| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 103 === Biodegradable materials have gradually been focused some attension because they began to realize the importance of environmental sustainability. Poly(lactic acid) (PLA) is a aliphatic polyester and a biodegradation polymer due to it’s biodegradable and biocompatibility which have attracted great attension. In this study, we blended PLA with Poly(hydroxybutyrate) (PHB) in different proportions (100/0, 95/5, 90/10, 85/15, 80/20, 70/30, w/w). PHB is a typical biodegradable thermoplastic polymer produced by microorganisms and has environmentally-friendly We hope it could have a good compatibility, mechanical properties and biodegradability in PLA/PHB blends. The glass transition temperature (Tg) of PLA/PHB blends decreased with increasing amount of PHB, which indicates that both blend systems are partially miscible systems. The elongation at break was increased from 4.41% to 6.16% by amount 5 wt% PHB. In addition, we try to use the chemical modifier, Maleic anhydride(MA) or Octadecenyl succinic anhydride(ODSA) add to PLA/PHB blends. The elongation at break was increased in 6.92% and 6.44% by amount 10 wt% and 20 wt% PHB. Thermal degradation temperature of PLA/PHB/ODSA is also greater than PLA/PHB blends at least 10 °C. Finally, PLA/PHB film has weight loss which from 7.25% (PLA) to 13.0% (PLA/PHB 95/5) in enzymatic degradating test. Adding 5 wt% PHB could accelerate the degradating rate.
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