Paper TF-TuP36
Crystallization of Biodegradable Poly-[(R)-3-Hydroxybutyrate] Ultrathin Films revealed by Surface-sensitive X-ray Diffractions: Effect of Small Amount of Biodegradable Poly(L-lactide)s with Different Molecular Weights
Tuesday, December 9, 2014, 4:00 pm, Room Mauka
| Session: |
Thin Films Poster Session |
| Presenter: |
Naotaka Torimoto, Kwansei Gakuin University, Japan |
| Authors: |
N. Torimoto, Kwansei Gakuin University, Japan
N. Shimatani, Kwansei Gakuin University, Japan
R.R. Kumetha, Kwansei Gakuin University, Japan
I. Takahashi, Kwansei Gakuin University, Japan
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| Correspondent: |
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Biodegradable polymers synthesized by bacteria are environmental-friendly material. Poly-[(R)-3-hydroxybutyrate] (PHB) is one of the most intensively studied biological polymers and is also used to many applications. We investigated a new confinement effect of biodegradable poly(L-lactide) (PLLA) on crystallization of PHB ultrathin films with surface-sensitive X-ray diffractions in which PLLA with large molecular weight can reduce the crystallinity of PHB thin films effectively, although its mechanism is still not fully-understood. [1] In the present study, we expand our research in a wider range of molecular weight of PLLA as well as that of PHB, since controlling crystallinity, orientation of crystallographic axes with respect to the films surface and surface morphology of PHB thin films should be a key to controlling physical properties including thermal plasticity, brittleness and piezoelectric constant of PHB, that is quite favorable for a wider range of applications. Grazing incident X-ray diffraction (GIXD) and X-ray reflectivity (XR) are used to estimate degree of crystallization, thickness, electron density and surface roughness of polymer blend of PHB and PLLA spin-coated films deposited on silicon 100 wafers isothermally. Molecular weights of PHB were 1,000 and 650,000 g/mol, and those of PLLA were 2,000, 50,000, 100,000 and 300,000 g/mol, respectively for films with typical thicknesses of 30 nm.
[1] Xiaoli Sun, Akihisa Tokuda, Yusuke Oji, Takashi Nakatani, Hideto Tsuji, Yukihiro Ozaki, Shouke Yan, and Isao Takahashi, Macromolecules 45 (2012) 2485–2493
Keywords: biological polymer, polymer blend, crystalline polymer, X-ray surface diffraction, surface and thin films