Accession Number:

ADA183247

Title:

Crystallization Relationships Between Poly(bis(phenoxy)phosphazene)-(PBPP) Crystals.

Descriptive Note:

Technical rept.,

Corporate Author:

PITTSBURGH UNIV PA SCHOOL OF ENGINEERING

Personal Author(s):

• Kojima,M.
• Magill,J. H.

Report Date:

1987-07-15

Pagination or Media Count:

20.0

Abstract:

Whenever solution grown alpha-form 3-D crystals of PBPP were heated in the thermotropic region between T1 and Tm the isotropic temperature they convert to the 2D pseudohexagonal, delta-form crystals. Upon rapid quenching into liquid nitrogen the delta form frozen-in still remains upon warming to room temperature. Further heating close to T1 produces a 3-D hexagonal modification epsilon-form which is a morphological modification of the monoclinic alpha-form of PBPP confirmed already by electron diffraction measurements.

Descriptors:

• *CRYSTALLIZATION
• *PHOSPHAZENE
• CRYSTALLIZATION
• CRYSTALS
• ELECTRON DIFFRACTION
• HEATING
• ISOTROPISM
• LIQUID NITROGEN
• MEASUREMENT
• MODIFICATION
• MORPHOLOGY
• QUENCHING
• ROOM TEMPERATURE
• TEMPERATURE

Subject Categories:

• Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE