| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 88 === Miscibility in poly(phenyl methacrylate)(PPhMA)/poly(benzyl methacrylate)(PBzMA) and poly(ε-caprolactone)(PCL)/PPhMA/PBzMA blends and morphology observation of crystalline domain of PCL/PPhMA /PBzMA were studied by using differential scanning calorimeter (DSC), polarized-light microscopy (POM), fourier transform infrared spectrometer (FTIR), and scanning electron microscopy. Thermal analysis showed only one glass transition temperature (Tg) in PPhMA/PBzMA blend system. The morphology of uniform miscibility without lower critical solution temperature (LCST) was observed. The FTIR result indicate an intimate mixing state between these two polymers, leading to mutual influence in the absorbance wavenumbers for the C=O, ether group, and possibly phenyl rings. The evidences in amorphous domain in a ternary component of PCL/PPhMA/PBzMA showed that only one glass transition temperature and uniform single phase. Hence it demonstrated that miscibility existed in the ternary system. The results of POM and thermal transition also revealed that reversibility of LCST behavior existed. In addition, Flory-Huggins theory was used to fit the experimental miscibility boundary. These results showed that ring-banded spherulites were observed in neat PCL crystallized at high temperatures above 50C, and in blends regardless of crystallization temperatures. The state of phase behavior can strongly influence the pattern of ring bands in the PCL spherulites in miscible PCL blends. The mechanism of the ring-banded spherulites was also explained to be due to inter-molecular interaction in miscible blends.
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