| Project/Area Number |
09450364
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
高分子構造・物性(含繊維)
|
|---|
| Research Institution | HIROSHIMA UNIVERSITY |
|---|
Principal Investigator |
HIKOSAKA Masamichi Faculty of Integrated Arts and Sciences, HIROSHIMA UNIVERSITY Professor, 総合科学部, 教授 (60087103)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TODA Akihiko Faculty of Integrated Arts and Sciences, Associated Professor, 総合科学部, 助教授 (70201655)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Project Status |
Completed (Fiscal Year 1998)
|
| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1998: ¥3,500,000 (Direct Cost: ¥3,500,000)
|
|---|
| Keywords | POLYMER / CRYSTALLIZATION / MOLECULAR WEIGHT / DIFFUSION / NUCLEATION / INTERFACE |
|---|
| Research Abstract |
Nucleation and growth mechanism of polymers with high purity was studied based on the new experimental findings on the molecular weight (M) dependence of nucleation and growth rates, 1 and V.respectively. Pure and well fractionated Polyethylene (PB) and isotactic polypropylene (iPP) were isothermally crystallized at atmospheric pressure or under high pressure (P=4kb). It is found on PE that V ocM^-^H, where His a constant, which was named "power law of lateral growth rate". Similar law was also found on iPP.It is also found on PE for the first time that I ocM^-^H which was named "power law of nucleation rate". These results suggest the universality of the "power law" in crystallization mechanism. A topological model was proposed to explain the results that the nucleation and growth of polymers is a process of disentanglement and chain sliding diffusion within the melt, nucleus, crystal and interface between the melt and crystals.
|
