Thermos-responsive PMMA-b-P(NIPAAm-co-RhBN2AM) Diblock Copolymers Synthesized by RAFT Polymerization and Application of Electrospun Nanofibers

• Main Authors: Chien-Cheng Chen, 陳健誠
• Other Authors: Chi-Ching Kuo
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/46sba7

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 103 === In this study, we prepared electrospun nanofibers from multifunctional diblock copolymers of PMMA-b-P(NIPAAm-co-RhBN2AM). The materials of MMA, NIPAAm, RhBN2AM were deigned to the hydrophobic(to prevent the fibers dissolved in aqueous solution), amphiphilic/temperature sensitive, pH/metal ions(Hg2+)-responsive, respectively. The diblock copolymers were synthesized by via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization and then prepared to form ES nanofibers using the different electronspinning parameters. It was observed that the variation of morphologies on different operated conditions from SEM. We explored the various pH/metal ions (Hg2+)-responsive concentrations on photophysical properties of the ES fibers immersed into aqueous solution with different pH and temperature. The fluorescent emission of 580 nm was gradually increased with increasing [H+] concentration (from pH=7 to pH=2) due to the fluorescent monomer sensor moiety. When pH=2, we can distinguish clearly the brightest fluorescent emission achieved by naked eye. Due to the thermos-responsive properties of NIPAAm, when the temperature was increased, there will be quench in fluorescent emission. With increasing [Hg2+] concentration of the aqueous solution, the quenched fluorescent emission also was observed. Our results showed that the multi-fuctional ES fibers have a potential in relative applications, such as filters, bio-sensor and sensory devices.