AFM Observation of Sunflower-like Crystalline Morphology Formed in Ultra-thin Film of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

Abstract

Abstract: Poly(3-hydroxybutyrate-co-103-hydroxyhexanoate)(PHBHHx) thin films were prepared by means of spin-coating PHBHHx/chloroform solutions on the silicon substrate. The crystalline morphologies of PHBHHx thin films were observed by atomic force microscopy(AFM) at room temperature. A novel crystalline morphology, that is like sunflower was found when the film is very thin and named as sunflower-like crystalline morphology. Compared with usual PHBHHx spherulites, there are obvious differences in aspects of nucleation, crystal growth process and crystalline morphology for the sunflowers. The PHBHHx/chloroform solution properties and the substrate have great effects on the formation of the sunflower. A circular boundary that may result from a liquid-liquid phase separation in PHBHHx solution first formed in the thin film during the spin-coating process, then it induced the formation of the sunflowers.

Key words: Thin film, Sunflower-like crystal morphology, Liquid-liquid phase separation

CLC Number:

TB43

TrendMD:

WANG Zhen, XU Jun, XIE Xu-Ming, WANG Xiu-Feng . AFM Observation of Sunflower-like Crystalline Morphology Formed in Ultra-thin Film of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)[J]. Chem. J. Chinese Universities, 2005, 26(1): 192.

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AFM Observation of Sunflower-like Crystalline Morphology Formed in Ultra-thin Film of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

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