Dielectric and Viscoelastic Properties of Some Meta-Tetramethyl XyleneDiisocyanate-Based Polyurethanes as a Function of Sample Composition

摘要

A series of linear segmented polyurethanes were synthesized, based on softsegment of polycaprolactone having an average number molecular weight of 2100, hydroxyterminated polybutadiene having an approximate molecular weight of 2800. --Hard segments were made of meta-tetramethyl xylene diisocyanate and diethyl toluene diamine. The dynamic Young's modulus and loss tangent, relative permittivity, and dielectric loss, were found to be significantly affected by soft segment polarity and hard segment content. These results are discussed in terms of polymer morphology, such as degree of phase separation and soft segment phase state. Polyurethanes, Polycaprolactone, Polybutadiene, Meta-tetramethyl xylene diisocyanate, Loss tangent, Diethyl toluene diamine, Dynamic Young's modulus.