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Crystal Growth in Poly(L-lactide) Thin Film Revealed by in situ Atomic Force Microscopy

✍ Scribed by Yoshihiro Kikkawa; Hideki Abe; Masahiro Fujita; Tadahisa Iwata; Yoshio Inoue; Yoshiharu Doi

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
294 KB
Volume
204
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Direct visualization of crystal growth in poly(L‐lactide) thin films was carried out by using a temperature‐controlled atomic force microscopy (AFM). At the initial stage of crystallization, edge‐on lamellar crystals have nucleated and elongated. Subsequently, the edge‐on lamellar crystals showed S‐shaped morphology and changed their orientation from edge‐on manner to flat‐on one. The curvature of edge‐on lamellar crystal has been discussed in terms of inclination and distortion of polymer chains in the crystal. In addition, mechanism on the formation of flat‐on crystal from edge‐on lamellae was proposed as derivative growth on the basis of in situ AFM observation of crystal growth and enzymatic degradation.
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In-Situ Atomic Force Microscopy Observation of Enzymatic Degradation in Poly(hydroxyalkanoic acid) Thin Films: Normal and Constrained Conditions
✍ Yoshihiro Kikkawa; Takuya Hirota; Keiji Numata; Takeharu Tsuge; Hideki Abe; Tada 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 327 KB

## Abstract **Summary:** The enzymatic degradation of lamellar crystals in poly(hydroxyalkanoic acid) thin films has been visualized by using in‐situ dynamic force mode (tapping mode) atomic force microscopy (AFM) in buffer solution. It was found that poly(hydroxybutyric acid) (PHB) depolymerase fr