DENG Ze-long,YANG Qing-hua,LIU Neng-mo,LIN Qin-bao.Identification of Physically Recycled Polyester by UV-Vis Spectroscopy Combined with Chemometrics[J].Journal of Instrumental Analysis,2025,44(12):2614-2618.
DENG Ze-long,YANG Qing-hua,LIU Neng-mo,LIN Qin-bao.Identification of Physically Recycled Polyester by UV-Vis Spectroscopy Combined with Chemometrics[J].Journal of Instrumental Analysis,2025,44(12):2614-2618. DOI: 10.12452/j.fxcsxb.250313191.
Identification of Physically Recycled Polyester by UV-Vis Spectroscopy Combined with Chemometrics
Due to the high similarity in molecular structure and physicochemical properties between virgin and recycled polyester,rapid discrimination remains challenging. To address this issue,this study employed ultraviolet-visible spectroscopy(UV-Vis) combined with chemometric techniques. By optimizing pretreatment conditions such as solvent selection,ultrasonication time,and sample quantity,dichloromethane was identified as the optimal extraction solvent. The optimal discrimination performance was achieved under conditions of 1 hour ultrasonication and 1 g sample size. Under these optimized parameters,UV-Vis spectra of 53 polyester samples were collected,revealing distinct characteristic absorption peaks for recycled polyester in the wavelength ranges of 500-680 nm and 320-380 nm. Further analysis using principal component analysis(PCA) and orthogonal partial least squar
es-discriminant analysis(OPLS-DA) enabled the establishment of classification models. The OPLS-DA model demonstrated high stability and accuracy,with cumulative fit parameters
R
²
Y
(cum)=0.927 and predictive parameter
Q
²(cum)=0.907. The PCA model achieved a 93.3% classification accuracy for test samples. These results confirm the robust fitting and predictive capabilities of the proposed method,which effectively discriminates physically recycled polyester samples.
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