Effect of Bisphenol A on the Miscibility, Phase Morphology and Specific Interaction in Immiscible Biodegradable Poly(ε-caprolactone)/Poly(L-lactide) Blends
| Autor: | Yi-Chih Tung, 童宜峙 |
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| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 Miscibility enhancement on the immiscible binary biodegradable blends of poly(ε-caprolactone) (PCL)/poly(L-lactide) (PLLA) with bisphenol A (BPA) is investigated in this study. The BPA is miscible with both PCL and PLLA since a single Tg over the entire composition range was observed based on differential scanning calorimetry (DSC) analyses. Fourier transform infrared spectroscopy (FTIR) is confirmed that the intermolecular hydrogen-bonding exists between the hydroxyl group of the BPA and the carbonyl group of the PCL and the PLLA at various compositions and temperatures. On the basis of these results, BPA was added as a compatibilizer to immiscible binary PCL/PLLA blend. The addition of BPA is able to enhance the miscibility of the immiscible PCL/PLLA binary blend and transforms into miscible blend when a sufficiently quantity of the BPA is present at room temperature. In addition, optical microscopy (OM) measurements have been performed in order to study the phase morphologies of ternary BPA/PCL/PLLA blends with various temperatures, which indicate the upper critical solution temperature (UCST) phase diagram since the ΔK effect becomes smaller at higher temperature (200 ℃) than at room temperature. Infrared spectra measurements with various temperatures are able to provide good correlation with OM analysis. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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