Abstract
The effect of arrangement of amide groups on the dielectric behaviors and the methylene infrared vibration for Long chain polyamide (LCPA) were investigated by comparative study on PA11 and PA1012, which are endowed with similar chain structures. Combining with variable temperature Fourier transformation infrared spectroscopy (FTIR) method, the impact of hydrogen bond on the dielectric behaviors was studied. The interrelationship between amide group density and dielectric property was established by extending the research ranges towards PA12 and PA1212. It was found that AB type LCPAs have stronger molecular polarity and amide group density is positive correlation with the polarity, while the hydrogen bonding will weak the dipole polarity. Meanwhile, the IR characteristic fingerprint region about the methylene infrared vibration monitored by amide group arrangement and the corresponding assignments of each absorption peak were concluded. The two methods also can be employed for quickly and accurately identify the AB and AABB types of polyamides.
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