| Summary: | 碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 104 === Characterization of the poly(lactic acid) (PLA)-grafted cadmium selenide (CdSe) quantum dots (QDs) and PLA-grafted CdSe quantum dots on multiwalled carbon nanotubes hybrid materials was investigated by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), fluorescence spectroscopy (FL) and polarized optical microscopy (POM). In this study, the thioglycolic acid-capped CdSe QDs were prepared by the hydrothermal method, and discussed the resultant optical characteristics and microstructures. With the increase of the degree of reaction, the particle size of CdSe QDs increases and the emission peak tends to red-shift. The quantum confinement effect was proved. The MWCNT-CdSe nanohybrids were synthesized by using of cross-linking agent, and the emission peak tends to blue-shift when CdSe was covalently attached to the MWCNT surface. In the PLA/CdSe hybrid materials, the spherulite radial growth rate of PLA was found to be improved by adding CdSe QDs and MWCNT-CdSe, indicating that CdSe and MWCNT-CdSe acted as a nucleating agent. The results of DSC showed that the crystallization kinetics of the PLA increased and the half-time of crystallinity are decreased by adding CdSe QDs and MWCNT-CdSe. It shows that PLA/MWCNT-CdSe and PLA/CdSe hybrid materials would improve the crystallinity of PLA. According to these results, the addition of CdSe quantum dots and MWCNT-CdSe will enhance the crystaliization growth rate and crystallization kinetics of PLA.
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