New biodegradable blends prepared from polylactide, titanium tetraisopropylate, and starch
Corresponding Author
Hsin-Tzu Liao
Department of Chemical and Biochemical Engineering, Kao Yuan University, Kaohsiung County, Taiwan 82151, Republic of China
Department of Chemical and Biochemical Engineering, Kao Yuan University, Kaohsiung County, Taiwan 82151, Republic of China===Search for more papers by this authorChin-San Wu
Department of Chemical and Biochemical Engineering, Kao Yuan University, Kaohsiung County, Taiwan 82151, Republic of China
Search for more papers by this authorCorresponding Author
Hsin-Tzu Liao
Department of Chemical and Biochemical Engineering, Kao Yuan University, Kaohsiung County, Taiwan 82151, Republic of China
Department of Chemical and Biochemical Engineering, Kao Yuan University, Kaohsiung County, Taiwan 82151, Republic of China===Search for more papers by this authorChin-San Wu
Department of Chemical and Biochemical Engineering, Kao Yuan University, Kaohsiung County, Taiwan 82151, Republic of China
Search for more papers by this authorAbstract
In this study, new biodegradable nanocomposites were prepared from poly(lactic acid) (PLA) or acrylic acid grafted poly(lactic acid) (PLA-g-AA), titanium tetraisopropylate, and starch by means of an in situ sol–gel process and the melt-blending method. The samples were characterized with X-ray diffractometry, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and an Instron mechanical tester. According to the results, a PLA-g-AA/TiO2 hybrid could improve the properties of a PLA/TiO2 hybrid because the carboxylic acid groups of acrylic acid should act as coordination sites for the titania phase to form the TiOC chemical bond. It was also found that both the tensile strength and glass-transition temperature increased to a maximum value and then decreased with increasing TiO2 because excess particles (e.g., greater than 10 wt % TiO2) could cause separation or segregation between the organic and inorganic phases. A PLA-g-AA/TiO2/starch hybrid could obviously enhance the mechanical properties of a PLA-g-AA/starch hybrid because the former could provide a smaller starch phase size and nanoscale dispersion of TiO2 in the polymer matrix. The biodegradable nanocomposites produced in our laboratory could provide a plateau tensile strength at break when the starch content was up to 50 wt %. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008
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