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폴리아미드6/반응성 포리프로필렌 블렌드계에서 SEBS-g-MA의 충격개선효과
고재송,윤태성,정인권,최형기,장윤호,Koh, Jae Song,Yoon, Tae Sung,Jung, In Kwon,Choi, Hyeong Ki,Jang, Yoon Ho 한국공업화학회 1999 공업화학 Vol.10 No.8
PA6/PP-g-MA 블렌드계에 상용성 충격개선제로서 SEBS-g-MA를 첨가하여 용융혼합하였고 기계적 물성과 모폴로지 변화를 조사하였다. SEBS-g-MA의 첨가에 의해 인장강도는 약간 감소하지만 파단신율은 증가하였다. 충격강도는 PP-g-MA와 SEBS-g-MA 함량이 증가할수록 증가하였다. 이는 무수말레산의 카르복시기와 아마이드의 반응에 의해 계면접착력과 상용성의 개선이 이루어졌기 때문이다. Dynamic mechanical thermal analyzer(DMTA)를 이용한 tan ${\delta}$의 변화에서도 전형적인 고분자 블렌드의 상용화거동을 보였다. 최종적으로 이 블렌드물의 상구조를 관찰한 결과에서도 SEBS-g-MA의 첨가에 따라 분산상의 크기가 감소하는 것으로 보아 상용성과 계면접착력이 개선됨을 확인하였다. Melt blend of PA6/PP-g-MA system containing SEBS-g-MA as a compatible impact modifier was prepared to investigate the change of mechanical properties and morphologies. The tensile strength slightly decreased, but the elongation at break increased with increasing content of SEBS-g-MA in the blend. Also the notched izod impact strength increased with increasing the content of PP-g-MA and SEBS-g-MA. It is attributed to improved compatibilization and interfacial adhesion by reaction of the amide of PA6 with maleic anhydride of SEBS-g-MA and PP-g-MA. The result of dynamic mechanical analysis(DMA) showed a typical behavior of the compatibilization in the polymer blends. Finally, in the phase structure observed by the use of SEM, we confirmed improvement of the compatibilization and interfacial adhesion with increasing the content of SEBS-g-MA and PP-g-MA.
구리입자 기반 UV경화도료 코팅 목질 마루판의 항균 특성
이동건,임남기,고재송,Lee, Dong-Gun,Lim, Nam-Gi,Koh, Jae-Song 한국건축시공학회 2023 한국건축시공학회지 Vol.23 No.4
This research evaluates the antibacterial and transparency properties of UV-curable paint augmented with 20wt% copper particles. The transparency assessment indicated that the paint maintained a total luminous transmittance of 90% or above, thereby matching or surpassing the performance of standard UV-curing paints. To further test its antibacterial capabilities, wooden flooring boards were coated with the UV-curable paint laced with 20wt% copper particles, which had been surface-modified with a silane coupling agent. Following the fatigue tests of these treated boards, an impressive bacterial reduction rate of 99.9% was noted after a span of 6 hours, demonstrating the paint's exceptional antibacterial performance.
곽성복(Sung Bok Kwak),김재옥(Jae Ok Kim),이동기(Dong Gi Lee),주상률(Sang Ryool Ju),김준형(Joon Hyung Kim),고재송(Jae Song Koh),강보성(Bo Sung Kang),정선경(Sun Kyung Jeoung),유승을(Seung Eul Yoo),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the trend of automotive interior parts is focused on improvement of light weight materials. Thermoplastic foams are materials that are composed of a cellular core structure created by the expansion of blowing agents of volatile gases or liquids, which can be economically used in insulating, packaging, and automobile industries. Thermoplastic olefins (TPO) are currently evaluated as a potential replacement of PVC or ABS blends in automotive interior skins such as Door Trim (DT) and Instrument Panel (IP) skins. In this study, micro cellular foaming materials applied automotive instrument panel was investigated.
