DIPOLE-MOMENTS OF ISOTACTIC AND ATACTIC POLY(PROPYLENE OXIDE) SAMPLES


KUCUKYAVUZ Z., ALYURUK K., AHMAD A.

POLYMER, cilt.32, ss.564-568, 1991 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 32 Konu: 3
  • Basım Tarihi: 1991
  • Doi Numarası: 10.1016/0032-3861(91)90464-t
  • Dergi Adı: POLYMER
  • Sayfa Sayıları: ss.564-568

Özet

Dipole moments of poly(propylene oxide) (PPO) samples with different tacticities were determined from dielectric constant and refractive index increment measurements, which were performed on dilute toluene and isooctane solutions. In contrast to previous reports, both refractive index increments and the dipole moment ratios showed a marked dependence on the tacticities of the samples. The dipole moment ratios of isotactic samples were greater than unity and decreased with increasing sequence concentrations of structural irregularities. The temperature coefficients in toluene were negative for both isotactic and atactic samples. No effect of excluded volume was observed.