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용액 중에서 phenyl dimethyl ketar과 1-hydroxy cyclohexyl phenyl ketone을 광개시제로한 MMA의 광중합시 산소가 미치는 영향
서차수 釜山工業大學 1987 論文集 Vol.29 No.-
Methyl methacrylate (MMA)를 묽은 xylen 용액 중에서 phenyl dimethyl ketar(PDK)와 1-hydroxy cyclo hexyl phenyl ketone(HHPK)를 광개시제로하여 광중합성에 미치는 산소의 영향을 조사하였다. 질소 gas하에 반응시킨 것 보다 산소하에서 반응시킨 경우 radical의 소모가 더 많았다. 즉 산소의 영향으로 같은 중합 효율시 개시제 량이 5배 정도 더 필요하였다.
Acrylic Urethane수지의 경화속도에 관한 연구
서차수 釜山工業大學校 1995 論文集 Vol.37 No.-
UV-curable acrylic urethane resins widely used in the coating industry possess a distinct feature of rapid cure rate, which transforms a liquid resin almost instantly into a solid polymer. However, the cure rate and physical properties of the cured films are affected in a complicated fashion by the choice of photo-initiator, monofunctional monomer, polyfunctional monomer and polymer, and the proportion in which they are combined. Hence, relatively few systematic studies have been carried out on the UV-curable resin system so far. The effects of the molcular weight (MW) of the reactive oligomer, the functionality (f) and content of the reactive monomer, and the type and amount of the photo-initiators on the curing rate and physical properties of cured films were investigated in the present study using the UV radiation. The conclusions drawn from this study are as follows. In the curing reaction of HDDA (f-2) with three kinds of urethane acrylate oligomer (UAO) differing in MW, the initial rate of increase in % conversion of carbon-carbon acrylate double bonds, as determined by the change of the IR absorption peaks at 810 cm1 with UV irradiation time suing a time driver, was in the order of UAO-2>UAO-3>UAO-1 whereas the maximum % conversion of acrylate double bonds and %gel fraction approached about 70% and 100%, respectively, for all three cases. On the other hand, in the reaction of UAO-2 (MW=1200) with mono-, di-, and tri- functional monomers the initial conversion rate of acrylate double bonds decreased in the order of TMPTA(f=3)> HDDA(f=2)> EHA(f=1), but at a later reaction stage (above 60% conversion) the TMPTA case showed the lower reaction rate than HDDA probably due to the effect of molecular constraints imposed by highly corss-linked points. The % gel fractions approached nearly 100% at a final reaction stage for all three cases, the initial rate of increase being the greatest for TMPTA. The TMPTA system exhibited the strongest tensile strength, but the poorest elongation as expected. Tensile properties (strength and elongation) did not vary greatly with monomer content until 40%, but after then decreased with increasing monomer content because of the homopolymers produced in large amounts.
무황변 Acrylic Urethane 수지의 경화속도에 대한 연구
서차수,박천욱 ( C . S . Suh,T . W . Park ) 한국공업화학회 1994 공업화학 Vol.5 No.4
The catalytic effects of carboxylic acid and dibutyltin dilaurate(DBTL) on the curing rate of acrylic polyol with isocyanate prepolymer were investigated. In this work, reaction of a biuret type aliphatic isocyanate with acrylic polyol follows the second order reaction in the thin film state. Carboxylic acid of acrylic polyol has a strong catalytic effect on the isocyanate groups, and influences greatly on curing rate, also DBTL is more effective catalysis on acrylic polyol without carboxylic acid than with carboxylic acid.