진동ㆍ소음 저감형 자동차 Window용 웨더스트립의 승하강 내구성능 및 내환경성에 대한 연구
정선경(Sun-Kyoung Jeoung),유승을(Seung-Eul Yoo),이재용(Jae-Yong Lee),고재송(Jae-Song Koh),김도형(Do-Hyeong Kim),이기영(Ki-Young Lee),이창수(Su-Chang Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this study, weatherstrip, which has function as impact relaxation of door's opening and shutting and protection against bad weather, was developed for drivers. Also, it offer drivers. comfortable environment with reducing noise that occurred in the outside. Then, weather strip's characteristics are determined by sound insulation of item, evaluation of elevating durability of the weather strip according to circumstance, and environmental resistance property after aging. Evaluation of elevating durability of the weather strip is carried out by sound insulation test. And environmental resistance property is perform using ozone resistance test, pollution resistance test, and weathering test. In G/run's environmental resistance test, crack, pollution, and color change are not confirmed. The values of tensile strength and extension rate are 130 ㎏f ㎝?² and 288%, respectively. As well, the hardness is measured to be 72 Hs, and there is no result difference because the same material is used for mass-produced products and developed products. A repulsive force change rate of an aging and a noise shielding performance of the developed product of Glass run appeared to be below 44% and more than 58 ㏈, respectively. Therefore, we could be confirmed that the performance of the developed product has been more improved than the existing mass-produced products. The test of the elevating durability performance of the developed product of Glass run is satisfied 30 thousand times of limit durability, and scratches, heavy operation, connection, and pushing phenomena, etc. is not observed.
다층구조 압출 발포 자동차 대형 내장 부품 개발에 관한 연구
곽성복(Sung Bok Kwak),이동기(Dong Gi Lee),주상률(Sang Ryool Ju),조창현(Chang Hyun Cho),김준형(Joon Hyung Kim),고재송(Jae Song Koh),강보성(Bo Sung Kang),정선경(Sung Kyung Jeoung),유승을(Seung Eul Yoo),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermoplastic foams are materials that are composed of a cellular core structure created by the expansion of a blowing agents of volatile gases or liquids, which can be economically used in insulating, packaging, and automobile industries. It due to the optimized properties of stiffness, strength, and energy absorption. Thermoplastic olefins(TPO) are currently evaluated as a potential replacement of PVC or ABS blends in automotive interior skins such as Door Trim(DT) and Instrument Panel(IP) skins. Some of the advantages of TPO over PVC or ABS skins are improved UV and heat aging, reduced fogging due to absence of plasticizer exudation, and recyclability. In this study, the nucleation and volume expansion behaviors of ethylene-octene copolymer were investigated at when different types of PP with different Melting Index(MI) values were incorporated in the foaming process. The effects of polypropylene and its melt flow characteristics on the cell density, final expansion ratio, and foam morphology were examined.
상용화제 SEBS-g-MA가 PA6/PP-g-MA 블렌드계의 나노 고차구조에 미치는 영향
고재송,이창형,최형기,한애란,나재운 한국공업화학회 2003 공업화학 Vol.14 No.3
Polyamide 6 (PA6)/maleated polypropylene (PP-g-MA) 블렌드계의 상용화제로 maleic anhydride (MA)가 그래프트(graft)된 poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS-g-MA)를 첨가하여 블렌드의 고차구조에 미치는 영향을 small angle x-ray scattering, DSC 및 SEM을 이용하여 고찰하였다. SEBS-g-MA가 첨가된 시료는 첨가되지 않은 시료보다 PA6분상의 크기가 작았는데 이는 가공 또는 열처리 중 SEBS-g-MA의 무수말레산과 PA6의 아민 그룹(amine group) 사이에 반응이 일어나 PA6/PP-g-MA 계면에 PA6-SEBS-g-MA 그래프트 공중합체가 형성되어 이 공중합체가 상용화제로서 작용하여 계면장력을 안정화시켜 PA6 분산상 크기를 작게 한 것으로 추정되었다. 첨가된 SEBS-g-MA의 일부는 마이크로 상분리(Micro-phase separation)되어 미세 분산상으로 존재하게 되는데 그 크기는 첨가된 양이 많을수록, 저온보다 고온일수록 크다는 것이 관찰되었다. 미세 분산상 SEBS-g-MA는 PP-g-MA 연송상의 결정화도를 낮추는 반면, PA6 분산상의 결정화도는 증가시켰다. Effect of maleic anhydride grafted triblock copolymer of poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS-g-MA) on the morphology of the blends of polyamide 6 (PA6) and maleated polypropylene (PP-g-MA) was investigated by small angle x-ray scattering, differential scanning calorimeter and scanning electron microscopy. The size of the dispered PA6 decreased with addition of SEBS-g-MA. SEBS-g-MA reacted with the amine group of PA6 during the melt-compounding, and as a result, the copolymer, formed by interfacial reaction between PA6 and SEBS-g-MA, led to reduction in size of the dispersed PA6. SEBS-g-MA was partially microphase-separated to dispersion phase, and its size increased proportional to the amount of added SEBS-g-MA and increased temperature. The microphase-separated dispersion phase highly affected the crystallinity of the PP-g-MA matrix and PA6 dispersion.