Biodegradable Compatibilized Poly(<Emphasis Type="SmallCaps">l</Emphasis>-lactide)/Thermoplastic Polyurethane Blends: Design,Preparation and Property Testing |
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| Authors: | Kanyarat Suthapakti Robert Molloy Winita Punyodom Kanarat Nalampang Thanawadee Leejarkpai Paul D Topham Brian J Tighe |
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| Institution: | 1.Polymer Research Group, Department of Chemistry, Faculty of Science,Chiang Mai University,Chiang Mai,Thailand;2.Materials Science Research Center, Faculty of Science,Chiang Mai University,Chiang Mai,Thailand;3.National Metal and Materials Technology Center, National Science and Technology Development Agency,Thailand Science Park,Pathum Thani,Thailand;4.Aston Institute of Materials Research,Aston University,Birmingham,UK;5.Department of Chemical Engineering and Applied Chemistry, School of Engineering and Applied Science,Aston University,Birmingham,UK |
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| Abstract: | Biodegradable blends of poly(l-lactide) (PLL) toughened with a polycaprolactone-based thermoplastic polyurethane (TPU) elastomer and compatibilized with a purpose-designed poly(l-lactide-co-caprolactone) (PLLCL) copolymer were prepared. Both 2-component (PLL/TPU) and 3-component (PLL/TPU/PLLCL) blends of various compositions were prepared by melt mixing, hot-pressed into thin films and their properties tested. The results showed that, although the TPU could toughen the PLL, the blends were immiscible leading to phase separation with the TPU domains distributed in the PLL matrix. However, addition of the PLLCL copolymer could partially compatibilize the blend by improving the interfacial adhesion between the two phases. Biodegradability testing showed that the blends were biodegradable and that the PLLCL copolymer could increase the rate of biodegradation under controlled composting conditions. The 3-component blend of composition PLL/TPU/PLLCL?=?90/10/10 parts by weight was found to exhibit the best all-round properties. |
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