Evaluation of Polyesterimide Nanocomposites Using Methods of Thermal Analysis

[摘要] Polyesterimide resin applied for winding impregnation has been modified by incorporating the hydrophilic and hydrophobic nanosilica, montmorillonite and aluminium oxide. For assessment of the resins in liquid and cured states thermoanalytical methods TG/DSC were used. For pure and nanofilled resins the results of investigation of AFM topography, bond strength, dielectric strength and partial discharge resistance have been also presented. It was found that dielectric and mechanical properties of polyesterimide resin containing hydrophilic silica as well aluminium oxide were much improved as compared to pure resin. Based on our investigations we have found that the methods of thermal analysis may be very useful for evaluation of nanocomposites: DSC/TGA study of resins in the liquid state under dynamic conditions can be applied to pre-select nanocomposites; isothermal TG curves of cured resins can be utilized for thermal stability evaluation; in turn, TG study after thermal ageing of cured resins could confirm the barrier properties of nanocomposites.

[发布机构] Electrotechnical Institute Division of Electrotechnology and Materials Science, M. Sklodowskiej-Curie 55/61, Wroclaw; 50-369, Poland^1;Faculty of Microsystems Electronics and Photonics, Wroclaw University of Technology, Janiszewskiego 11/17, Wroclaw; 50-372, Poland^2

[关键词] Barrier properties;Dielectric strengths;Dynamic condition;Hydrophilic and hydrophobic;Hydrophilic silica;Partial discharge resistance;Stability evaluation;Thermoanalytical method (TGDSC)