1989 Fiscal Year Final Research Report Summary
Fine Structures and Phase Transitions in Polyorganophosphazene
| Project/Area Number |
63044019
|
|---|
| Research Category |
Grant-in-Aid for Overseas Scientific Survey.
|
| Allocation Type | Single-year Grants |
|---|
| Section | Joint Research |
|---|
| Research Institution | YAMAGATA UNIVERSITY |
|---|
Principal Investigator |
MASUKO Toru Yamagata University, Professor, 工学部, 教授 (40007216)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YONETAKE Koichiro Yamagata University, Associate Professor, 工学部, 助教授 (30143085)
KOYAMA Kiyohito Yamagata University, Associate Professor, 工学部, 助教授 (60007218)
IWAKURA Kenji Yamagata University, Associate Professor, 工学部, 助教授 (50007019)
KOJIMA Morio University of Pittsburgh, Visiting Professor, 工学部, 客員教授
JOESEPH H. M ピッツバーグ大学, 工学部, 教授
MAGILL Joeseph H. University of Pittsburgh, Professor
|
|---|
| Project Period (FY) |
1988 – 1989
|
| Keywords | Poryorganophosphazene / Phase Transitions / Mesomorphic State / Single Crystal / Porymorphism / Lattice Constants / Crystallization Rate / Depolarization Light Intensity Method |
|---|
| Research Abstract |
We have investigated the following subjects at this International Scientific Research Program in two years.
(1) Structural studies on annealing effects of poly[bis(p-fluorophenoxy)phosphazene] and poly[bis(p-chlorophenoxy)phosphazene] associated with polymorphism. These annealing effects are only observed in the temperature range higher than T(1) transition. In this study, we have determined the lattice constants of poly[bis(p-fluorophenoxy)phosphazene]. (2) Kinetic studies on transformations from the 2D meso state to the 3D crystalline state in various kinds of polyorganophosphazene ( sample thickness dependence or nucleation effects ). (3) Preparation of single crystals of poly[bis(p-methylphenoxy)phosphazene] and poly[bis(p-methylphenoxy)phosphazene and determination of their lattice constants by electron diffraction techniques. (4) Examinations of phase transitions in polyphosphazeness by an ultra sonic absorption method. Sonic velocity changes and absorption intensity changes have clearly been detected at 170 C in the T(1) range.
Two subjects of these cooperative studies, (2) and (4), will be continued further in the next year. In this cooperation, wide varieties of mutual understandings between Japan and the United States have been experienced. We appreciate very much the Ministry of Education, who gave the chance to execute the International Research Program.
|
Research Products
(19 results)
