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에스테르 교환반응을 통한 PLA와 PBAT간 상용성 및 인열강도 향상

에스테르 교환반응을 통한 PLA와 PBAT간 상용성 및 인열강도 향상
DGIST Authors
권미경; 이성준김현철정상원이세근
Issue Date
2019년 한국섬유공학회 춘계학술대회
Many researches have been carried out to replace non-degradable films with biodegradable films, and the blend of PLA / PBAT is considered to be the most promising material. Although PLA has many advantages such as low price and mechanical strength, it is difficult to be formed as blown film due to lack of toughness and it has been solved by supplementing the weakness with other materials such as PBAT. However, the high cost of PLA/PBAT film still hinders the replacement of non-degradable film. The increase of the content of PLA in film has been expected to make the cost reasonable, while the poorer the tear strength gets as the larger the amount of PLA is. Most of studies on PLA / PBAT materials have been conducted to increase the compatibility between two resins by introducing various additives. Our ultimate goal is to improve the tear strength of PLA / PBAT film by raising the compatibility between the two resins. Three kinds of organometallic catalysts was used to introduce the transesterification between PLA and PBAT. We observed the change on the molecular weight, polydisperse index and the radius of dispersions with respect to the compounding temperature and time as well as the type and content of organometallic catalysts. It is well-known that the polydisperse index decreases due to the re-construction distribution of molecular weights and the compatibility between two components in an immiscible blend affects the size of dispersions. The organometallic catalyst was added during the melt blending through the internal mixer and the content of PLA was fixed at 35%. After evaluating the improvement in their compatibility, blown films were produced through a twin-screw extruder at the chosen conditions and the improvement of tear strength was checked using Elmendorp testing machine. This research was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT for First-Mover Program for Accelerating Disruptive Technology Development (2018M3C1B9069748). This work was also supported by the DGIST R&D Program of the Ministry of Science, ICT and Future Planning of Korea (18-ET-02) and Ministry of Trade, Industry and Energy (Project No. 10060069) of the Republic of Korea.
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Division of Biotechnology2. Conference Papers

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