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Perpendicularly Oriented Lamellae in poly(3-hydroxybutyric acid-co-3-hydroxyvaleric Acid) Blended With an Amorphous Polymer: Ultra-Thin to Thick Films

Perpendicularly Oriented Lamellae in poly(3-hydroxybutyric acid-co-3-hydroxyvaleric Acid) Blended With an Amorphous Polymer: Ultra-Thin to Thick Films

Chean-Cheng Su, Eamor M Woo, Ya-Ting Hsieh

Phys Chem Chem Phys. 2013 Feb 21;15(7):2495-506.

PMID: 23318504

Abstract:

The oppositely oriented lamellae in ridge and valley bands of ring-banded spherulites in biodegradable poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) interacting with amorphous poly(vinyl acetate) (PVAc) were examined using polarized-light optical, scanning electron, and atomic-force microscopy techniques (POM, SEM, AFM). Solvent-etching and fracturing were utilized for probing the interior morphology of the large-size ring-banded spherulites in PHBV/PVAc (70/30) blend [T(c) = 110 °C] films or thick bulk of various thicknesses. SEM analysis revealed that dual ridges of two opposite-oriented lamellae correspond to two-color bands (yellow and blue) of successive rings in POM micrographs. Fracture of thick blend samples further exposed that interior 3D spherulites were composed of sheath-kebab (similar to corrugated board) lamellae of two mutually perpendicular orientations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP80181313	Poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid)		80181-31-3	Price

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