Abstract
Crystallization behavior of poly lactic acid (PLA) in addition of Cardo materials having fluorene moiety was investigated. From DSC results, it was found that PLA added Cardo materials had two melting peaks: the peak at a lower temperature was corresponding to the melting temperature of δ－form crystal and the higher one is that of α－form crystal structure of PLA. From Temperature-controlled XRD results, the δ－form crystal structure of PLA can also be detected at high temperature regions as well as the α－form crystal structure in PLA matrix when Cardo materials were added into PLA. Furthermore, the isothermal crystallization processes of PLA with Cardo materials were estimated by means of rheorogical measurement and optical microscopic observation. These results indicated as follows; (a) the activation energy on crystallization were 43.7 kJ/mol for neat PLA, 68.1 kJ/mol for PLA with BCF (5 wt%), and 60.1 kJ/mol for PLA with BPF (5 wt%), and (b) the crystal growth rate of the PLA with Cardo materials was getting much slower than that of neat one.
