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폴리에스테르 공중합체의 Fabrication 연구(I) - PET/PETG Blends의 물리적 특성 -
이소화,현은재,황성혁,제갈영순,장상희,김봉식,Lee, So Hwa,Hyeon, Eun Jae,Hwang, Seong Hyeok,Jang, Sang Hui,Kim, Bong Sik 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.10
Blends of poly(ethylene terephthalate) (PET) and poly(ethylene terephthalate glycol) (PETG) were prepared on a twin-screw extruder. Blend films were prepared by solid state extrusion on a capillary rheometer, Crystallinity, thermal, dynamic mechanical, rheological, and mechanical properties of these blend films were investigated. PET/PETG blend films exhibited single $T_{g}$ and $T_{m}$ because of the compatibility of PET with PETG. The crystallinity and density of these blend films increased with increasing draw ratio. Storage modulus of PET/PETG blend films increased with increasing draw ratio. The viscosity of PET/PETG blends was lower than that of the parent polymers and exhibited a minimum at the PET/PETG composition of 90/10. The tensile strength of PET/PETG blend films increased with increasing draw ratio but decreased with increasing PETG content.
알루미늄 합금 디스크용 마찰재의 제조 및 그 특성에 관한 연구
손태관 ( Son Tae Gwan ),장상희 ( Jang Sang Hui ),제갈영순 ( Je Gal Yeong Sun ) 한국복합재료학회 2003 Composites research Vol.16 No.4
본 연구는 자동차용 알루미늄 합금 디스크에 적용하기 위한 마찰재 제조에 관한 내용을 제시한 것이다. 최적 마찰재 조성을 확보하기 위하여 섬유, 결합재, 충진재, 마찰 성능 조정재 등으로 분류할 수 있는 각 원재료를 채택, 배합 설계에 의한 마찰재 시편을 제작하였으며 그 특성을 실제 차량 1/5 크기의 브레이크 다이나모미터를 이용하여 평가하였다. 마찰성능을 JASO C406 P1에 준하여 실험한 결과 마찰계수가 0.35~0.38, fade율이 18%였으며, 내 마모성은 JASO C427에 준하여 온도별 마모시험을 실시하였는데 시험 종료후 마찰재의 마모량이 1.6㎜, 디스크 마모량이 0.08㎜ 수준인 우수한 배합 조성을 획득할 수 있었다. 시험 전?후의 마찰재와 알루미늄 합금 디스크의 표면상태는 주사전자현미경을 이용하여 관찰하였다. This article deals with the manufacture and test results of asbestos-free friction material for Aluminium alloy disk. In order to obtain optimum formulation, various formulations of fibres, matrix. modifiers. tillers. etc were designed and evaluated. The constant friction and brake dynamometer tests were performed to know weak and strong point for each friction material. The C21 formulation of various tested formulations exhibited superior friction constant(0.35-38), fade rate (18%) by JASO C406 test mode and maximum wear 1.6 mm. disc wear 0.08 mm by JASO C427 test mode. The surface morphology of Al, alloy disk(before and after test) was observed by Scanning Electron Microscope(SEM) and Image Analyzer.
Synthesis and Properties of Poly(2-ethynyl-N-propargylpyridinium bromide)
갈용순,이원철,귀태롱,이상섭,배장순,김봉식,장상희,진성호,Gal, Yong Sun,Lee, Won Cheol,Gwi, Tae Rong,Lee, Sang Seop,Bae, Jang Sun,Kim, Bong Sik,Jang, Sang Hui,Jin, Seong Ho Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.2
Ionic conjugated polymer, poly(2-ethynyl-N-propargylpyridinium bromide), was prepared by the cyclopolymerization of 2-ethynyl-N-propargylpyridinium bromide on using various transition metal catalysts, or by thermal methods without adding catalyst. The polymerization of 2-ethynyl-N-propargylpyridinium bromide catalyzed by PdCl2 gave the resulting polymers in relatively high yields. The polymer structure was characterized by various instrumental methods to confirm the conjugated polymer backbone structure carrying cumulated pyridine moiety. The polymers prepared by PdCl2 in DMSO or m-cresol were completely soluble in DMF, DMSO, and formic acid. The inherent viscosities of the resulting polymers were in the range of 0.07-0.19 dL/g. Thermal properties of the polymers were also discussed.
전분/펙틴 블렌드 필름의 기계적 물성 및 산소 투과도 연구
서석훈 ( Seo Seog Hun ),정세환 ( Jeong Se Hwan ),김성철 ( Kim Seong Cheol ),김봉식 ( Kim Bong Sig ),신용섭 ( Sin Yong Seob ),이태진 ( Lee Tae Jin ),장상희 ( Jang Sang Hui ),신부영 ( Sin Bu Yeong ) 한국공업화학회 2003 공업화학 Vol.14 No.8
생분해성 및 수용성이며 식용 가능한 펙틴/전분 필름을 제조하여 기계적, 열적 특성, 흡습성 및 산소 투과도를 조사하였다. 필름의 인장 강도와 탄성률은 전분의 함량이 증가할수록 감소하였고, 신장률은 거의 영향이 없었다. 가소제 글리세롤의 함량이 증가할수록 인장 강도와 탄성률은 급격히 감소하나, 신장률은 조금 증가하였다. 높은 상대습도에 노출된 필름의 경우 탄성률과 인장 강도는 감소하였고, 신장률은 증가하였다. 흡수율은 글리세롤의 함량에 따라 변하지만, 펙틴/전분 비에 따라서는 큰 변화가 없었다. 펙틴/전분 블렌드 필름의 혐기성 생분해도는 전분의 함량이 증가할수록 증가하였다. 펙틴/전분 블렌드 필름의 산소 투과도는 전분의 함량이 증가할수록 산소 투과도는 높아졌으며, 가소제로 사용된 글리세롤의 양이 증가할수록 산소 투과도는 증가하였다. Mechanical and thermal properties, waterabsorption, and anaerobic biodegradability of pectin/starch blend film were observed. Tensile properties of pectin/starch blend films were strongly affected by the amount of glycerol and the ratio of pectidstarch. Tensile strength and modulus decreased as the content of glycerol increased while, the elongation at break increased. Water absorption of pectin/starch blend films was much affected by the amount of glycerol, where as the effect of pectidstarch content ratio on the water absorption property was not much. Biodegradability of film under anaerobic condition increased with increasing starch content. Oxygen permeability of pectin/starch blend films increased as the contents of starch and glycerol increased.