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정빛남,강동호,김기홍,이준혁,손다솜,심진기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Polypropylene (PP)/ethylene vinyl alcohol copolymer (EVOH) blends are widely known as immiscible blend systems. In this study, CMC (cellulose microcrystal), which has high affinity with EVOH, was added to the PP/EVOH blend to prove that it is effective in reducing the EVOH dispersed phase in the PP matrix. It was confirmed through mechanical, thermal, and rheological analysis that the PP/EVOH blend gradually changed to a property similar to PP as the content of CMC increased. In addition, it was observed using morphology analysis that the size of the EVOH dispersed phase decreases with increasing CMC content in the PP/EVOH blend. When the PP/EVOH blend with the reduced size of the EVOH dispersed phase is biaxially stretched, the EVOH will be located in a more complex form in the PP matrix, and it is predicted that the oxygen barrier property will be further improved due to these morphological properties.
정빛남,강동호,김기홍,유연화,심진기 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Polypropylene (PP) has poor oxygen barrier properties and is not used alone in food packaging applications. Because of this, CNF and nanoclay have often been employed to improve oxygen barrier properties. In this study, nanocomposites were prepared by fixing the CNF to 1 wt% in the PP matrix and increasing the content of nanoclay from 1 to 5 wt% through melt processing. In addition, nitrogen (N<sub>2</sub>) plasma treatment was performed to improve the affinity between the hydrophobic polymer PP and the hydrophilic nano-sized fillers (CNF and nanoclay). Based on the results of various analyses, Nanocomposites containing 1 wt% CNF and 3 wt% nanoclays in the PP matrix showed the best performance, and the Young's modulus and oxygen barrier properties were improved by 51 and 28%, respectively, compared to neat PP. These results suggest that PP/CNF/nanoclay nanocomposites can be applied to a variety of barrier packaging applications.
2P-86 Effect of Carbon dioxide Adsorption on LDPE/Zeolite 4A composite film
정빛남,강동호,심진기,천솔미,황성욱 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Low density polyethylene (LDPE) has been researched in many industrial applications, and LDPE/Zeolite 4A composites has been extensively studied for many applications such as microporous, breathable film and so on. LDPE/Zeolite 4A composite have a great potential fo CO<sub>2</sub> adsorption film due to its high adsorption ability. In this study, LDPE/Zeolite 4A composites with various contents were prepared by melt mixing process and foaming process to develop a CO<sub>2</sub> adsorption films. The mechanical and morphological properties of composite films has been characterized, CO<sub>2</sub> adsorption properties of the composite film were evaluated by thermogravimetric analysis (TGA) and the performance was analyzed to be about 15 cc/g at 40 wt% of the zeolite content.
Reactive Compatibilization of Poly (lactic acid)/Thermoplastic olefin elastomer Blends
정빛남,천솔미,이미지,심진기,황성욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Poly (lactic acid) (PLA) is an eco-friend and bio-degradable polymer. However, due to the brittleness of PLA, there are limitations in applying it to various industries. Therefore, PLA often blended with other soft polymers such as rubber. In this study, PLA/thermoplastic olefin elastomer (TPOE) blends with various contents were prepared by melt mixing technique. And reactive compatibilization was applied to improve the interfacial adhesion between PLA and TPOE, the elongation at break and flexural strain were profoundly enhanced because of the improved interfacial adhesion between the two phases. We also confirmed that it was feasible to fabricate PLA/TPOE blends with controllable mechanical, barrier properties with combination of PLA and TPOE under reactive compatibilization while retaining the biodegradability.
정빛남,강동호,김기홍,이미지,심진기,황성욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Polypropylene (PP) is widely used polymer in many industrial fields. However, it has not been welcomed in food packaging application due to its poor oxygen barrier. Because of this, nanoclay has often been employed to improve oxygen barrier properties. In this study, EVOH/ clay nanocomposite containing 5 wt% nanoclay in the EVOH matrix was firstly fabricated and applied as a distributed phase in a PP based blend. At this time, EVOH was used as a carrier system to distribute the nanoclay into the hydrophobic PP matrix. The size of the distributed phase was optimized by controlling the amount of PP grafted maleic anhydride (PP-g-MA) as a compatibilizer. Then, EVOH/clay nanocomposites were prepared into powder form by cryo-grinding process and compared with granule type. The mechanical and rheological properties of nanocomposite based blends have been characterized.
고온 (750 ~ 850℃) SOFC용 밀봉재의 특성에 미치는 고열팽창계수를 갖는 필러의 영향
김빛남,이미재,황종희,임태영,김진호,황해진,김일원,정운진,Kim, Bit Nam,Lee, Mi Jai,Hwang, Jong Hee,Lim, Tae Young,Kim, Jin Ho,Hwang, Hae Jin,Kim, Il Won,Chung, Woon Jin 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
In this study, we report that effects of a filler with a high coefficient of thermal expansion on a sealant for high-temperature ($750{\sim}850^{\circ}C$) SOFC. We designed a $SiO_2-BaO-ZnO-B_2O_3-Al_2O_3$ glass system with a softening temperature higher than $750^{\circ}C$. The properties of the glass system show not only low volumetric shrinking but also low swelling. The glass system did not create a crystal phase during along-term heat treatment. We fabricated a seal gasket with 0, 10, 15, and 20 wt% cristobalite added as filler materials with glass powder. The coefficient of thermal expansion of the seal gasket increased according to cristobalite content. During along-term heat treatment, the leak rate decreased by about 5% after a heat treatment in an oxidizing atmosphere at $750^{\circ}C$ for 2000 h, also decreasing by about 6% after a heat treatment in a reducing atmosphere at $750^{\circ}C$ for 1000 h.
손다솜,정빛남,김기홍,이준혁,강동호,심진기 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Polypropylene (PP) is one of the commonly used packaging materials because of its excellent thermal stability, water vapor barrier property, and transparency. However, due to the poor oxygen barrier property of PP, it is manufactured and used as a non-recyclable multilayer film with ethylene vinyl alcohol (EVOH) or polyamide (PA). In this study, TEMPOoxidation cellulose nanofibers (TOCNFs) were used to improve the oxygen barrier property of PP. TOCNFs were easily dispersed in water, which allowed it to be simply coated on the PP using a spray coating method. The thickness of the coated TOCNFs layer was controlled at 200 to 500 nm by spraying time. O<sub>2</sub> plasma treatment was used to improve the affinity of the interface between PP and TOCNFs. When the PP film was coated with TOCNFs, the oxygen transmission rate decreased from 1000 to 3 cc/m<sup>2</sup>·day·atm. In addition, it is easy to separate the coating layer and the PP substrate, so there is an advantage that can be recycle and reuse.