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Chemical durable polyurethane synthesis using cardanol-based bio-polyol
오태욱,차상호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Cardanol has an unsaturated chain with 1 to 3 double bonds that have antimicrobial properties in the meta position of the phenol group, making it a resource for preparing new functional materials for various polymers. The development of a new polyurethane polyols from cardanol, a renewable resource obtained by cashew nut is often reported. In this study, bio-Polyol synthesis is modified via ethanolamine using formaldehyde. The synthesis of polyols was confirmed by H-NMR and FT-IR. The synthesis of polyurethane was confirmed through FT-IR. The thermal stability and properties of the polyurethane were analyzed by TGA, chemical resistance and UTM.
Preparation and Characterization of Polyurethane Using one-step Synthesis of Cardanol-Based Polyol
오태욱,차상호 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Polyurethane is widely used in industrial fields due to excellent mechanical properties and abrasion resistance. However, as increasing the regulation on use of petroleum resources, the researches on synthesis of polyurethane using bio-based resources have been attracted. Among bio-based resources, cardanol is a natural oil extracted from cashew nut shells. In addition, biopolyols is expected to have antibacterial properties. Accordingly, biopolyol based on cardanol was synthesized and characterized by H-NMR and FT-IR. Polyurethane film was then fabricated via the reaction of biopolyol and hexamethylene diisocyanate and confirmed using FT-IR. Thermal stability and mechanical strength were performed by TGA and UTM, respectively, and antibacterial properties were measured using the shaking method.
UML을 이용한 송전선로 보호계전기 정정프로그램 분석/설계
吳泰旭,崔勉松,李承宰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
PROSET2000 that is integrated protective management system had developed and used in order to automate the setting process of protective relays in transmission system protection. PROSET2000 have database for relay setting and automated for relay setting program within. This paper proposed PCM current differential relay setting program point of Object Oriented Programming paradigm using Unified Modeling Language about additional relay in PROSET2000. Nevertheless each relay uses same current differential but setting method is different. This paper discribed different thing about setting method of each relay and evaluated more effective and corrective relay setting program using UML.
Synthesis of bio-polyol from cardanol derived by cashew nut
오태욱,차상호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Bioplastics are fabricated by using more than 25% of biomass as raw materials. Cardanol extracted from cashew nut shell liquid (CNSL) is a resource capable of producing novel functional materials for various polymers by having 1 to 3 double bond-containing unsaturated chains in the meta position of reactive benzene ring and phenol group. Cardanolbased Bio-polyols have been applied to polyurethane. Therefore, polyurethane film was prepared by using bio-polyol synthesized from cardanol, one of the vegetable oils. The aim is to synthesize the biopolyol via modification of benzene ring and prepare the bio-based polyurethane which have superior antibacterial property by using the bio-polyol. The chemical structure of bio-polyol was caracterized via NMR and FT-IR. The thermal stability and properties of the polyurethane were analyzed by TGA and DSC.
한 단계 합성 방법을 통한 카다놀 기반 바이오 폴리올 합성 및 이를 이용한 폴리우레탄의 제조 및 특성
오태욱(Tae-Uk Oh),이원지(Won-Ji Lee),차상호(Sang-Ho Cha) 한국고분자학회 2022 폴리머 Vol.46 No.1
본 연구에서는 한 단계의 합성 방법을 통해 카다놀 기반 바이오 폴리올(CBP)을 합성하였다. CBP는 카다놀, 포름알데히드 수용액, 에탄올아민을 사용한 Mannich reaction을 통해 제조하였으며, ¹H NMR과 FTIR 분석을 통해 CBP가 성공적으로 합성되었음을 확인하였다. CBP와 헥사메틸렌 디이소시아네이트(HDI)를 우레탄 반응하여 바이오 폴리우레탄(CBPU)을 제조하였으며, 폴리에틸렌글리콜(PEG)을 사용하여 제조한 석유계 폴리우레탄(PEGU)을 대조군으로 사용하여 TGA, UTM, 내화학성, 항균성에 대한 분석을 수행하였다. 이러한 분석 결과 CBPU는 CBP 고유의 화학적 분자 구조 차이를 바탕으로 대조군 PEGU와 비교하여 E. coli에 대한 높은 항균성과 우수한 내화학성 및 높은 인장강도를 가지고 있음을 확인하였다. In this study, a cardanol based bio-polyol (CBP) was prepared via one-pot synthesis method. The synthesis of CBP was proceeded via Mannich reaction using cardanol, formaldehyde, and ethanolamine. The chemical structure of CBP was confirmed via ¹H NMR and FTIR. Then, bio-polyurethane (CBPU) was prepared using CBP and hexamethylene diisocyanate (HDI). For the comparison experiments, polyethylene glycol (PEG), petroleum-based polyol, was applied to prepare a polyurethane (PEGU) as a control sample. From analyses results for TGA, UTM, chemical resistance test, and antibacterial test for CBPU and PEGU, it was found that CBPU showed higher tensile strength, chemical resistance, and antibacterial properties against E. coli compared to PEGU.