抄録
We observated mechanical character of Commercial Polycaproamide for elongation of the outest laver, which is twisted at constant length. The results are as the following.:
1. The breaking twist (i.e. elongation of outest layer of twisted filament) does not increase linearly with log (rate of extension, ) but shows its maximum when the range of the rate of extension is increased several hundred folds. The observed maximum values are 0.008% extension per second at 60°C, 0.175 at 100°C, 0.2% at 120°C.
2. At the usual load-elongation curve of the same samples, there exist also maximum of elongation in the above range of extension.
The value are 7.9% at 60°C 13.8% at 100°C.
These maximum values may be the resultant the relaxation time of the recrystallisation of microcrystalls, followed by tearing rupture by twists.
3. Notwithstanding different values of the breaking elongation of twisted filaments, their calculated elongation of outest layer shows the same value independent of the number of their twist.
