A positron annihilation study of the tensile behaviour of bivoltine silk fibers

Ramgopal, G. and Ramani, R. and Ramachandra, P. and Shariff, G. and Thimmegowda, M. C. and Ranganathaiah, C. (1999) A positron annihilation study of the tensile behaviour of bivoltine silk fibers. EUROPEAN POLYMER JOURNAL, 35 (6). pp. 1107-1113.

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Official URL: http://dx.doi.org/10.1016/S0014-3057(98)00080-9

Abstract

The influence of longitudinal stress on the microstructure of bivoltine silk fibers has been investigated by the Positron Lifetime Technique (PLT). The variation of o-Ps (orthopositronium atom) pick-off lifetime and intensity as a function of stress (0-240 kPa) reveals that the free volume size and its number density remains unchanged within the elastic limit (60 kPa). Thereafter, the free volume size decreases from 67 to 57 Angstrom(3). Owing to the loose helix structure, the chain alignment in the crystalline regions starts prior to that in the amorphous regions, leading to a more ordered silk-II type. The estimated low activation energy in the disordered regions suggests a folded chain conformation for the more ordered silk-II type. (C) 1999 Elsevier Science Ltd. All rights reserved.

Item Type: Article
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Users 13 not found.
Date Deposited: 19 Apr 2013 09:14
Last Modified: 02 Jul 2013 05:51
URI: http://eprints.uni-mysore.ac.in/id/eprint/4932

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