Abstract
Polarization reversal and internal electric field were studied for the aromatic polyamides of m-xylylenediamine (MXD) with linear aliphatic dicarboxylic acids in which the number of methylene groups is in the range of 4−10. Polarization reversal was measured for all MXD polyamides at room temperature and at a temperature just above the glass transition temperature (Tg). Large polarization was measured for the polyamides with odd numbers of methylene groups in a dicarboxylic acid unit poled at temperatures above Tg. Internal electric field was measured from the electrochromic spectrum shift and broadening of the probe molecule of 4-(dimethylamino)-4‘-nitrostilbene in the polyamides with even numbers of methylene groups in a dicarboxylic acid unit. Large internal electric field was measured for the samples in which the remanent polarization measured from the polarization reversal is small. The large internal electric field is mainly ascribed to the space charges created by the injected charges. Upon thermal...
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