Accession Number : AD0707319

Title :   ACOUSTIC PROPERTIES OF A POLYMETACARBORANESILOXANE.

Descriptive Note : Rept. for Sep 68-Jul 69,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Hartmann,Bruce ; Jarzynski,Jacek

Report Date : 02 MAR 1970

Pagination or Media Count : 32

Abstract : Speed of sound and absorption measurements were made on a polymetacarboranesiloxane in the temperature range from -50C to +50C and the frequency range from 92 kHz to 650 kHz. Measurements were also done on isotactic polypropylene to check out the experimental method. For polypropylene at room temperature, the measured speed of sound was 2500 m/sec, in satisfactory agreement with literature values. For the carborane at room temperature, the measured speed of sound was 1400 m/sec, typical for a rubber. Contrary to most polymers (including polypropylene), however, the slope of the sound speed vs. temperature is greater below the glass transition (-20 m/sec/C) than it is above the glass transition (-7 m/sec/C). (Author)

Descriptors :   (*INORGANIC POLYMERS, ACOUSTIC PROPERTIES), BORANES, SILANES, ULTRASONIC RADIATION

Subject Categories : Plastics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE