1995 Fiscal Year Final Research Report Summary
The Solution and Interface Properties of Photosurfactants and their Application to Polymer Gel Volume Control
| Project/Area Number |
06640749
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
機能・物性・材料
|
|---|
| Research Institution | SAGA UNIVERSITY |
|---|
Principal Investigator |
SHIRAHAMA Keishiro Department of Chemistry, Saga University, 理工学部, 教授 (50039252)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HAYASHITA Takashi Department of Chemistry, Saga University, Assistant Professor, 理工学部, 助教授 (70183564)
|
|---|
| Project Period (FY) |
1994 – 1995
|
| Keywords | Photosurfactant / Trans / cis isomerization / Micelle / Cyclodextrin / Surfactant-selective electrode / Induced circular dichroism / Polyanion / Cooperative interaction |
|---|
| Research Abstract |
1.4-alkylazobenzene 4'-oxyethyltrimethylammonium bromides form micelles in aqueous solution, which undergoes trans/cis isomerization on visible/UVlight irradiation, thus given a name : photosurfactant. The critical micelle concentration of trans/cis mixture decreases as the cis content increases, which is explained in terms of the bend molecular structure and increased dipole moment of the cis-form.
2.Interaction of photosurfactant with cyclodextrins is studied by means of potentiometric and circular dichroism spectroscopic methods. It is found that the surfactant-selective electrode senses the trans-form stronger than the cis-form by about 100 times. Chiral molecular field of cyclodextrins is found to induced circular dichroism to the photsurfactants which is directly proportional to the amount of included surfactant molecules. alpha-Cyclodextrins forms a 1 : 1 complex with the trans-form, but cis-form is rejected because of its bent molecular structure. beta-Cyclodextrin forms 1 : 1 complexes with both trans-and cis-forms, with a little less affinity than alpha-cyclodextrin. gamma-Cyclodextrin takes such complex ration as 2 : 1,2 : 2 in addition to 1 : 1 (surfactant : cylcodextrin).
3.Binding of photosurfactant with sodium poly (acrylamido 2-methyl-propane sulfonate) is measured the potentiometric method. The interaction is highly cooperative, and the binding from the trans/cis mixtures introduces a difficult problem of binding from a mixed surfactant solution, which is left for further investigation.
|
