--261
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Markiewicz E.

• Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland

autor

Pawlaczyk C.

• Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland

autor

Hilczer B.

• Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland

Bibliografia

• [1] MARKIEWICZ E., HILCZER B., PAWLACZYK CZ., Dielectric and acoustic response of biocellulose, Ferroelectrics, work accepted for printing.
• [2] EINFELDT J., MEISSNER D., KWASNIEWSKI A., Polymerdynamics of cellulose and other polysaccharides in solid stale-secondary dielectric relaxation processes, Progr. Polym. Sci., Vol. 26 (2001). pp. 1419-1472.
• [3] BARANOV A.I., ANISIMOVA V.N., KHRIPUNOV A.K., BAKLAGINA Y.U., Dielectric properties and dipole glass transition in cellulose Acetobacter Xylinium, Ferroelectrics, Vol. 286 (2003), pp. 141-151.
• [4] KAKIZAKI M., HIDESHIMA T., Dielectric relax spectroscopy of chitin and related substances in advances in chitin and chitosan, Elsevier, Amsterdam. 1992. p. 165.
• [5] GLASSTONE S., LAIDLER K.J., EYRING H., Theory of rate processes, McGraw-Hill, New York, 1941.
• [6] MEISSNER D., EINFELDT J., KWASNIEWSKI A., Contributions to the molecular origin of the dielectric relaxation processes in polysaccharides - the low temperature range, J. Non-Cryst. Solids, Vol. 275 (2000), pp. 199-209.