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ANALYSIS OF LATTICE THERMAL CONDUCTIVITY OF AMORPHOUS POLYMER AT LOW TEMPERATURES: APPLICATION TO POLYMETHYL METHACRYLATE AND POLYSTYRENE.

Author(s) : HASEN A. K., MISHO R. H., DUBEY K. S.

Type of article: Article

Summary

THE LATTICE THERMAL CONDUCTIVITY (K) OF AMORPHOUS POLYMER AT LOW TEMPERATURES HAS BEEN ANALYZED BY EXPRESSING ITS TOTAL LATTICE THERMAL CONDUCTIVITY AS A SUM OF THE THREE CONTRIBUTIONS AS A + B + C WHERE A IS THE CONTRIBUTION DUE TO THOSE PHONONS WHICH CAN INTERACT WITH CRYSTAL BOUNDARIES, B TO THOSE PHONONS WHICH HAVE FREQUENCIES LESS THAN THE PLATEAU FREQUENCY AND C TO THOSE PHONONS WHICH HAVE LARGER FREQUENCIES. THE STUDY HAS BEEN MADE FOR POLYMETHYL METHACRYLATE AND POLYSTYRENE IN THE TEMPERATURE RANGE 0.1-4 K. A VERY GOOD AGREEMENT HAS BEEN OBTAINED BETWEEN EXPERIMENTAL AND CALCULATED VALUES OF K AT LOW TEMPERATURES. IT HAS ALSO BEEN FOUND THAT AT LOW TEMPERATURES, THE TOTAL K OF A NONCRYSTALLINE POLYMER IS MAINLY DUE TO THE CONTRIBUTION B.

Details

  • Original title: ANALYSIS OF LATTICE THERMAL CONDUCTIVITY OF AMORPHOUS POLYMER AT LOW TEMPERATURES: APPLICATION TO POLYMETHYL METHACRYLATE AND POLYSTYRENE.
  • Record ID : 1983-1233
  • Languages: English
  • Source: Indian J. pure appl. Phys. - vol. 20 - n. 6
  • Publication date: 1982/06
  • Document available for consultation in the library of the IIR headquarters only.

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