Biodegradable blends of high molecular weight poly(ethylene oxide) with poly(3-hydroxypropionic acid) and poly(3-hydroxybutyric acid): a miscibility study by DSC, DMTA and NMR spectroscopy
✍ Scribed by Yong He; Naoki Asakawa; Yoshio Inoue
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 199 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
The miscibility of high molecular weight poly(ethylene oxide) blends with poly(3hydroxypropionic acid) and poly(3-hydroxybutyric acid) (P(3HB)) has been investigated by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and highresolution solid state 13 C nuclear magnetic resonance (NMR). The DSC thermal behaviour of the blends revealed that the binary blends of poly(ethylene oxide)/poly(3-hydroxypropionic acid) (OP blends) were miscible over the whole composition range while the miscibility of poly(ethylene oxide)/ poly(3-hydroxybutyric acid) blends (OB blends) was dependent on the blend composition. OB blends were found to be partly miscible at the middle P(3HB) contents (25 %, 50 %) and miscible at other P(3HB) contents (10 %, 75 % and 90 %). Single-phase behaviour for OP blends and phase separation behaviour for OB blends were observed from DMTA. The results from NMR spectroscopy revealed that the two components in the OP50 blend were intimately mixed on a scale of about 35 nm, while the domain sizes in the OB blend with a P(3HB) content of 50 % were larger than about 32 nm.