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|標題:||Isothermal crystallization kinetics of poly(3-hydroxybutyrate)/layered double hydroxide nanocomposites||作者:||Hsu, S.F.
|關鍵字:||isothermal crystallization kinetics;layered double hydroxides;nanocomposites;poly(3-hydroxybutyrate);layered double hydroxides;poly(ethylene oxide);enzymatic degradation;melting behavior;phase-structure;blends;polychlorotrifluoroethylene;poly(beta-hydroxybutyrate);electrolytes;miscibility||Project:||Journal of Polymer Science Part B-Polymer Physics||期刊/報告no：:||Journal of Polymer Science Part B-Polymer Physics, Volume 44, Issue 23, Page(s) 3337-3347.||摘要:||
Poly(3-hydroxybutyrate) (PHB)/layered double hydroxides (LDHs) nano-composites were prepared by mixing PHB and poly(ethylene glycol) phosphonates (PEOPAs)-modified LDH (PMLDH) in chloroform solution. Both X-ray diffraction data and TEM micrographs of PHB/PMLDH nanocomposites indicate that the PMLDHs are randomly dispersed and exfoliated into the PHB matrix. In this study, the effect of PMLDH on the isothermal crystallization behavior of PHB was investigated using a differential scanning calorimeter (DSC) and polarized optical microscopy. Isothermal crystallization results of PHB/PMLDH nanocomposites show that the addition of 2 wt % PMLDH into PHB induced more heterogeneous nucleation in the crystallization significantly increasing the crystallization rate and reducing their activation energy. By adding more PMLDH into the PHB probably causes more steric hindrance of the diffusion of PHB, reducing the transportation ability of polymer chains during crystallization, thus increasing the activation energy. The correlation among crystallization kinetics, melting behavior and crystalline structure of PHB/PMLDH nanocomposites can also be discussed. (c) 2006 Wiley Periodicals, Inc.
|Appears in Collections:||材料科學與工程學系|
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