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유원재 ( Won-jae Youe ),이수민 ( Soo-min Lee ),이성숙 ( Sung-suk Lee ),김용식 ( Yong Sik Kim ) 한국목재공학회 2016 목재공학 Vol.44 No.3
The lignin-based carbon nanofiber reinforced epoxy composite has been prepared by immersing carbon nanofiber mat in epoxy resin solution in order to evaluate the physical and mechanical properties. The thermal and mechanical properties of the carbon nanofiber reinforced epoxy composite were analyzed using thermogravimetric analysis (TGA), differential scanning calorimeter (DSC) and tensile tester. It was found that the thermal properties of the carbon nanofiber reinforced epoxy composite improved, with its glass-transition temperature (Tg) increased from 90.7℃ (Tg of epoxy resin itself) to 106.9℃. The tensile strengths of carbon nanofiber mats made from both lignin-g-PAN copolymer and PAN were 7.2 MPa and 9.4 MPa, respectively. The resulting tensile strength of lignin-based carbon nanofiber reinforced epoxy composite became 43.0 MPa, the six times higher than that of lignin-based carbon nanofiber mats. The carbon nanofibers were pulled out after the tensile test of the carbon nanofiber reinforced epoxy composite due to high tensile strength (478.8 MPa) of an individual carbon nanofiber itself as well as low interfacial adhesion between fibers and matrices, confirmed by the SEM analysis.
Pyrolysis Properties of Lignins Extracted from Different Biorefinery Processes
( Hyung Won Lee ),( Hanseob Jeong ),( Young-Min Ju ),( Won-Jae Youe ),( Jaejung Lee ),( Soo Min Lee ) 한국목재공학회 2019 목재공학 Vol.47 No.4
The non-isothermal and isothermal pyrolysis properties of H lignin and P lignin extracted from different biorefinery processes (such as supercritical water hydrolysis and fast pyrolysis) were studied using thermogravimetry analysis (TGA) and pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). The lignins were characterized by ultimate/proximate analysis, FT-IR and GPC. Based on the thermogravimetry (TG) and derivative thermogravimetry (DTG) curves, the thermal decomposition stages were obtained and the pyrolysis products were analyzed at each thermal decomposition stage of non-isothermal pyrolysis. The isothermal pyrolysis of lignins was also carried out at 400, 500, and 600 °C to investigate the pyrolysis product distribution at each temperature. In non-isothermal pyrolysis, P lignin recovered from a fast pyrolysis process started to decompose and produced pyrolysis products at a lower temperature than H lignin recovered from a supercritical water hydrolysis process. In isothermal pyrolysis, guaiacyl and syringyl type were the major pyrolysis products at every temperature, while the amounts of p-hydroxyphenyl type and aromatic hydrocarbons increased with the pyrolysis temperature.
미세먼지 제거용 필터 제조를 위한 나노셀룰로오스 다공구조체
유원재 ( Won-jae Youe ),박지수 ( Ji-soo Park ),안병준 ( Byoung-Jun Ahn ),권재경 ( Jaegyoung Gwon ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.2
기존 보건용 마스크나 공기청정용 에어필터 소재의 고분자 소재를 대체할 수 있는 생분해성 나노셀룰로오스 기반 에어필터를 제조하고자 하였다. Nippon paper chemicals Co., Ltd.(Japan)에서 정제된 셀룰로오스 파우더를 구입하여 기계적 처리를 통해 나노셀룰로오스를 제조하였다. 미세먼지를 거를 수 있는 다공구조체 제조를 위해 진공여과방식을 적용하였으며 나노섬유의 뭉침현상 억제와 다공구조 형성 유도를 위해 유기용매 혼합 및 무기입자 첨가량을 조절하여 나노셀룰로오스 기반 에어필터의 다공구조를 제어하고자 하였다. 제조된 에어필터의 형태학적 특성은 주자전자현미경을 통해 확인하였으며, 상용 필터(KF94) 대비 미세입자 제거효율 분석은 별도로 제작한 수직 풍동형 필터 성능 시험기를 이용하여 분석하였다. 나노셀룰로오스 현탁액의 진공여과시 유기용매의 혼합은 나노섬유의 뭉침현상을 감소시킬 수 있는 것으로 확인되었다. 또한, 나노셀룰로오스 현탁액 내 무기입자의 첨가를 통해 에어필터의 다공구조 형성을 유도할 수 있었으며, PM2.5 이하 미세입자를 약 80% 이상 제거 가능한 것으로 나타났다.
수세용 타월의 습윤 인장강도 분석을 통한 한국산업표준 개정
유원재 ( Won-jae Youe ),유선화 ( Sun-hwa Ryu ),이태주 ( Taiju Lee ),박주생 ( Joo-saeng Park ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
본 연구에서는 위생용지 시장이 확대되고 소비자들의 위생용지에 대한 관심이 증가함에 따라 시중에 유통되고 있는 종이 타월의 품질을 분석하고 현재 한국산업표준으로 제정된 수세용 타월(KS M 7710)의 품질기준 중 습윤 인장강도의 합리적 기준에 대한 개정안을 제안하고자 한다.
