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A comparative study of the thermal discharge behaviour of cellulose diacetate and cellulose triacetate films (1994)

Naidu, Y. R. Vidyadhar ; Sagar, D. S. ; Sharma, A. K.

New York, NY [u.a.] : Wiley-Blackwell

Polymer International 34 (1994), S. 379-385

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ISSN: 0959-8103

Keywords: cellulose diacetate ; cellulose triacetate ; polymer electret ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The thermal discharge behaviour of cellulose diacetate (CA2) (39% acetyl content) and cellulose triacetate (CA3) (44% acetyl content) films was studied at different polarizing temperatures and fields. Cellulose diacetate exhibited two peaks, one at low temperatures and the other at high temperatures, whereas cellulose triacetate exhibited only one peak. The origin of these peaks in CA2 is attributed to dipolar orientation and space charge polarization respectively, while the only peak in CA3 is due to space charge polarization. The difference in thermal discharge behaviour of CA2 and CA3 is attributed to the difference in acetyl contents of the two acetates.

Additional Material: 8 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pi.1994.210340405

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Pyroelectric currents in undoped and Fe-doped polystyrene films (1991)

Sharma, A. K. ; Sagar, D. S.

Weinheim : Wiley-Blackwell

Acta Polymerica 42 (1991), S. 599-601

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ISSN: 0323-7648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Description / Table of Contents: Das pyroelektrische Verhalten von undotierten und mit Fe3+ dotierten Polystyrenfilmen wurde bei unterschiedlichen Polarisierungsfeldstärken, Polarisierungstemperaturen und Dotierungskonzentrationen untersucht. Die pyroelektrischen Ströme waren durchweg positiv. Mit steigender Konzentration, Feldstärke und Temperatur der Polarisierung nahmen sie signifikant zu. Der Ursprung der beobachteten Pyroelektrizität wurde der Raumladungspolarisation zugeschrieben.

Notes: The pyroelectric behaviour of undoped and Fe3+ doped polystyrene films was studied at different polarizing fields, polarizing temperatures, and doping concentrations. The pyroelectric currents were positive throughout and showed a significant increase with increasing dopant concentration, polarizing field and temperature. The origin of pyroelectricity has been attributed to space charge polarization.

Additional Material: 5 Ill.