PTFE Modification Using E-beam irradiation

• Main Authors: Ting-Yun Wang, 汪庭韻
• Other Authors: YING-LIN LIOU
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/64880717137996923206

碩士 === 中原大學 === 化學工程研究所 === 98 === Modification of poly(tetrafluoroethylene) (PTFE) has been carried using electron beam (EB) irradiation and post-radical polymerization. PTFE has been irradiated with EB to generate radicals on PTFE films, which has been applied as initiating sites for post-radical graft polym -erization using sodium 4-styrenesulfonate (Nass) and 3-sulfopropylmeth -acrylate potassium salt (SPM) as monomers. The effects of irradiation powers of EB, the grafting reaction process, and the swelling of PTFE films on the efficiency of PTFE modification have been examined. The optimum irradiation powers of EB could be 0.3 Mrad. High powers of EB might result in cross-linking reactions of PTFE chains during irradiation. The grafted PNass and PSPM chains have been characterized with Fourier Transform Infrared Spectroscopy and reductions of water contact angles of PTFE film surfaces. The grafted chains of PNass and PSPM could be transformed into acid forms by treatments of hydrochloride, making the modified PTFE films become polyelectrolytes with proton conducting characteristics. The presence of sulfonic acid groups of the acidified grafted PTFE films has been characterized with their high ion exchange capacity OF ABOUT 1.6-2.2 meq/g. The prepared modified PTFE films might be potentially applied for proton exchange membranes for fuel cells.