Fluorescent Copolymers with Aggregation-Induced Emission: Synthesis, Nanofiber Fabrication and Sensing Applications

• Main Authors: Sing-HuaSu, 蘇星華
• Other Authors: Wen-Chung Wu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/3xequw

碩士 === 國立成功大學 === 化學工程學系 === 105 === Electrospinning (ES) is a simple and versatile method for manufacturing continuous nanofibers. ES nanofibers with their large surface-to-volume ratio are widely used for various applications. In this study, novel fluorescent ES nanofibers are successfully prepared from random copolymers of poly(NIPAAm-co-NMA-co-(PPS-HEMA)) through free radical polymerization and followed by electrospinning for optical applications. PNIPAAm segments with thermo-responsive properties exhibit a hydrophilic-hydrophobic change as the temperatures varied. PNMA segments with chemically cross-linking moiety stabilize the morphology of nanofibers in the solution after thermal cross-linking. PPS-HEMA segments with aggregation-induced emission (AIE) phenomenon show much weaker emission in a good organic solvent. Upon aggregate formation, the emission of these AIE dyes is induced to increase by the effect of the restricted intramolecular rotation. The morphology of nanofibers before/after cross-linking were observed by Field Emission Scanning Electron Microscopy (FE-SEM). The high surface-to-volume ratio of ES nanofibers enhanced the sensitivity compared with that of spin-coating film. Furthermore, the optical measurements of ES nanofibers were reusable for several times.