Premium
Techniques for the evaluation of the drawing behavior of experimental fibers
Author(s) -
Tregonning K.,
Dyson E.
Publication year - 1972
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1972.070160805
Subject(s) - materials science , composite material , degree (music) , modulus , ultimate tensile strength , fiber , polymer , synthetic fiber , physics , acoustics
Equipment and techniques are described which have been developed for determining the drawing behavior of fibers from novel polymers which are available only in very small quantities. Emphasis is placed upon information obtained from the stress–strain diagrams of the fibers during drawing. A parameter, the reinforcement factor, is described which reflects the degree of orientation induced by drawing short lengths of fiber in a discontinuous manner. This parameter exhibits maxima at various combinations of temperature and draw rate, and the relationship between the corresponding temperatures and draw rates is shown to be logarithmic. The parameter is used to predict temperatures and draw rates which will give fibers having a high degree of orientation and good tensile properties when drawn continuously. The application of these techniques to give acceptable fibers from poly( m ‐phenylene adamantane‐1,3‐dicarboxamide) is described. This material is of interest as one possessing a high degree of thermal stability, and the best fibers produced to date have a tenacity of 4.0 g per denier, an initial modulus of 60 g per denier, and a break extension of 16.0%.