| Summary: | 碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 85 === Abstract
PEO ( polyethylene oxide) / PMMA (polymethyl methacrylate)
blends were prepared by either casting from chloroform or
benzene. The compability behavior of them was
investigated by means of differential scanning
calorimetry (DSC) and polarizing optical microscope (POM).
Althought, it was not significant .It was shown from the DSC
results that the crystallization of PEO was more easily
supressed in the chloroform-cast blends than it was in the
benzene-cast blends. Also, it was shown from the POM
measurements that the spherulitic growth rate of PEO/PMMA
blends casted from benzene was much greater than that
casted from chloroform,especially in the blends of high PEO
content (eg. 90/10 and 80/20). The number of nuclei in
PEO/PMMA blends casted from benzene is always greater than that
cast from chloroform in our examining range. Besides, it
was found that the t1/2 of chloroform-cast blends was
much greater than benzene-cast blends in isothermal
crystallization and exhibited a more negative interaction
parameter from Nishi-Wang equation. According to the mentioned
above , chloroform seems to be a better solvent that can
dissolve PEO/PMMA blends more homogeneous.
keyword: PEO, PMMA, blends, solvent effect, miscibility
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