| 학회 | 한국화학공학회 |
| 학술대회 | 2004년 봄 (04/23 ~ 04/24, 공주대학교) |
| 권호 | 10권 1호, p.40 |
| 발표분야 | 고분자 |
| 제목 | Synthesis of UV curable polyurethane acrylate and their phase separation behaviors |
| 초록 | To investigate the microphase separation behaviors in polyurethane acrylates, one of the critical factors for polymer dispersed liquid crystal (PDLC), ultra-violet (UV) curable polyurethane acrylates were prepared. Twelve different polyurethane acrylates were prepared with varying soft-segment molecular weight, types of reactive diluent, and amount of reactive diluent. Polyurethane acrylates films were characterized by FT-IR, DSC, and XRD. Swelling test was also performed. The microphase separation of the urethane segments, which is mainly governed by the soft-segment length and compatibility of hard-segments and acrylates due to their similar polarity and hydrogen bonding, is a key parameter to control the ultimate properties of the UV curable polyurethane acrylates. With increasing soft-segment molecular weight, the polyol glass transition shifts to lower temperatures. The microphase separation behaviors increased with increasing cohesive force between hard-segments. Specially, aromatic diisocyanate TDI with relatively high cohesive force showed higher microphase separation than aliphatic component IPDI. The reactive diluent phase is more compatible with the hard-segments of polyurethane, rather than the soft-segments. |
| 저자 | 박미희, 권진욱, 박선아, 이춘근, 한학수 |
| 소속 | 연세대 |
| 키워드 | polyurethane acrylate; microphase separation; hard-segment; soft-segment; polymer dispersed liquid crystal; UV curing |
| 원문파일 | 초록 보기 |
