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Moreover, it seems that increasing the draw down of the fiber restricts the formation of this new (unstable) structure.
It increases over several orders of magnitude to the limit of measurability with increasing the draw down ratio.
The amount of endothermic heat increases with increasing the draw ratio, which means that the endotherm is undoubtedly caused by stretching the PLAs films.
A nylon 6,6 complex with GaCl3 in nitromethane (4 5 wt% nylon 6,6) was prepared at 50 70 °C over 24 h for the purpose of disrupting the interchain hydrogen bonding between nylon 6,6 chains, resulting in amorphous nylon 6,6, and increasing the draw ratio for improving the performance of nylon 6,6 fibers.
Of note, it is interesting to find that the characteristic backbone vibration mode of PLLA mesophase around 918 cm−1, which has been firstly identified by Stoclet et al. in previous study [Macromolecules 2010, 7228 7237], actually demonstrates a symmetrical peak shifting with increasing the draw ratio.
Fracture mechanics theory predicts an increase in strength with decreasing diameter and increasing the draw ratio also leads to an increase in strength.
Similar(54)
Increasing the draw-ratio resulted in an increased molecular orientation, Young's modulus and tensile strength of the fibers while its effect on the maximum elongation at break was small.
Further improvement can be obtained by increasing the drawing speed.
However, increasing the drawing temperature reduces the tensile strength and modulus over the range tested.
The tensile test results show that tensile modulus of elasticity and yield strength are improved substantially by increasing the drawing ratio.
This in turn increases the draw on an already limited supply, reducing it to a dirty trickle.
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