高湿度下具有荧光指示功能的PET复合膜的制备与性能

Preparation and performance of PET composite membrane with fluorescence indication function in high humidity environment

为了制备出能在高湿度、易结雾环境下可持续发光的薄膜,以聚对苯二甲酸乙二醇酯(PET)膜为基底,将具有优异疏水功能的新型稀土发光配合物和聚甲基丙烯酸甲酯(PMMA)均匀分散制成发光涂覆液,通过涂覆刮膜技术,制备出PET-PMMA发光复合膜,并对其进行测试表征。荧光分光光度计和共聚焦显微镜测试的结果表明:发光材料占聚合物PMMA的质量分数为1.50%时所制备的PET发光膜具有良好的表面均匀性和最佳的荧光性能,荧光强度可达到9979 a.u.,在不同激发波长下PET-PMMA发光复合膜均可以显现出发光材料中Eu3+的特征荧光发射峰;测得发光复合膜的最佳紫外激发波长为350 nm,在最佳激发波长下发光复合膜具有较好的色纯度;通过对比发光复合膜浸泡在水溶液7 d内每天的荧光强度值,发现在发光材料仅有1.50%的前提下,样品的荧光强度损失仅有5%,这表明所制备的发光复合膜遇水易猝灭的弊端得到极大改善,这为PET农膜在潮湿、易结雾环境下实现长期稳定的荧光指示功能提供了重要基础。

In order to prepare a film that can continuously emit light in a high humidity and fogging environment,a new rare earth luminescent complex with excellent hydrophobic function and PMMA was uniformly dispersed to make a coating solution based on PET film,and PET-PMMA luminescent composite film was prepared by coating wiping film technology,which was tested and characterized.The results of fluorescence spectrophotometer and confocal microscopy test show that the PET light-emitting film prepared when the luminescent material accounts for 1.50%of the mass fraction of polymer PMMA has good surface uniformity and the best fluorescence performance,and the fluorescence intensity can reach 9979 a.u.PET-PMMA luminescent composite films can show the characteristic fluorescence emission peaks of Eu3+in the starting light material at different excitation wavelengths.At the same time,the optimal ultraviolet excitation wavelength of the luminescent composite film was 350 nm,and the luminescent composite film has good color purity at the optimal excitation wavelength.By comparing the fluorescence intensity values of the luminescent composite film immersed in aqueous solution for one week,it was found that the fluorescence intensity loss of the sample was only 5%under the premise that the fluorescence loss of the material was only 1.50%.This shows that the disadvantages of the prepared luminescent composite film being easily quenched when exposed to water have been greatly improved,which provides an important basis for the long-term stable fluorescence indication function of PET agricultural film in humid and foggy environment.