http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서경도,김진웅 한국공업화학회 1998 응용화학 Vol.2 No.2
Seeded dispersion polymerization of monodisperse polystyrene particles crosslinked with the urethane acrylate was carried out to obtain highly crosslinked composite particles. A thermodynamic model of this system was designed and compared with the experimental results. It was found that the effective absorption of the 2^nd monomer (divinylbenzene (DVB)) to the seed particles mainly depended on the sizes of seed particles and the DVB monomer droplets. Therefore, when small DVB emulsions were prepared, the DVB monomer was possibly diffused into the seed particles to about 60 times. Finally highly crosslinked large polymer particles were obtained.
Dispersion Polymerization 을 이용한 단분산성의 가교 Poly (methyl methacrylate) 입자의 제조
김진웅,서경도 한국공업화학회 1998 응용화학 Vol.2 No.1
Highly monodisperse poly(methyl methacrylate)(PMMA) microparticles crosslinked with urethane acrylates containing carboxylic groups were produced by dispersion polymerization in methanol solution. Different from conventional crosslinkers, the urethane acrylate employed as a crosslinker showed an excellent effect on maintaining the monodispersity of PMMA microparticles even in the moderate crosslinker concentration (to about 10 wt%). This was believed that the urethane acrylate helped forming the monomer-swellable surface of primary particles, because of its structurally long tetramethylene oxide groups in its molecule. However, at high concentration and low molecular weight of the urethane acrylate, bimodal distributions were observed, which was attributed to the serious increase of the crosslinking density.
김진웅,서경도,정원욱 한국공업화학회 1998 응용화학 Vol.2 No.1
Water-borne epoxy acrylate system using a urethane acrylate anionomer as a cotabilizer was prepared for an application of ultraviolet(UV) curing. By observing the optical microscopy and gravimetric stability, it was confirmed that the urethane acrylate anionomers incorporated have a drastic effect on costabilizing the interface of epoxy acrylate and water/ethanol mixture (80/20, w/w). This was possible by the structurally designed urethane acrylate anionomer, containing a hydrophobic soft segment and two hydrophilic ionic segments in a molecule. In addition, when cured, the epoxy acrylate film displayed the improved toughening properties, because of the formation of rubber domains of the urethane acrylate anionomers caused by the difference of solubility between the urethane acrylate and epoxy acrylate matrix.