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Crystallization Behavior of Poly(l-lactic Acid) Affected by the Addition of a Small Amount of Poly(3-hydroxybutyrate) by Yun Hu; Harumi Sato; Jianming Zhang; Isao Noda; Yukihiro Ozaki is a Materials Science article available to read on EtoBox.

What is Crystallization Behavior of Poly(l-lactic Acid) Affected by the Addition of a Small Amount of Poly(3-hydroxybutyrate) about?

The miscibility, crystallization and subsequent melting behavior in binary biodegradable polymer blends of poly(L-lactic acid) (PLLA) and low molecular weight poly(3-hydroxybutyrate) (PHB) have been investigated by differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR) spectroscopy, and wide-angle X-ray diffraction (WAXD). DSC analysis results indicted that PLLA showed no miscibility with high molecular weight PHB (M w 1⁄4 650,000 g mol À1 ) in the 80/20, 60/40, 40/60, 20/80 composition range of the PHB/PLLA blends. On the other hand, it showed some limited miscibility with low molecular weight PHB (M w 1⁄4 5000 g mol À1 ) when the PHB content was below 25%, as evidenced by small changes in the glass transition temperature of PLLA. The partial miscibility was further supported by changes of cold-crystallization behavior of PLLA in the blends. During the nonisothermal crystallization, it was found that the addition of a small amount of PHB up to 30% made the cold-crystallization of PLLA occur in the lower temperature. Meanwhile, the crystallization of PHB and PLLA was observed in the heating process by monitoring characteristic IR bands of each component for the

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Author

Yun Hu; Harumi Sato; Jianming Zhang; Isao Noda; Yukihiro Ozaki

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)