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首页> 外文期刊>Journal of Applied Polymer Science >Visualization of hydrolysis in polylactide using near-infrared hyperspectral imaging and chemometrics
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Visualization of hydrolysis in polylactide using near-infrared hyperspectral imaging and chemometrics

机译：使用近红外高光谱成像和化学计量器可视化产物中的水解

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摘要

The hydrolysis of polylactide (PLA) occurs during melt processing, leading to product defects in, for example, appearance and mechanical properties. Hydrolyzed PLA products, whose mechanical properties were deteriorated, must be detected during processing to ensure the quality control of PLA products. In this study, near-infrared (NIR) hyperspectral imaging was applied for evaluating the extent of hydrolysis. NIR spectra in the wavelength range from 1200 to 1600 nm were changed by (1) hydrolysis induced by molding and (2) crystallization induced by annealing. The changes in the NIR spectra mediated by these two factors were distinctly different but overlapping, leading to difficulty in evaluating PLA at only a single wavelength. Partial least squares regression was introduced for detecting the hydrolyzed PLA. NIR imaging combined with the constructed partial least square models clearly visualized the differences in the extent of hydrolysis in hydrolyzed PLA under varying degrees of crystallization. (C) 2017 Wiley Periodicals, Inc.
机译：在熔融加工过程中，在熔融加工过程中发生挥之不键（PLA），导致例如外观和机械性能的产物缺陷。水解PLA产品，其机械性能恶化，在加工过程中必须检测到，以确保PLA产品的质量控制。在该研究中，近红外（NIR）高光谱成像用于评估水解程度。波长范围内的NIR光谱从1200-1600nm的通过模塑和通过退火诱导的结晶诱导的（1）改变（1）水解。这两个因素介导的NIR光谱的变化明显不同但重叠，导致仅在单个波长下评估PLA。引入局部最小二乘回归用于检测水解的PLA。 NIR成像与构造的部分最小二乘模型结合，清楚地可视化了在不同程度的结晶下水解PLA水解程度的差异。 （c）2017 Wiley期刊，Inc。

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