臺灣博碩士論文加值系統

本研究是以聚乙烯基酚(PVPh)、聚甲基丙烯酸苯甲酯(PBzMA)與聚甲基丙烯酸苯酯(PPhMA)分別和聚苯乙烯(PS)混合來製作單分子膜，而溫度與混合比例作為變數。藉由表面壓力(π)隨著每分子佔據面積(A)的變化(π-A等溫線)、鬆弛曲線及震盪曲線行為，來觀察氣液界面上的行為，並利用熱力學的方法來了解混合單分子膜的穩定性，進一步利用Vollhardt動力學方程式進行模擬，來探討混合單分子膜在鬆弛過程中的成核與成長機制，以及使用震盪曲線來估算高分子材料的黏彈性質。
由等溫線的實驗及過剩面積的分析發現，混合單分子膜中分子與分子間確實具有作用力造成相變化及正負偏差的產生，證明混合系統偏離理想狀態，系統中兩成份具有可混合性的。而鬆弛曲線實驗得知，溫度的上升會使單分子膜穩定性下降，溫度達40℃時，甚至會使PVPh與PS的單分子膜快速達崩潰狀態。利用Vollhardt方程式模擬出kx與x值，得知kx受到溫度影響較大。由單分子膜的震盪實驗得知，黏彈性模數會因高分子的結構與Tg的差異而有所影響，藉由實驗估算出PVPh的黏彈性為最佳，而以PPhMA之黏彈性最差。

This article mainly discusses Poly 4-vinylphenol(PVPh), Polybenzyl methacrylate(PBzMA) and Polyphenyl methacrylate(PPhMA), each separately mixed with Polystyrene (PS) to produce monolayer, and we set temperature and mixing ratio as variables. Then, we observe the behavior of the gas-liquid interface by measuring surface pressure-area per molecule(π-A) isotherm, relaxation curve and oscillation curve behavior. Besides, we analyze the stability of monolayer through the application of thermodynamics. Furthermore, we use the Vollhardt kinetics equation to simulate the nucleation and growth model during the relaxing process of monolayer. Also, we study oscillation curve to estimate the viscoelastic properties of polymer materials.
Via the analysis of surface pressure-area isotherms and excess area, we find out that intermolecular interaction indeed happens among mixed monolayers and it will cause either positive or negative deviation of excess area. What’s more, it proves that the mixing system deviates from the ideal status, and the two components can be combined together in the system. Through the experiment of relaxation curve, we find out that temperature will affect the stability of monolayer: the stability of monolayer will decrease when the temperature is increasing. When the temperature reaches 40℃, PVPh and PS monolayers will soon reach the state of collapse. We obtain the constant x and kx from the Vollhardt kinetics equation and find out that temperature has great influence on kx.
In addition, we can learn that viscoelastic modulus was affected due to the difference between the structure of polymer and the Tg from the experiment of monolayers oscillation. To sum up, we can get the conclusion that PVPh has the best viscoelastic ability while PPhMA is the worst from above experiment.

中文摘要 I
Abstract II
目錄 IV
表目錄 VII
圖目錄 IX
第一章 緒論 1
1-1前言 1
1-2研究目的及動機 4
第二章 文獻回顧 6
2-1 Langmuir 單分子膜的形成 6
2-2 Langmuir 單分子膜的等溫行為 7
2-3 Langmuir 單分子膜的的相變化 10
2-4熱力學理論分析 12
2-5 單分子膜的鬆弛行為 13
2-6鬆弛曲線模擬的探討 14
2-7單分子膜的震盪行為 16
第三章 實驗 18
3-1實驗藥品 18
3-2實驗器材 22
3-3實驗步驟 24
3-3-1 π-A等溫線測量 24
3-3-2鬆弛曲線測量 25
3-3-3震盪曲線測量 26
第四章 結果與討論 27
Part1：PS、PVPh、PBzMA及PPhMA純成份系統 27
4-1 表面壓-每分子佔據面積(π-A)等溫線 27
4-2 單分子膜之鬆弛曲線 33
4-3 鬆弛曲線之模擬 39
Part2：PVPh、PBzMA、PPhMA與PS混合系統 43
4-4 表面壓-每分子佔據面積(π-A)等溫線 43
4-4-1 PVPh與PS混合系統 43
4-4-2 PBzMA與PS混合系統 47
4-4-3 PPhMA與PS混合系統 51
4-5 混合單分子膜過剩面積之探討 56
4-6 混合單分子膜之鬆弛行為 63
4-7 鬆弛曲線之模擬 70
4-8 lnkx對1/T及濃度 74
4-9 lnx對1/T及濃度 78
4-10 模擬參數kx及x對A∞/A0效應 82
4-11 單分子膜震盪曲線行為 87
第五章 結論 98
第六章 參考文獻 101
附錄 105

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