Organosolv 전처리를 통한 리기다소나무의 바이오에탄올 생산 적용성 평가
유원재(Won-Jae Youe),김용식(Yong Sik Kim),강규영(Kyu-Young Kang) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.4
In this study, the feasibility of utilizing wood chips from pitch pine (Pinus rigida) was evaluated for bioethanol production by an organosolv pretreatment and enzymatic saccharification. When wood chips from pitch wood were pretreated with 75% (v/v) ethanol and 1.7% sulfuric acid as a catalyst at H-factor 2000, average pulp yield was 43.3%, which pretreated wood fibers showed higher glucan (55.8%) and lower lignin (12.2%) contents than untreated control (43.9% glucan and 27.8% lignin). After enzymatic saccharification, the organosolv pulps with 56.2% delignification rate reached above 97% conversion rate of cellulose to glucose. These results indicated that increasing the delignification rate causes micro pores on the surface of organosolv pulps resulting in improved the accessibility of enzyme onto the substrate. Moreover, it was in agreement with the SEM examination of wood fibers.
수세용 타월의 습윤 인장강도 분석을 통한 한국산업표준 개정
유원재 ( Won-jae Youe ),유선화 ( Sun-hwa Ryu ),이태주 ( Taiju Lee ),박주생 ( Joo-saeng Park ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
본 연구에서는 위생용지 시장이 확대되고 소비자들의 위생용지에 대한 관심이 증가함에 따라 시중에 유통되고 있는 종이 타월의 품질을 분석하고 현재 한국산업표준으로 제정된 수세용 타월(KS M 7710)의 품질기준 중 습윤 인장강도의 합리적 기준에 대한 개정안을 제안하고자 한다.
Jaegyoung Gwon,Won-Jae Youe,Jisoo Park,Youngsoo Kim 강원대학교 산림과학연구소 2021 강원대학교 산림과학연구소 학술대회 Vol.2021 No.10
Although chemical modifications (grafting ‘onto’) of CNCs have been successfully adopted to enhance theirdispersibility in apolar matrices and solvents, the problem of the dispersion level of mCNCs (chemically modified CNCs) in apolar matrices above a certain loading of nanoparticles remains an issue. CNCs were successfully modified using toluene diisocyanate, and the effects of the molar mass (Mw) and crystallinity (Xc) of semicrystalline poly(lactic acid) (PLA) on the mechanical and thermal properties of mCNC filled PLA nanocomposites were investigated. An increase in the mechanical properties of the PLA nanocomposites with mCNCs implied that Mw and Xc of PLA can be key factors to improve the dispersion level of mCNCs. In our solvent dilute polymer system, despite a reduction in the crystallinity of PLA with increasing mCNC loading level, the melting temperature of the PLAs remained constant due to the mCNC effect, which hinders the chain mobility of the PLAs. The results demonstrated that a fundamental understanding of the crystallinity and molar mass of polymers as well as surface modification of CNCs can be a reasonable approach to take full advantage of the potential usage of CNCs as reinforcements.
Effect of Lignocellulose Nanofibril Addition on the Properties of Lignin-based Plastic Composite
Hyun-Woo Nam-Gung,Won-Jae Youe,Chan-Woo Park,Song-Yi, Han,Pureun-Narae Seo,Yong-Sik Kim,Seung-Hwan Lee 강원대학교 산림과학연구소 2017 강원대학교 산림과학연구소 학술대회 Vol.2017 No.11
Lignin is the most abundant aromatic biopolymer and exists in lignocellulose. Although lignin has been known as difficult material to be utilized as high value added product, research on the development of bioplastics from lignin has attracted attention. In this study, lignocellulose nanofibrill (LCNF) was used as a reinforcing filler to improve the mechanical properties of lignin-based polycaprolactone (PCL) composite, and polymeric methylene diphenyl diisocyanate (pMDI) was added as a coupling agent to improve interfacial adhesion between lignin and PCL matrix. Kraft lignin and PCL were mixed with ratios of 10/90, 30/70 and 50/50, and then extruded using a a twin-screw extruder at 140 ℃ with 100 rpm of screw rotation. LCNF (5, 10, and 20phr) and pMDI (1 and 3 phr) were added to lignin/PCL (30/70) during twin-screw extruding. The effect of lignin content, pMDI and LCNF addition on morphological characteristics, tensile strength, and melt flow index of lignin/PCL composite was investigated. In addition, the effect of lignin plasticization with ε-caprolactone on the properties of plasticized lignin/PCL composite was also investigated.