Investigation of aggregation properties of dilute poly[2-methoxy-5-(2’-ethylhexyloxy)-1,4- phenylenevinylene] solutions in shearing flow by in situ viscometric/flow turbidity measurements

• Main Authors: Chih-Jung Lin, 林志榮
• Other Authors: Chi-Chung Hua
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/87098528667812186050

碩士 === 國立中正大學 === 化學工程所 === 96 === Semiconducting conjugated polymers play an important role in both PLED displays and polymer solar cells. In practical processing, it is essential to control the state of polymer aggregation in the precursor solution as well as in the dried film. In this work, we conducted in-situ viscometric/flow turbidity measurements to study the aggregation properties of dilute MEH-PPV solutions under static or shearing-flow conditions. At various polymer concentrations, consistency was generally noted between the reduced viscosity and the Mie radius obtained from in-situ viscometric/flow turbidity measurements and the hydrodynamic radius estimated from dynamic light scattering measurement. The experimental results suggested that the average aggregate size increases and the stability decreases with decreasing polymer concentration. Overall, the present study suggested that in-situ viscometric/flow turbidity measurements are an ideal means to investigate the aggregation properties of MEH-PPV solutions.