Dynamic mechanical properties of poly(p-phenyleneterephthalamide) fiber

✍ Scribed by Toshio Kunugi; Hideaki Watanabe; Minoru Hashimoto

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 912 KB
• Volume: 24
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1979.070240417

✦ Synopsis

The dynamic mechanical properties of poly@-phenyleneterephthalamide) fiber were investigated.

Measurements of the dynamic mechanical properties were carried out on samples of low crystallinity and low orientation over a temperature range from -100 to +50O0C at a frequency of 110 Hz, at a heating rate of SoC/rnin. Five relaxation processes were revealed a t -30,60,170, 27OoC, and in the vicinity of 46OoC, respectively. The prominent dispersion peaks located at -30,60, and 46OOC were termed the 7 , p, and a relaxations, respectively. The two weak peaks at 170 and 27OoC, observed in annealed samples, seem to correspond to the p-relaxations reported previously by Frosini et al. and Takayanagi et al. The effect of annealing on the behavior of these dispersion peaks was examined, and possible molecular interpretation of these relaxation processes are made.