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首页> 外文期刊>Journal of Applied Polymer Science >Experimental investigation of continuous conductivity measurements during emulsion polymerizations having unstable/high-fouling reaction mixture
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Experimental investigation of continuous conductivity measurements during emulsion polymerizations having unstable/high-fouling reaction mixture

机译：具有不稳定/高污染反应混合物的乳液聚合过程中连续电导率测量的实验研究

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Conductimetry is one of the online monitoring techniques employed for emulsion polymerization reactions, which can give continuous information about nucleation and growth of particles. The most important factor affecting conductivity sensors performance especially contacting (resistance) types is fouling. To investigate the consequences of fouling, four monomers with different tendencies for fouling were selected: methyl methacrylate, butyl acrylate, styrene, and butadiene. Two types of conductivity sensors were also selected to continuously measure conductivity: a two-electrode sensor and an inductive sensor, and the performance of these sensors were evaluated based on some criteria such as conductivity behavior, amount of fluctuation, change in cell constant, repeatability, and status of the minimum of conductivity. The results obtained from the contacting sensor showed that fouling significantly decreased the performance of this sensor in different ways even in reaction mixtures having moderate fouling rates. However, the inductive conductivity sensor provided the possibility of reliably measuring conductivity during very high-fouling and highly unstable emulsion polymerizations with very good repeatability. The capabilities of this sensor also allowed an exact recognition of the important points in the conductivity curves particularly the minimum of conductivity. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44446.
机译：电导是用于乳液聚合反应的在线监测技术之一，其可以提供有关颗粒的成核和生长的连续信息。影响电导率传感器性能的最重要因素尤其是接触（抵抗）类型是污垢。为了调查污垢的后果，选择了四种具有不同污垢倾向的单体：甲基丙烯酸甲酯，丙烯酸丁酯，苯乙烯和丁二烯。还选择两种类型的电导率传感器以连续测量导电性：双电极传感器和电感传感器，以及这些传感器的性能，基于诸如电导率行为，波动量，电池常数的变化，可重复性，可重复性，可重复性以及导电性最小的状态。从接触传感器获得的结果表明，即使在具有中等污垢速率的反应混合物中，污垢也以不同方式显着降低了这种传感器的性能。然而，电感电导率传感器提供了在非常高污垢和高度不稳定的乳液聚合期间可靠地测量导电性的可能性，具有非常好的可重复性。该传感器的能力还允许精确地识别导电曲线中的重要点，特别是导电性最小。 （c）2016 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2017,134,44446。

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