应用化学2025，Vol.42Issue(10)：1323-1334,12.DOI:10.19894/j.issn.1000-0518.250188
利用荧光寿命测量聚乙烯醇缩丁醛的玻璃化转变温度
Probing the Glass Transition Temperature of Poly(vinyl butyral)Using Fluorescence Lifetime
摘要
Abstract
Poly(vinyl butyral)(PVB)is widely used in laminated glass due to its excellent optical transmittance and adhesion.Measuring the glass transition temperature(Tg)of amorphous polymers is critically important.In this study,rhodamine B was grafted onto PVB chains as a fluorescent probe.By combining laser confocal microscopy with fluorescence lifetime imaging(FLIM),the Tg of PVB was characterized using the intersection point of fluorescence lifetime versus temperature curves.Comparison with differential scanning calorimetry(DSC)results showed that the Tg of the blend with mass fraction 2%PVB-Rhb measured by fluorescence lifetime was in perfect agreement with that obtained via DSC,thus verifying the accuracy and sensitivity of the fluorescence method for Tg determination.Concurrently,this method is extended to thin film systems.The effects of fluorescent probe concentration and sample thickness on Tg were systematically investigated,revealing a quantitative correlation between the film thickness and Tg.Tg increased with reduced PVB film thickness.These results demonstrate FLIM as a robust tool for polymer Tg measurement,with advantages for characterization of substrate-supported polymer films and polymers in confined environments.关键词
激光共聚焦显微镜/荧光寿命成像/超薄膜/玻璃化转变温度Key words
Laser confocal microscopy/Fluorescence lifetime imaging/Ultra-thin films/Glass transition temperature分类
化学化工引用本文复制引用
李彧,穆娇,王笃金,刘国明..利用荧光寿命测量聚乙烯醇缩丁醛的玻璃化转变温度[J].应用化学,2025,42(10):1323-1334,12.基金项目
国家自然科学基金(No.21922308)资助Supported by the National Natural Science Foundation of China(No.21922308) （No.21922308）
