Bulk Etching of PET Studied by Spectrophotometer

• 作者: DuanJinlai H.Koshikawa M.Yoshida SunYoumei Y.Maekawa ZhuZhiyong
• 来源期刊: 近代物理研究所和兰州重离子加速器实验室年报：英文版
• 学科: 化学
• 关键词: OH UV-VIS CO PET
• 年，卷（期）: 2003,（1）
• 页码范围: 65-66
• 页数: 2页
• 分类号: O643.1

摘要

UV-VIS spectra of poly(ethylene terephthalate) (PET) solutions formed by etching PET in NaOH solution were analyzed with respect to the etching time. Two bands centered at 4.45 eV and 5.11 eV can be well separated (Fig.l). They are attributed to π→π^n transition from the chromophore of-O-CO-C6H4-CO-O-which is the main origin of optical absorption in the wavelength range from 240 nm to 320nm, both for the solid and dissolved PET. As shown in Fig.2, the integrated absorbance (A) of the two bands as well as weight loss of PET after etching in 0.74 N NaOH at 40°C increase linearly with etching time. A linear relationship between absorptions of the two bands and weight loss of PET in NaOH solution can therefore be established. As less than 2μg/ml of PET dissolved in NaOH solution can be resolved by spectrophotometer, it supplies a sensitive way to study the etching process even after very short time of etching.