2021 Fiscal Year Final Research Report
Development of a novel evaluation method for the plasticization by using with proton spin relaxation time measurement
| Project/Area Number |
19K05533
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 34020:Analytical chemistry-related
|
|---|
| Research Institution | Osaka Institute of Technology |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
中村 吉伸 大阪工業大学, 工学部, 教授 (70298800)
藤森 啓一 大阪工業大学, 工学部, 准教授 (70319573)
|
|---|
| Project Period (FY) |
2019-04-01 – 2022-03-31
|
| Keywords | プロトン核磁気横緩和時間 / PVC / 可塑剤 / パルスシーケンス |
|---|
| Outline of Final Research Achievements |
The proton spin-spin relaxation times (T2) of ion-selective electrode membranes prepared from different solvents were investigated. The solvents applied to the preparation of the potentiometric polymeric membranes were tetrahydrofuran (THF), 1,4-dioxane, acetone, methyl ethyl ketone (MEK) and chloroform. T2 measurements were performed using the Hahn-Echo, Solid-Echo and Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences. Analyses of the T2 measurements by Hahn-Echo pulse sequences could provide the average T2 values of the whole potentiometric polymeric membranes. The average T2 values will indicate the degree of plasticization for the whole membranes. Moreover, the normalized derivative spectra by T2 measurements of the Solid-Echo and CPMG pulse sequences could visualize the degree of plasticization for such potentiometric polymeric membranes. The most plasticized ISE membrane by THF exhibited the best EMF response and ion-selectivity.
|
| Free Research Field |
分析化学
|
| Academic Significance and Societal Importance of the Research Achievements |
1H核磁気緩和現象の横緩和時間に着目した評価法は、非破壊検査法でありかつ経時変化も含めて容易に観測できることや、どのような形状の複合材料でもそのまま測定可能というこれからの新しい物性評価法に望まれる資質を有している上、分子運動性に対応する成分の測定が可能という他の評価法に例を見ない非常に特徴的な物性評価法としての開発が期待できる。
加えて、産業界において、軟質塩ビは、RoHS2.0指令以降可塑剤の滲みだし・揮発・移行に関する対応を迫られている。展開している分析手法は一般的な塩ビ材にも適用可能なため、塩ビ可塑剤に関する知見を与える評価法として、果たす役割は大きい。
|
