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RISS 인기검색어
- 검색키워드
- 저자 : Chong Rai Park ) (검색결과 4 건)
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정종원,박남국,박선정,박종래,김영철 全南大學校 觸媒硏究所 1997 觸媒硏究 論文集 Vol.19 No.-
The effects of polyols, isocyanates. surfactants and water on the physical properties of the polyurethane foam were investigated. The resin used in this study was prepared from a variety of polyol mixtures by adding catalyst, surfactant and cross-linker. The polyurethane was foamed from the resin by adding an equivalent amount of isocyanate and was used in property measurements. The physical properties were more affected by the type of isocyanates and the amount of water than the sound absorption coefficient. The sound absorption coefficient of the polyurethane foam was superior for the polyol mixture of KE-810(40%)FA-733(40%)/FA-703(20%). The sound absorption coefficient was increased with the amount of surfactant L-5309 up to 3000Hz, but was decreased above that frequency.
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박남국,김영철,박종래 ( Nam Cook Park,Young Chul Kim,Chong Rai Park ) 한국공업화학회 1997 공업화학 Vol.8 No.2
본 연구에서는 폴리우레탄폼 제조시 사용되는 첨가제가 폴리우레탄폼의 기계적 물성에 미치는 영향에 대하여 조사하였다. 실험에 사용된 수지는 KONIX FA-703 폴리에테르폴리올(80%)과, KONIX FA-733 폴리에테르폴리올(20%)에 촉매, 계면활성제, 가료제 등을 혼합하여 제조하였으며, 이 수지에 이소시아네이트(TDI-80, prepolymer M-200, pure MDI)를 당량비로 첨가하여 발포시킨 폼을 상온에서 72시간 경화시킨 후 물성측정에 사용하였다. 폴리우에탄폼의 기계적 물성은 밀도, 인장강도, 인열강도, 신장율, 흡음율 및 gel profile을 조사함으로써 측정하였고, 셀 크기에 대한 계면활성제의 영향은 주사전자현미경(SEM)을 사용하여 측정하였다. 흡음율은 셀의 크기와 직접적인 관련이 있었으며, 계면활성제(L-5309)의 사용량에 따른 인장강도, 인열강도 및 흡음율 등 기계적 물성은 1.0pphp 까지는 첨가량이 많아질수록 증가하는 경향을 보이다가 점차 감소하였다. The effect of additives on the mechanical properties of polyurethane foam were investigated. The resin used in this study was prepared by adding catalyst, surfactant and cross-linker to both KONIX FA-703 polyether polyol(80%) and KONIX FA-733 polyether polyol(20%). The polyurethane was foamed by adding equivalent amount of isocyanate(TDI-80, prepolymer M-200, pure MDI) to the resin and was used in property measurements after 72 hours harderung. The physical properties of polyurethane foam were investigated in terms of density, tensile strength, tear strength, elongation, sound absorption coefficient and gel profile measurements. The effects of surfactant on the cell size was investigated by scanning electron microscopy(SEM). The sound absorption coefficient was directly related to the cell size. The physical properties were improved with increasing amount of surfactant(L-5309) until 1.0 part per hundred polyol(1.0pphp)
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金昌集,姜道烈,朴範鎬,安鐘文,高委恭,金龍來 弘益大學校 1975 弘大論叢 Vol.7 No.-
This is a preliminary study intended to assess the feasibility that the Pilot Institute can be implemented at Hong-Ik University. There are as many as twenty universities throughout the country that have initiated the Pilot Institute up to the academic year 1975 in further and of their educational programs. The total number of credit hours as previously required, which include programs for Major, Minor, Electives, Teacher Education and the like. This study finds that these universities have maintained and exercised a wide range of discretion and flexibility in the implementation of Pilot Institute, not necessarily taking the same approach. It must be pointed out that these universities were faced with various problems and difficulties in the initial stages of the implementation of Pilot Institute; however, these problems and difficulties, which varied from one university to another, have been gradually removed or improved by the specific administrative measures taken by the respective universities. All of these universities have formulated both short and long-term plans of one kind or another, specifically designed to deal with their problems an difficuties arising from the implementation of Pilot Institute. It is particularly note worthy that with the implementation of Pilot Institute these universities have improved their educational programs and that they continue to make further improvements. As for Hong-Ik University, it has made a great deal of progress in the improvements of its over-all educational environment, especially in the past few years. It has formulated and applied a number of specific strategies in areas that were considered deficient and inadequate. This study finds that the University continues to make further improvements in all areas. It is recommended on the basis of the findings of this study that Hong-Ik University initiate the Pilot Institute in the near furture at a time when it is deemed appropriate, as determined by the University authorities, with a suggestion that it make further studies in this matter, while maintaining a closer contact with the other Pilot Institute universities in the hope that it can draw some benefits from their experiences in the implementation of Pilot Institute.
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