Characterization
FTIR spectra were measured by a Bruker Tensor 27 spectrome-ter equipped with a MCT detector. For studying the crystallizationbehavior of PLLA via FTIR, The Linkam THMS600 heating stage wasused to regulate the temperature. All the spectra were recorded bycoadding 32 scans at a 2 cm−1resolution.
The Bruker D8 X-ray diffractometer with Cu K radiation( = 0.154 nm) was used for WAXD measurement. DSC measure-ment was performed on a TA Q20 calorimeter system over atemperature range from 20 to 200◦C at a heating rate of 10◦C/minunder a nitrogen gas flow at a rate of 50 ml/min.