Topography of Polyhydroxybutyrate Banded Spherulites

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (6): 1216.

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Topography of Polyhydroxybutyrate Banded Spherulites

XU Jun¹, GUO Bao-Hua¹, ZHANG Zeng-Min¹, CHEN Guo-Qiang², WANG Xiu-Feng³

1. Institute of Polymer Science & Engineering, Department of Chemical Engineering, School of Materials Science & Engineering;
2. Department of Biological Sciences and B iotechnology;
3. Department of Physics, Tsinghua University, Beijing 100084, China

Received:2001-06-05 Online:2002-06-24 Published:2002-06-24

Abstract

Abstract: On polyhydroxybutyrate banded spherulites, concentric rings were observed between cross polarizers or without polarizers. The rings used to be considered as cracks. In this paper, we provide evidences to distinguish the concentric rings from cracks observed on PHBspherulites. Furthermore, atomic force microscopy confirmed that these concentric rings with varying spacing were growth terraces rather than cracks. The height of the terraces reached up to several hundred nanometers. It was observed that the external terraces were higher than the internal terraces, which was proposed to result from layer-by-layer growth. This is the first report on the new microscopic feature of polyhydroxybutyrate spherulites. Spherulites with birefringent bands, wavy fluctuation of height were also observed.

Key words: Polyhydroxybutyrate, Banded spherulites, Atomic force microscopy, Topography

CLC Number:

O631

TrendMD:

XU Jun, GUO Bao-Hua, ZHANG Zeng-Min, CHEN Guo-Qiang, WANG Xiu-Feng . Topography of Polyhydroxybutyrate Banded Spherulites[J]. Chem. J. Chinese Universities, 2002, 23(6): 1216.

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Topography of Polyhydroxybutyrate Banded Spherulites

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