H. Abe, Y. Doi, H. Aoki
Mar 5, 1998
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Influential Citations
143
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Quality indicators
Journal
Macromolecules
Abstract
The films of random copolymers of (R)-3-hydroxybutyric acid with different hydroxyalkanoic acids such as (R)-3-hydroxypentanoic acid, (R)-3-hydroxyhexanoic acid, 4-hydroxybutyric acid, 6-hydroxyhexanoic acid, and (S,S)-lactide were prepared by the melt-crystallized method at various crystallization temperatures. The solid-state structures and thermal properties of melt-crystallized films were characterized by means of wide-angle X-ray diffraction, small-angle X-ray scattering, differential scanning calorimetry, optical microscopy, and scanning electron microscopy. Both the long period distance and the lamellar thickness of melt-crystallized polyester films were increased with an increase in the crystallization temperature. The melting temperature of polyester films also increased with an increase in the crystallization temperature. From the relationship between lamellar thickness and melting temperature, it has been concluded that randomly distributed second monomer units except for the (R)-3-hydroxypenta...