| Project/Area Number |
04805091
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
高分子物性・高分子材料（含機械材料）
|
|---|
| Research Institution | Nagoya Institute of Technology |
|---|
Principal Investigator |
SHIMADA Shigetaka Nagoya Institute of Technology, Department of Engineering, Associate Professor, 工学部, 助教授 (20024309)
|
|---|
| Project Period (FY) |
1992 – 1993
|
| Project Status |
Completed (Fiscal Year 1993)
|
| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
|
|---|
| Keywords | Free Volume / Electron Spin Resonance / Spin Label / Molecular Miscibility / Polymer Blend / Polymer Surface / Molecular Motion / Mechanical Fracture |
|---|
| Research Abstract |
1. The electron spin resonance (ESR) line shape of nitroxide radical labeles attached to poly(ethylene oxide) (PE0) in a blend with isotactic poly(methyl methacrylate)(PMMA) was studied as a function of aging and annealing temperatures. The ESR line shapes of the nitroxide radical labeles attached to PMMA and the nitroxide probe in the blend were also studied. Two spectral components with different rates of motion -a "fast" component and a "slow" component are observed. The fractional amount of the fast component observed at room temperature changes with aging and annealing temperatures. The mobile fractions decrease around -20ﾟC with decreasing aging temperatures, whereas the fractions increase abruptly around 55ﾟC with increasing annealing temperatures.
The specific volume of the blend was measured at room temperature by the dilatometric method. C.a.0.5% of volume contraction and expansion during aging and annealing at the same temperatures mentioned above. These experimental facts are attributed to relaxational phenomena related with annihilation and formation of free volume in an amorhous region of the blend.
2. The chain end radical of polyethylene (PE) molecules anchored on a fresh polymer surface was produced by block copolymerization of ethylene which was initiated by mechano-radicals formed by mechanical fracture of a poly(tetra fluoroethylene) and located on the fresh surface. The molecular motion of the radical allows free rotation around the C-C bond axis even at 77K.The high mobility of the radical is attributed to weak intermolecular interaction, because of extremely low concentration of the PE chains on the surface, isolated from PTFE chains. In other words, the free volume of the PE phase on the PTFE surface is extremely large.
|
