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In-line fiber-optic near-infrared spectroscopy: Monitoring of rheological properties in an extrusion process. Part I.

机译:在线光纤近红外光谱:在挤出过程中监测流变性能。第一部分

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摘要

In-line monitoring of chemical processes is desired for its numerous advantages, such as lesser waste, lower developmental cycle time, and lesser costs. In this study, a methodology is presented for estimating polymer rheological properties using fiber-optic near-infrared (NIR) spectroscopy. Predictive calibration models are developed for simultaneous, in-line monitoring of polymer melt flow index (MI) and comonomer concentration for a system of poly( ethylene vinyl acetate) copolymers. The NIR spectra of flowing, molten poly( ethylene vinyl acetate) (EVA) copolymers are collected in a flow cell attached to a single-screw extruder. Multivariate statistical regression analysis is presented for correlation of MI and absorbance in the methylene (C--H) stretch, first overtone NIR wavelength region (1620-1840 nm). Results for simultaneous, real-time monitoring of MI and comonomer composition are discussed in detail. (C) 1998 John Wiley & Sons, Inc. [References: 17]
机译:需要化学过程的在线监测,因为其具有许多优点,例如更少的浪费,更少的开发周期时间和更少的成本。在这项研究中,提出了一种使用光纤近红外(NIR)光谱估算聚合物流变性能的方法。开发了预测校准模型,用于同时在线监测聚(乙烯乙酸乙烯酯)共聚物体系的聚合物熔体流动指数(MI)和共聚单体浓度。流动的熔融聚(乙烯乙酸乙烯酯)(EVA)共聚物的近红外光谱收集在连接到单螺杆挤出机的流通池中。提出了多元统计回归分析,以分析亚甲基(CH)拉伸,第一泛音NIR波长区域(1620-1840 nm)中MI与吸光度的相关性。同时讨论了MI和共聚单体组成的实时同步监测结果。 (C)1998 John Wiley&Sons,Inc. [参考:17]

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