کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1403009 984803 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanocomposites of poly(l-lactide) and surface-grafted TiO2 nanoparticles: Synthesis and characterization
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Nanocomposites of poly(l-lactide) and surface-grafted TiO2 nanoparticles: Synthesis and characterization
چکیده انگلیسی

A new method of surface modification of TiO2 nanoparticles by surface-grafting l-lactic acid oligomer was developed. The surface-grafting reaction was evaluated by Fourier transformation infrared (FTIR) and thermal gravimetric analysis (TGA). The results showed that l-lactic acid oligomer could be easily grafted onto the TiO2 nanoparticles surface in the presence of stannous octanoate and the highest amount of grafted polymer was about 8.5% in weight. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) results showed that grafted TiO2 (g-TiO2) in chloroform or PLLA matrix approximated to uniform, while unmodified TiO2 nanoparticles tended to aggregate. The tensile strength of this material was greatly improved by the addition of g-TiO2 nanoparticles in poly(l-lactide) (PLLA) matrix. The tensile strength of the g-TiO2/PLLA nanocomposite containing 5 wt.% of g-TiO2 was 72 MPa, which was 23.1% higher than that of pure PLLA. Even though the incorporation of the TiO2 nanoparticles into PLLA led to the deterioration of its elongation at break, the g-TiO2/PLLA nanocomposite also exhibited better ductility than that of TiO2/PLLA nanocomposite.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 44, Issue 8, August 2008, Pages 2476–2481
نویسندگان
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