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홍채환(Chae-Hwan Hong),김세원(Se Won Kim),김용운(Yong-Woon Kim),박현달(Hyun-Dal Park),신현재(Hyun-Jae Shin) 한국생물공학회 2014 KSBB Journal Vol.29 No.5
Recently seaweed polysaccharides have been extensively studied for alternative energy application. Because their producing cost is high and efficiency low, their industrial applications have been limited. The main component of cell wall of red algae represented by Gelidiales and Gracilariales is agar. Red-algae agar or galactan, consisting of D-galactose and 3, 6-anhydro-L-galactose, is suitable for bio-product application if hydrolyzed to monomer unit. For the hydrolysis of algae, chemical or enzymatic treatment can be used. A chemical process using a strong acid is simple and efficient, but it generates together with target sugar and toxic compounds. In an enzymatic hydrolysis process, target sugar without toxic compounds generation. The objective of this review is to summary the recent data of saccharification by chemical and enzymatic means from red seaweed for especially focused on automobile industry.
홍채환(Chae Hwan Hong),김시환(Si Hwan Kim),서지연(Ji Yeon Seo),한도석(Do Suck Han),김용환(Yong Hwan Kim) 한국생물공학회 2011 KSBB Journal Vol.26 No.6
There has been a growing attention on PDLA (poly D-lactic acid) since stereocomplex PLA, a kind of polymer alloy between PLLA and PDLA was known much thermally stable compared PLLA. Superior characteristics of stereocomplex PLA result in the elevated demand for D-lactic acid. Although many research works have been reported for L-lactic acid production especially food industry, however there are relatively few research works for D-lactic acid production since D-lactic acid cannot find any applications in food industry. Most imminent issue for D-lactic acid is the economic production process that requires low cost medium, efficient lactic acid producing microorganism and finally large scale-up design. In this review, current status of D-lactic acid production process will be summarized and discussed for the further improvement of D-lactic acid production process.
홍채환(Chae Hwan Hong),이용범(Young Bum Lee),배진우(Jin Woo Bae),조재영(Jae young Jho),남병욱(Byeong uk Nam),황태원(Tae Won Hwang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Nanocomposites of polypropylene with organically modified clays were compounded on a twin-screw extruder by a two-step melt compounding of three components, i.e., polypropylene, maleic anhydride grafted polypropylene (MA-g-PP), and organically modified clay. The effect of MA-g-PP compatibilizers, including PH-200, Epolene-43, Polybond-3002, Polybond-3200, with a wide range of maleic anhydride (MA) content and molecular weight was examined. Nanocomposites' morphologies and mechanical properties such as stiffness, strength, and impact resistance were investigated. X-ray diffraction patterns showed that the dispersion morphology of clay particles seemed to be determined in the first compounding step and the further dispersion of clays didn't occur in the second compounding step. As the ratio of MA-g-PP to clay increased, the clay particles were dispersed more uniformly in the matrix resin. As the dispersibility of clays was enhanced, the reinforcement effect of the clays increased, however impact resistance decreased.
스테레오 컴플렉스를 이용한 폴리유산 복합재 제조 및 성능 개선
홍채환(Hong, Chae-Hwan),박준서(Park, Jun-Seo),남병욱(Nam, Byeong-Uk),김연희(Kim, Yeon-Hee) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.3
폴리-L-유산 (PLLA)/폴리-D-유산(PDLA)의 스테레오컴플렉스(SC) 특유의 결정 거동은 PLLA/PDLA의 블렌드의 특정한 용융 조건에서 나타난다. 이를 적용하여 PLA 스테레오컴플렉스를 제조하기 위해 전반적인 조성에서 PLLA와 PDLA 를 블렌드 하였다. 또한 충격 강도와 열변형온도 같은 기계적 물성 및 열적 특성을 향상시키기 위해 충격보강제, 탈크와 유리 섬유(GF) 등의 보강제를 첨가하였다. 그 결과로 열변형 온도가 115℃ 에서 관찰 되는 조성의 복합재를 제조하였다. 더 경제적 인 방법으로, PLLA와 상용화된 폴리프로필렌(PP)을 전반적인 조성에서 블렌드 하였다. 그 결과, 특정 조성에서 상용화된 PP/탈크 복합재와 ABS에 적용시킬 수 있는 물성을 나타내었다. 이러한 결과는 PP와 PLLA같은 매트릭스 수지에 유리섬유 및 충격보강제를 잘 분산시키는 것에서 기인하는 것으로 판단된다. A unique crystallization behavior of poly(L-lactide)(PLLA)/poly(D-lactide)(PDLA) stereocomplex(SC) was observed when a PLLA/PDLA blend was subjected to the specific melting conditions. Therefore, we tried to blend PLLA and PDLA at overall composition to form PLA stereocomplexes. Moreover, impact modifier and reinforcement materials such as talc and glass fiber added to enhance the mechanical and thermal properties such as impact strength and heat distortion temperature(HDT). As a result, we got one representative result, one composite recipe with HDT 115℃. For more economic technology, we tried to blend PLLA and Polypropylene at overall composition and we got another representative result which could be applied to current PP/talc composites and ABS materials. The core technology of this might be the well dispersion of glass fibers into the matrix resin such as PP, PLLA and impact strength modifier.