| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.232 |
| 발표분야 | 기능성 고분자 |
| 제목 | Novel Thermosenstive Poly(NDPPA-co-NIPAM)s and Their Sol-Gel Phase Transiton Behaviors |
| 초록 | Introduction Recently polymer and organic gels have received much attention becauseof their unique properties indicating sol-gel or volume phase transition behavior by external stimuli such as pH, temperature, ionic strength, electric field, etc. 1-2 Among them, thermo-responsive polymer gels derived from biodegradable triblock copolymers and N-isopropylacrylamide (NIPAM) based polymers have been extensively studied due to their various biomedical applications. In this work, we report the synthesis and characterization of novel poly(N-substituted acrylamides) and their temperature-dependent sol-gel transition behavior in an aromatic solvent. Experimental As a new N-substituted acrylamide monomer, we prepared m-NDPPA and p-NDPPA, which are shown in Figure 1.3 Results and Discussion The monomers were polymerized with a radical initiator to produce corresponding homo- and co-polymers with NIPAM. Weight average molecular weights of the polymers were in the range of 11,000 ~ 27,000. DSC and TGA measurements confirmed that the polymers had excellent thermal properties. In addition, sol-gel phase transition behavior and upper critical solution temperature (UCST) were measured by a vial tilting method and a dynamic light scattering, respectively. As a result, all the homopoly(N-substituted acrylamides) and the corresponding copolymers with NIPAM showed a thermo-reversible sol-gel phase transition phenomenon between 65 ~ -2 ℃ in an aromatic solvent such as benzene or toluene. Figure 2 exhibits a representative phase transition behavior for the homopoly(NDPPA) and copoly(NDPPA/NIPAM) with different composition ratio. The phase transition temperature was dependent not only on the composition ratio of NDPPA in the copolymer but also on the kind of solvent. Figure 1. Structure of new N-substituted acrylamide monomers. Figure 2. Change of the transmittance of NDPPA/NIPAM copolymer (m-NDPPA : NIPAM = 7 : 3) solution in toluene with temperature. References 1. Osada, Y; Okuzaki, H; Hori, H. Nature, 1992, 325, 242. 2. Yasuda, Y; Takebe,Y; Shirota,Y. Adv. Mater., 1996, 8(9), 740. 3. Han, Y. K; Lee, E. A; Keum, S.H; Kim, H. S; Cho, B. k; Kim, S.C., Korea Patent Application # 2003-0089214 (December 10, 2003). |
| 저자 | 김형완, 이민기, 한양규 |
| 소속 | 한양대 |
| 키워드 | 졸-겔 상전이 특성; NIPAM공중합체; 새로운 아크릴아미드 단량체 |
