Crystalline Lamellae and Surface Morphology of Biodegradable Polyhydroxyalkanoate Thin Films: Thermal Behavior and Comparison between Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and Poly(3-hydroxybutyrate)
Crystalline Lamellae and Surface Morphology of Biodegradable Polyhydroxyalkanoate Thin Films: Thermal Behavior and Comparison between Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and Poly(3-hydroxybutyrate)
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DOI：
10.1021/ma7020858
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发表时间：
2008-02
期刊：
影响因子：
5.5
通讯作者：
Katsuhito Mori;S. Mukoyama;Ying Zhang;Harumi Sato;Y. Ozaki;H. Terauchi;I. Noda;I. Takahashi
中科院分区：
文献类型：
--
作者：
Katsuhito Mori;S. Mukoyama;Ying Zhang;Harumi Sato;Y. Ozaki;H. Terauchi;I. Noda;I. Takahashi
We investigate surface morphology and crystalline structure of biodegradable polymers poly(3-hydroxybutyrate) (PHB) and its random copolymer poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(HB-co-HHx), HHx = 12 mol %) using surface-sensitive techniques. Surface region typically to a depth of about 10 nm of polymer films which have thickness ranging from 20 to 120 nm is observed by grazing incidence X-ray diffraction (GIXD), X-ray reflectivity (XR), and atomic force microscopy (AFM). Both PHB and P(HB-co-HHx) show that crystallographic b-axis of crystallites in the surface region is aligned in the direction normal to the surface. It indicates that intermolecular interaction along a-axis is still dominant in the surface region, which would also determine the fastest growth direction of crystalline lamellae. A lattice relaxation peculiar to P(HB-co-HHx) surfaces is recognized in the b-axis length. As temperature is raised, crystalline lamellae characterized by densely packed molecular chains appear, implying...
