Analysis of Structural Features of Ethylcellulose/Dioctyl Phthalate Solutions and Gels by Rheological and Light Scattering Measurements

• Main Authors: LIAO, HSIANG-YU, 廖祥宇
• Other Authors: HUA, CHI-CHUNG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/7zzfdq

碩士 === 國立中正大學 === 化學工程研究所 === 107 === In this research, the viscoelastic behavior and intrinsic properties of ethylcellulose (EC) of varying concentration (0.02–3 wt%) in dioctyl phthalate (DOP), a commonly used solvent in industry, were systematically explored by combined rheology, capillary and light scattering analyses. Using the viscosity versus concentration plot, the EC solutions can be categorized into three characteristic regimes (dilute, semi‐dilute, and concentrated) on the basis of scaling laws. An important feature of the EC solutions investigated is that the polymer chains form aggregates and turn into gel, depending on the EC concentration and system temperature. Detailed dynamic and structural features during sol–gel transition were resolved by combined light scattering and rheological analyses. The results provide essential insight into future applications of the EC solution and gel.