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폴리에틸렌테레프탈레이트의 겔투과 크로마토그래프법을 위한 새로운 공용매계
윤성로,류동일,하완식,Yun, Seong-Ro,Ryu, Dong-Il,Ha, Wan-Sik The Korean Fiber Society 1985 한국섬유공학회지 Vol.22 No.6
겔 쿠과 크로마토그래프법(GPC)에 의하여 폴리에틸렌테레프탈레이트(PET)의 분자량 분포를 결정함에 있어 테트라클로로에탄(TCE)과 오르토-디클로로벤젠(ODCB)의 혼합액으로 이루어지는 새로운 공용매계를 발전시켰다. 9개의 방향족 2성분 혼합 용매에 대하여 3차원 용해도파라미터를 나타내는 공간에서의 PET의 방향족 잔기와 용매 사이의 최소 거리를 계산했다. 검토한 혼합 용매중에서 TCE/ODCB 혼합 용매(부피비 50/50)에 대한 위 공간에 있어서의 계산 거리가 가장 작았다. TCE/ODCB 혼합 용매는 14,000이하의 분자량을 갖는 PET에 대한 GPC 용매로서 30~32$^{\circ}C$에서 고분자의 손상없이 사용될 수 있음을 밝혔다. Anew co-solvent system comprising a mixture of tetrachloroethane (TCE) and o-di-chlorobenzene(ODCB) has been developed for determining the molecular weight distribution of poly(ethylene terephthalate) (PET) by gel-permeation chromatography(GPC). Minimum distances between aromatic residue of PET and solvent in the space representing three dimensional solubility parameter were calculated for nine aromatic binary solvent mixtures. The calculated distance in the space for TCE/ODCB mixture (50/50 in volume ratio) was minimum among the solvent mixtures examined. It was found that the TCE/ODCB mixture can be used as a GPC solvent for PET having molecular weight of less than 14,000 at 30∼32$^{\circ}C$ without polymer degradation.
윤성로,조영석,김창식,김철성 한국과학교육학회 1989 한국과학교육학회지 Vol.9 No.1
General Physics CAI Program was developed for university science and engineering student. The program was restricted in the field of mechanics and was mainly aimed for individual tutorial. This project was supported by Government. Department of Education, physics attending their general physics classes in university. The program was written in BASIC and constructed by frame. 4 professors and 6 graduate students were involved in the project Summary of this study is as follows. 1. The theory of CAI was illuminated from a new point of view to enhance usefullness of CAI. Also the structure of frame type CAI was studied. 2. The program was developed as follows 1) The program consisted of main program, pretest routine. tutorial routine, final test routine, and several other routines for program control. Whole program was written in BASIC. 2) 20 problems for pretest, 90 problems and subsequent hints and solutions for tutorial. 20 problems for final test were developed. 3) According to student's pretest result, tutorial course was routed through several different courses which contain different number of problems. 4) The expected rate of achievement for final test was set to 75%. 5) Data of students response to problems including number of tries and time used were recorded for the purse of achievment analisys. 3. 22 students went through whole course and the results were as follows. 1) Pretest marks were widly distributed from 20 points to 100. It means that achievement of high school physics course were not enough. 2) Throuthout tutorial course. students who had got higher mark in pretest answered correctly in the first trial at a higher rate of 78%. Overall rate of correct answer in the second trial was distributed appropriatly. 3) Average mark of final test was 78.8 points, rather a higher rate of achievement than expected. This means that the program was constructed well.