Orientational Phenomena in Poly[Bis-(2,2,3,3,3-Pentafluoropropoxy)-Phosphazene] Mesophase
Titel:
Orientational Phenomena in Poly[Bis-(2,2,3,3,3-Pentafluoropropoxy)-Phosphazene] Mesophase
Auteur:
Zadorin, A. N. Borisenkova, E. K. Kulichikhin, V. G. Litvinov, I. A. Antipov, E. M. Tur, D. R.
Verschenen in:
International journal of polymeric materials
Paginering:
Jaargang 22 (1993) nr. 1-4 pagina's 127-133
Jaar:
1993-11-01
Inhoud:
The thermotropic behavior and morphology of poly[bis-(2,2,3,3,3-pentafluoropropoxy)phosphazene] (PPPh) have been investigated by various methods such as: differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. It was shown that a poiymer is able to exist in a four phases. A wide-angle X-ray temperature analysis indicates a monoclinic crystalline form for the first flow temperature) phase, the orthorhombic crystalline modification for the second one and the two-dimensional pseudohexagonal mesophase lattice for the mesomorphic state followed by the isotropic melt. Transition from the crystalline into the mesophase state in the range 85-100°C is observed. PPPh macromolecules in the mesomorphic state are found to be oriented in the extrusion direction.