Polarized infrared spectra of poled aromatic polyamide films

In connection with ferroelectric behavior of aromatic polyamides poled at a high electric field, polarized infrared spectra were studied in poled films of crystalline and amorphous aromatic polyamides consisting of ring systems to elucidate the relation between the orientation of polar groups and the ferroelectric polarization. The infrared spectra revealed that the CO and NH bonds oriented preferably along the poling direction in both crystalline and amorphous polyamides. The crystallinity of the crystalline polyamide increased with poling. In the amorphous polyamide, strong intermolecular hydrogen bonding is closely related to the retention of ferroelectric polarization in the frozen state of molecular motions below the glass transition temperature. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 531–538, 1999

[1]  N. Koizumi,et al.  Ferroelectric properties of polyamides consisting of hepta- and nonamethylenediamines , 1998 .

[2]  N. Koizumi,et al.  Ferroelectric Behavior in Polyamides of m-Xylylenediamine and Dicarboxylic Acids , 1995 .

[3]  M. Nonomura,et al.  Ferroelectric properties and polarization reversal phenomena in nylon 11 , 1995 .

[4]  N. Koizumi.  Ferroelectric behavior in polyamides constituted of ring systems , 1995 .

[5]  N. Koizumi,et al.  Dielectric Hysteresis Loop in Alicyclic and Aromatic Polyamides , 1994 .

[6]  J. Fedderly,et al.  FTIR and X‐ray study of polymorphs of nylon 11 and relation to ferroelectricity , 1994 .

[7]  N. Koizumi,et al.  Ferroelectric Properties in Polyamides of m-Xylylenediamine and Dicarboxylic Acids , 1993 .

[8]  J. Scheinbeim,et al.  Ferroelectric polarization mechanisms in nylon 11 , 1992 .

[9]  J. Scheinbeim,et al.  Effect of annealing on the ferroelectric behavior of nylon - 11 and nylon - 7 , 1991 .

[10]  J. Scheinbeim,et al.  Ferroelectric Polarization Switching in Nylon 11 , 1991 .

[11]  J. Umemura,et al.  Infrared spectroscopic evidence for the coexistence of two molecular configurations in crystalline fatty acids , 1975 .

[12]  G. Varsányi,et al.  Vibrational spectra of benzene derivatives , 1969 .

[13]  M. Yamashita,et al.  Crystal structure of poly(m‐xylylene adipamide) , 1966 .

[14]  I. Matsubara,et al.  Studies on structure and properties of aromatic polyamides. II. Structural elucidation of poly(m‐xylylene adipamide) , 1964 .

[15]  R. G. Snyder,et al.  Vibrational analysis of the n-paraffins—I: Assignments of infrared bands in the spectra of C3H8 through n-C19H40 , 1963 .