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권해원(Kwon Hae-Won),박희곤(Park Hee-Gon),이진우(Lee Jin-Woo),김유진(Kim Yoo-Jin),배연기(Bae Yeoun-Ki),이재삼(Lee Jae-Sam) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The method of managing variations in temperatures between the interior and exterior of a mass member with dominant interior restrictions displays a higher degree of utilization than other crack reduction techniques by occurrence of hydration heat. The thermos curing method is a kind of the crack reduction techniques and in here the important point is the properties of surface curing material. Therefore this experimental research grasps their properties through the various surface curing materials. In addition it differs from ones in the past in examining the crack ratio for it puts variability of concrete tensile strength according to time dependent into consideration and in modeling, then deduces an interpretation. Moreover, a comparative analysis against data measured from a mock-up test specimen was carried out to investigate the cause for any disparities.
Toluene Diisocyanate/KOH 촉매작용에 의한 2-Pyrrolidone의 음이온 중합
정발,권기성,최삼권,유문삼,Bal Jung,Ki Sung Kwon,Sam Kwon Choi,Mun Sam Ryoo 대한화학회 1983 대한화학회지 Vol.27 No.1
TDI (Toluene Diisocyanate)/KOH 촉매작용에 의한 2-pyrrolidone의 음이온 중합에 있어서 TDI / KOH 몰비율, KOH의 농도, 온도 및 시간이 중합에 미치는 영향을 조사하였다. TDI / KOH 몰비율이 0.25일 때 중합속도가 가장 빠르고 전환율도 높았으며, 또 KOH의 농도가 5몰퍼센트일 때 가장 높은 전환율과 점도가 얻어졌다. 중합온도는 $30^{\circ}C$인 경우가 $50^{\circ}C$에 비해 전환율이 높았으며 점도도 높았다. 최소자승법으로 계산하여 구한 중합속도상수($k_p$)의 값은 $30^{\circ}C$일 때 $57.53 {\ell}/mole{\cdot}min$였고, $50^{\circ}C$일 때 $52.36{\ell}/mole{\cdot}min$였다. Anionic polymerization of 2-pyrrolidone was carried out by TDI (Toluene Diisocyanate)/KOH catalysis. The effects of TDI / KOH mole ratio, KOH concentration, temperature and time on polymerization were investigated. It was observed that the highest rate of polymerization and maximum conversion were obtained when TDI / KOH mole ratio was about 0.25. The maximum conversion and the highest viscosity were obtained when the concentration of KOH was 5 mole percent. It was also found that the rate of polymerization and inherent viscosity at $30^{\circ}C$ were higher than those at $50^{\circ}C$. The rate constant ($k_p$) of polymerization was determined by least square method; the values of kp obtained were $57.53{\ell}/mole{\cdot}min\;at\;30^{\circ}C$ and $52.36{\ell}/mole{\cdot}min\;at\;50^{\circ}C$, respectively.