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Pure Appl. Chem.,
Vol. 69, No. 12, pp. 2567-2575, 1997
COMMISSION ON POLYMER CHARACTERIZATION AND PROPERTIES
Studies on Biodegradable Poly(Hexano-6-Lactone)
Fibers- 1. Structure and propoerties of Drawn Poly(Hexano-6-Lactone)
Fibers
(Technical Report)
M. Mochizuki,
K. Nakayama, R. Qian, B.-Z. Jiang, M. Hirami, T.
Hayashi, T. Masuda, and A. Nakajima
[full
text - pdf 607 kB]
Abstract: Using high molecular weight (Mn=80,000)
poly(hexano-6-lactone) (PCL*), tough and high tenacity PCL monofilaments
with various draw ratios (undrawn to 9 times drawn) were prepared by
melt-spinning. The relationship between microstructure and properties
of the PCL fibers is described in this current IUPAC Technical Report.
Analysis of microstructure of the drawn PCL fibers by wide-angle X-ray
diffraction revealed typical c-axis orientation with an increase in
crystallinity. It was also supported by sonic velocity measurements.
The thermal, mechanical, and dynamic mechanical properties of the PCL
fibers were affected significantly by draw ratio. DSC thermograms showed
that the melting temperature and the enthalpy of fusion increased with
draw ratio. The temperature dependence curves of dynamic viscoelasticity
showed that the temperature at tan d
peak of a dispersion corresponding to the glass transition temperature
shifted toward higher temperature and the peak value of tan d
decreased with draw ratio. The dynamic storage modulus and the sonic
modulus increased with draw ratio. These results are due to the increase
in crystallinity and molecular orientation with drawing, and are responsible
for an increase in tensile tenacity as well as knot tenacity of the
PCL fibers.
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