Thermoforming starch‐graft‐polycaprolactone biocomposites via one‐pot microwave assisted ring opening polymerization |
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Authors: | Peter R. Chang Ziyan Zhou Peihu Xu Yun Chen Shaofeng Zhou Jin Huang |
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Affiliation: | 1. Saskatoon Research Centre, Agriculture and Agri‐Food Canada, Saskatoon, SK S7N 0X2, Canada;2. Department of Agricultural and Bioresource Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada;3. College of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, China;4. School of Basic Medical Science, Wuhan University, Wuhan 430071, China |
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Abstract: | A thermoformable starch‐graft‐polycaprolactone biocomposite was prepared by initiating ring‐open polymerization of caprolactone monomer onto starch under microwave irradiation. In this case, the thermoplastic and hydrophobic modification of starch could be realized by one‐pot grafting PCL, where the grafted PCL chains acted as the “plasticizing” tails of thermoforming and as the hydrophobic species of water‐resistance. The resultant biocomposites were injection‐molded as the sheets and their structure and properties were investigated by Fourier transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, differential scanning calorimetry, dynamic mechanical analysis, contact angle measurement, and tensile testing. In this case, the grafted PCL chains entangled each other, and hence contributed to the strength and elongation of biocomposites. This work provided a simple strategy of one‐pot thermoplastic and hydrophobic modification of starch, and may be applied in a continuous process of modification, compounding, and molding. Meanwhile, the resultant biocomposites containing starch are believed to have a great potential application as an environment‐friendly and/or biomedical material. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
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Keywords: | starch graft polycaprolactone biocomposite thermoforming water‐resistance biodegradable graft copolymers |
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