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- W2093693148 abstract "Compared with pristine polymers, bionanocomposites derived from biopolymers and inorganic nanoparticles have significantly improved electrical/magnetic properties, mechanical properties, thermal stability, gas barrier properties, and fire retardance. In this study, poly(lactic acid) (PLA) nanocomposites were prepared by in situ melt polycondensation of l-lactic acid with different loading ratios of surface-hydroxylated magnesium oxide (MgO) nanocrystals. Molecular weight, structure, morphology, and thermal properties of the nanocomposites were characterized. PLA-grafted MgO (PLA-g-MgO) was isolated from free PLA for the nanocomposite with 3% MgO via repeated dispersion/centrifugation processes and characterized. The weight-average molecular weight of the PLA-0.01%MgO nanocomposite was 55500, which was 30% higher than that of pure PLA. Discoloration of PLA was obviously depressed in the presence of MgO nanocrystals. Formation of hydrogen bonding between PLA chains and surface −OH groups from MgO was detected by Fourier transform infrared spectroscopy. Morphological images showed uniform dispersion of MgO nanocrystals in the PLA matrix and demonstrated a strong interfacial interaction between the PLA matrix and MgO nanocrystals. PLA-MgO nanocomposites exhibited improved thermal stability compared with pure PLA. Calculations based on thermogravimetric analysis revealed that more than 42.5% PLA was successfully grafted into PLA-g-MgO." @default.
- W2093693148 created "2016-06-24" @default.
- W2093693148 creator A5036199278 @default.
- W2093693148 creator A5059420555 @default.
- W2093693148 date "2010-06-11" @default.
- W2093693148 modified "2023-10-03" @default.
- W2093693148 title "Preparation and Characterization of Polymer−Inorganic Nanocomposites by In Situ Melt Polycondensation of <scp>l</scp>-Lactic Acid and Surface-Hydroxylated MgO" @default.
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- W2093693148 doi "https://doi.org/10.1021/bm100320q" @default.
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