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标题:PLA nanocomposites: Effect of filler type on non-isothermal crystallization
时间:2020-01-15 19:24:46
DOI:10.1016/j.tca.2010.08.004
作者:G. Z. Papageorgiou;D. S. Achilias;S. Nanaki
关键词:Poly(lactic acid;Reinforcement ligaments;Silica nanoparticles;Montmorillonite;Multi-walled carbon nanotubes;Thermal characterization
出版源: 《Thermochimica Acta》 ,2010 ,511 (1) :129-139
摘要:Nanocomposites of poly( l-lactic acid) (PLA) with fumed silica nanoparticles (SiO 2), montmorillonite (MMT) and oxidized multi-walled carbon nanotubes (o-MWCNTs), containing 2.5 wt% nanoparticles were prepared, by solved evaporation method. SEM micrographs evidenced fine dispersion of the nanoparticles into PLA matrix. This has as result to act as efficient reinforcing agents increasing the storage modulus, as was verified from DMA analysis. The nanoparticles were found to be effective nucleaging agents in cases of silica nanoparticles and MWCNT. On cooling from the melt crystallization was accelerated by the presence of nanoparticles and the effective activation energy calculated using the isoconversional method of Friedmann decreased. The nucleation activity was calculated. Cold-crystallization was also affected by the presence of nanoparticles. However, it seems that the phenomenon begins at lower temperatures and this results in formation of imperfect crystalline structure which reduce macromolecular chain mobility of the remaining amorphous polymer, finally limiting the ultimate crystallinity.
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目录:
  • PLA nanocomposites: Effect of filler type on non-isothermal crystallization
    • Introduction
    • Experimental
      • Materials
      • Preparation of PLA nanocomposites
      • Morphological examination
      • Dynamic mechanical analysis (DMA)
      • Wide-angle X-ray diffraction (WAXD) study
      • Differential scanning calorimetry (DSC)
      • Polarizing light microscopy (PLM)
    • Results and discussion
      • Nanocomposites preparation and characterization
      • Non-isothermal melt crystallization
        • Non-isothermal melt crystallization kinetics
        • Effective activation energy
        • Nucleation activity
      • Non-isothermal cold-crystallization
        • Cold-crystallization kinetics
        • Effective activation energy of cold-crystallization
        • Nucleation activity
      • Lauritzen–Hoffman analysis
      • PLM observations during melt crystallization
      • Prediction of the dynamic fragility from glass transition
    • Conclusions
    • References

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