PBAT는 다른 생분해성 폴리에스터인 PLA, PBS보다 좀 더 신축성이 있고, 신장율이 높아서 식품 포장재나 농업용 필름에 더 적합하다. 즉, 합성 지방족 폴리에스터는 우수한 기계적 물성을 가지고, 천연 고분자는 저렴한 가격과 우수한 생분해성을 가지므로 두 물질의 블렌드를 통해 서로의 장점을 효과적으로 이용할 수 있다. 따라서 본 연구에서는 생분해성 지방족-방향족 폴리에스터의 하나인 polybutylene adipate-co-terephthalate(PBAT)의 가격 경쟁력 확보를 위하여 대표적인 천연 고분자의 하나인 전분을 ...
PBAT는 다른 생분해성 폴리에스터인 PLA, PBS보다 좀 더 신축성이 있고, 신장율이 높아서 식품 포장재나 농업용 필름에 더 적합하다. 즉, 합성 지방족 폴리에스터는 우수한 기계적 물성을 가지고, 천연 고분자는 저렴한 가격과 우수한 생분해성을 가지므로 두 물질의 블렌드를 통해 서로의 장점을 효과적으로 이용할 수 있다. 따라서 본 연구에서는 생분해성 지방족-방향족 폴리에스터의 하나인 polybutylene adipate-co-terephthalate(PBAT)의 가격 경쟁력 확보를 위하여 대표적인 천연 고분자의 하나인 전분을 가소화 시킨 TPS를 여러 가소제를 이용하여 제조하고, 이를 PBAT에 혼합비를 달리하여 블렌드하였다. 또한, 가교제로 dicumyl peroxide(DCP)를 사용하여 PBAT/TPS 블렌드의 필름을 만들기에 적정한 가교제의 양을 알아보았다. 그리고 TPS의 조성 및 함량이 PBAT/TPS 블렌드의 열적 특성 및 물리적 특성에 미치는 영향에 대해 조사하였다.
PBAT는 다른 생분해성 폴리에스터인 PLA, PBS보다 좀 더 신축성이 있고, 신장율이 높아서 식품 포장재나 농업용 필름에 더 적합하다. 즉, 합성 지방족 폴리에스터는 우수한 기계적 물성을 가지고, 천연 고분자는 저렴한 가격과 우수한 생분해성을 가지므로 두 물질의 블렌드를 통해 서로의 장점을 효과적으로 이용할 수 있다. 따라서 본 연구에서는 생분해성 지방족-방향족 폴리에스터의 하나인 polybutylene adipate-co-terephthalate(PBAT)의 가격 경쟁력 확보를 위하여 대표적인 천연 고분자의 하나인 전분을 가소화 시킨 TPS를 여러 가소제를 이용하여 제조하고, 이를 PBAT에 혼합비를 달리하여 블렌드하였다. 또한, 가교제로 dicumyl peroxide(DCP)를 사용하여 PBAT/TPS 블렌드의 필름을 만들기에 적정한 가교제의 양을 알아보았다. 그리고 TPS의 조성 및 함량이 PBAT/TPS 블렌드의 열적 특성 및 물리적 특성에 미치는 영향에 대해 조사하였다.
Polybutylene adipate-co-terephthalate (PBAT) is one of the promising materials for the production of environmentally friendly biodegradable polymers. The mechanical properties of PBAT such as softness and flexibility are insufficient for various end-use applications. For desirable mechanical propert...
Polybutylene adipate-co-terephthalate (PBAT) is one of the promising materials for the production of environmentally friendly biodegradable polymers. The mechanical properties of PBAT such as softness and flexibility are insufficient for various end-use applications. For desirable mechanical properties, fillers are mixed into the biodegradable polymer matrix. Also, the prices of these biodegradable PBAT are generally high cost, and thus blending with low-price resins becomes an alternative approach to resolving this problem. In particular, biopolymer fillers derived from annually renewable resources and used to form biodegradable blends have received much attention recently. Starch, one of most abundant natural food sources for most plants, has been considered an attractive biopolymer filler because of its low cost, low density, nonabrasive nature, biodegradability, and so forth. Unfortunately, native starch generally exists in a granular state because of the inherent hydrogen bonding between adjacent molecules. Therefore, starch fails to disperse on an extremely fine scale into a plastic matrix. Efforts to solve this problem have led to the recent development of thermoplastic starch prepared by the incorporation of suitable amounts of water and plasticizers; this is called gelatinization. This work was undertaken to examine in depth the effect of starch and gelatinized starch on the physical and mechanical properties of PBAT/starch blends. Different degrees of gelatinization were used with various amounts of glycerol and ethylene glycol. The blends were characterized with thermal analysis, including differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA). The tensile strength and elongation at break were evaluated and elucidated in a morphology study with scanning electron microscopy(SEM). In summary, this study could lead to a better understanding of blend performance and pave the way to producing a new generation of biodegradable plastics for our environment.
Polybutylene adipate-co-terephthalate (PBAT) is one of the promising materials for the production of environmentally friendly biodegradable polymers. The mechanical properties of PBAT such as softness and flexibility are insufficient for various end-use applications. For desirable mechanical properties, fillers are mixed into the biodegradable polymer matrix. Also, the prices of these biodegradable PBAT are generally high cost, and thus blending with low-price resins becomes an alternative approach to resolving this problem. In particular, biopolymer fillers derived from annually renewable resources and used to form biodegradable blends have received much attention recently. Starch, one of most abundant natural food sources for most plants, has been considered an attractive biopolymer filler because of its low cost, low density, nonabrasive nature, biodegradability, and so forth. Unfortunately, native starch generally exists in a granular state because of the inherent hydrogen bonding between adjacent molecules. Therefore, starch fails to disperse on an extremely fine scale into a plastic matrix. Efforts to solve this problem have led to the recent development of thermoplastic starch prepared by the incorporation of suitable amounts of water and plasticizers; this is called gelatinization. This work was undertaken to examine in depth the effect of starch and gelatinized starch on the physical and mechanical properties of PBAT/starch blends. Different degrees of gelatinization were used with various amounts of glycerol and ethylene glycol. The blends were characterized with thermal analysis, including differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA). The tensile strength and elongation at break were evaluated and elucidated in a morphology study with scanning electron microscopy(SEM). In summary, this study could lead to a better understanding of blend performance and pave the way to producing a new generation of biodegradable plastics for our environment.
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