| Summary: | 碩士 === 國立臺灣科技大學 === 纖維工程技術系 === 82 === The objective for part one is to investigate the
time-dependent, structural relaxation and formation of
precipitates of PDLLA/PLLA ( weight ratio PDLLA:PLLA=1: 1
).The thermal behavior of polymers were analyzed
with differential scanning calorimetry ( DSC ).DMA was
used to measure the change in modulus at transition
temperature.The vibration of functional groups of
polymers were analyzed with FT-IR.The wide-angle X-ray
scattering ( WAXS ) and solid-state 13C-NMR were used to
analyze the crystalline morphology and comformation of
polymers. This research is specifically concerned with
hydrolysis behavior of biodegradable polymers,
namely, semi-crystalline poly(L-lactide) (PLLA),
amorphous poly ( D,L-lactide ) ( PDLLA ) and semi-
crystalline poly ( ε -caprolactone)(PCL), under the
various times of hydrolysis and temperatures.
The vibration of functional groups of polymers after
hydrolysis were analyzed with FT-IR.GPC and DSC were used to
measure the variation of molecular weight and degree of
crystalline with hydrolysis time.The chain degradation
process can be described by first-order auto-catalytic
kinetics.Futhermore, activation energy of hydrolysis can
be obtained by Arrhenius equation.
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