High performance thermosetting resins made of durable polybenzoxazines, were produced in order to eliminate the brittleness for electronic applications. High molecular weight methylenedianiline (BA-mda)- and hexamethylenediamine (BA-hda)-based polybenzoxazines were prepared via the solvent method. The two different amine-based polybenzoxazines were investigated for dielectric behaviors in the microwave frequencies. Dielectric characteristics were observed in the frequency range of 300 MHz to 1 GHz, from -50 �C to 150 �C. The results showed that the relative permittivity (e') and loss tangent (Tan d) of poly(BA-mda) were 4.57 and 0.022, respectively, which was higher than that of poly(BA-hda) (e' = 3.04 and Tan d = 0.008) measured at room temperature (1 GHz). In addition, the dielectric properties of poly(BA-hda) were nearly stable with variations of temperature and frequency while poly(BA-mda) indicated temperature and frequency dependence. However, the dielectric characteristics of these resins showed slight fluctuations when compared with general polymers demonstrating low relaxation behaviors. Dielectric constant of methylenedianiline-based polybenzoxazine (BA-mda).

Dielectric performance of high molecular weight methylenedianiline (BA-mda)- and hexamethylenediamine (BA-hda)-based polybenzoxazines

246th National Meeting (2013)

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