Journal
POLYMER DEGRADATION AND STABILITY
Volume 98, Issue 4, Pages 885-893Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2013.01.003
Keywords
Poly(L-lactide); Rutile titania; Anatase titania; Nanocomposite; UV irradiation; Stability
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Funding
- National Natural Science Foundation of China [50873067]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20110181110032]
- NSFC-CNRS Joint Project [51011130288, 51211130101]
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Poly(L-lactide)/titania (PLLA/TiO2) nanocomposites were in situ synthesized through ring-opening polymerization of L-lactide. Two types of TiO2, anatase and rutile, were used in the synthesis of composites. The chemical structure, crystallinity, thermal stability and morphology of composite thin films were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The effects of TiO2 on the stability of the nanocomposites under UV irradiation as a function of time were investigated by FTIR, XRD, UV absorption spectroscopy and differential scanning calorimetry (DSC). The obtained results indicated that rutile TiO2 particles have a screening effect while anatase TiO2 acts as a photocatalyst The DSC results revealed that anatase TiO2 embedded in bulk of the films produces the same effect as rutile TiO2. (C) 2013 Elsevier Ltd. All rights reserved.
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