| 研究生: |
黃厚儒 Huang, Hou-Ju |
|---|---|
| 論文名稱: |
以二維NOESY核磁共振光譜探討聚(丙烯醯胺-共聚-N-乙烯甲醯胺)/十二烷基硫酸鈉鹽複合物之微結構 Microstructure of Poly(Acrylamide-co-N-Vinylformamide)/SDS complexes Studied by Two-Dimensional NOESY NMR |
| 指導教授: |
侯聖澍
Hou, Sheng-Shu |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 105 |
| 中文關鍵詞: | 高分子-界面活性劑 、NOESY 、核磁共振光譜 、團聯式共聚物 、PAAm-co-PNVF |
| 外文關鍵詞: | block copolymer, Polymer-surfactant, NOESY, NMR, PAAm-co-PNVF |
| 相關次數: | 點閱:62 下載:1 |
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由文獻得知聚丙烯醯胺 (PAAm) 與陰離子型界面活性劑十二烷基硫酸鈉 (SDS) 不具有相互作用力,而其同分異構物聚乙烯甲醯胺 (PNVF) 與SDS卻具有相互作用力存在。在本研究中為了探討此極端現象,而合成出一系列不同AAm/NVF組成比例之PAAm-co-PNVF無規共聚物與PAAm-b-PNVF團聯式共聚物,並更進ㄧ步的研究高分子共聚物與SDS之間的相互作用力。
本研究中的第一部分主要利用螢光光譜與2D NOESY探討PAAm-co-PNVF/SDS系統。由文獻得知SDS分子會靠近PNVF (5 Å),而在PAAm-co-PNVF/SDS系統中是否可藉由SDS分子與NVF之間的相互作用力而拉近SDS與AAm之間的距離?而高分子-界面活性劑之聚集微結構亦是本研究討論的重點。第二部分主要使用螢光光譜實驗來比較PAAm-b-PNVF/SDS團聯式共聚物系統與PAAm/PNVF/SDS混合系統對SDS的相互作用力;最後由黏度實驗觀察到團聯式與混合系統之高分子線團在不同SDS濃度範圍下會呈現出三種不同型態。
The main purpose of the study is to explore the extremely different behaviors toward SDS shown by poly(acrylamide) (PAAm) and poly(N-vinylformamide) (PNVF), in the present study we have synthesized statistical PAAm-co-PNVF copolymers and PAAm-b-PNVF block copolymers with different AAm/NVF ratios.
The part I of this study, we have initiated an investigation of the PAAm-co-PNVF/SDS system by pyrene fluorescence and 2D NOESY NMR. PAAm-co-PNVF is a good model copolymer suitable for the NOESY experiment, because the proton chemical shits of AAm, NVF, and SDS are well separated. We know that the SDS molecules can closely contact (<5Å) with PNVF, so the question arisen here is: could the SDS molecules be close (<5Å) to the AAm unit in the PAAm-co-PNVF copolymer with the aid of the strong interaction between NVF and SDS? Our answer based on the results from 2D NOESY NMR is “No!”. It suggests that the AAm unit (CH2CHCONH2) really dislike SDS, even the SDS molecules close by locate only several nanometers apart.
In the part II of the study, we focus on the PAAm-b-PNVF/SDS system by pyrene fluorescence and compared with PAAm/PNVF/SDS blending system. The polymer-surfactant interaction in the PAAm-b-PNVF/SDS system was weaker than PAAm/PNVF/SDS blending system. Viscosity measurements confirmed the presence of three behaviors: no change of the polymer coil shape in region I, contraction of polymer coils in region II, and expansion in the region III.
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