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조정대,이상섭,김양배,홍진후 한국고분자학회 2013 Macromolecular Research Vol.21 No.12
This paper reports on the relationship between the photocure kinetics and the morphological properties of UV-curable acrylate-based polymer dispersed liquid crystal (PDLC) systems with the various 2-ethylhexylacrylate (2-EHA) and 2-ethylhexylmethacrylate (2-EHMA) contents using photo-differential scanning calorimetry (photo-DSC), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). Photo-DSC analysis using an autocatalytic kinetics model demonstrated that the cure extent and cure rate gradually decreased and then leveled off as the concentration of 2-EHMA increased up to 25 wt%, which was well confirmed by using FTIR spectroscopy. The morphological observations revealed that increasing the 2-EHMA content increased the size of the LC droplets within the acrylate-based polymer matrix. Notably, there was a marked increase in the number of LC droplets larger than 10 μm in PDLC composites containing more than 20 wt% 2-EHMA, suggesting that the addition of more than 20 wt% 2-EHMA to the acrylate-based PDLC compounds is not desirable. The presence of 2-EHMA clearly affected the photocure behaviors of acrylate-based PDLC compounds, which interestingly means that the slow reactivity of methacrylate monomer could be simply used to control the phase separation rate and the microstructures of LC droplets of acrylate-based PDLC systems.
조정대,정재헌,임창복 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.1
This paper intends to study the characteristics of urban contextual aspect in Korea Multi-dwelling housing estate through the analysis of typical housing for each typology. As result, Six Types are classified in this study. as follows : Fence type, Semi-public space provided type, Slreet Markets type, Interaction between streeE and market, Provided frontal markets type, Alienated markets from urban housing estate. These six interpretative attitudes to the street in planning and design of housing estate have been found by regarding the street as the part of residential space type and regarding the street. as the boundary type. Korea urhan collective housing must be accepted acceptance of existing urban conEext, revitalization of stnaet space far civilian's community, including space of street, etc.