臺灣博碩士論文加值系統

本論文主要係研究玻璃態高分子鏈之奈米塑性流與奈米碳管交互作用行為。第一部份的研究中，主要研究奈米複合材料內玻璃態高分子鏈之奈米塑性流與多壁奈米碳管之交互作用行為。利用表面接枝聚苯乙烯之多壁奈米碳管分別分散於脆性(聚苯乙烯，Polystyrene)及韌性（聚氧化二甲苯，polyphenylene oxide）高分子系統內。雖然在兩系統中都因多壁奈米碳管的引入而有明顯增韌的現象，但多壁奈米碳管與高分子鏈的交互作用行為在脆性高分子的纖化區(craze-forming)及韌性高分子的剪變形區（SDZ-forming）卻有著截然不同的現象，與其存在於不同的高分子網狀結構有關。藉由原子力顯微鏡對局部應力的分析，高分子鏈糾纏網路的”伸展性”改變不僅只決定於纖化區或剪變形區，而且也決定於拉伸的高分子鏈與奈米碳管間的交互作用行為。此結果對於我們瞭解糾纏之高分子鏈的基本運動行為帶來一些重要的訊息。
第二部份的研究中，我們藉由高分子鏈與表面接枝聚苯乙烯之單壁奈米碳管間的交互作用行為影響闡明了高分子鏈在奈米尺度下的形變行為。基於原子力顯微鏡及電子顯微鏡觀察及微觀機械性質的計算下，“應力軟化”之玻璃態高分子鏈的運動與高分子鏈的交纏密度有很大的關連，並與高分子鏈交纏密度無關的彈性增韌形成強烈的對比。特別是在鬆散的聚苯乙烯高分子糾纏網路中單壁奈米碳管表現如同”幽靈碳管”一般，高分子鏈在形成奈米塑性流的過程中其“應力硬化”不會受到單壁奈米碳管的引入而產生改變。唯一可能的機制是這些“玻璃態”高分子鏈在奈米塑性流動的過程中藉由分子鏈的滑移產生糾纏點的聚集，此現象為一種新穎而且特別的非均相的分子鏈運動行為模型。此研究結果帶來有關玻璃態高分子及單壁奈米碳管/高分子複合材料基礎的行為。
第三部份的研究中，主要研究奈米碳管與硬桿式高分子聚苯噁唑(Polybenzoxazole; PBO)奈米複合材料薄膜在奈米尺度下之機械行為。儘管玻璃轉化溫度(Tg)高於600˚C，性硬桿式高分子聚苯噁唑在室溫下進行拉伸仍可產生高達~300%的塑性形變並形成局部纖化區。而此局部纖化區是藉由拉伸非結晶區之高分子而形成，藉由原子力顯微鏡的表面形貌分析計算此拉伸應力約為3GPa。然而此拉伸應力無法將結晶區域之高分子鏈分開。而奈米塑性流隨即因著微纖絲的斷裂而終止，顯示具有較低的拉伸比（＜2%)。當加入具表面改質過後的奈米碳管，大規模的高分子鏈與奈米碳管的結合經由改變聚苯噁唑而發生。在奈米塑性流動中的硬桿高分子鏈的拉伸率隨著加入相對較柔軟的單壁奈米碳管的含量增加而增加。然而在多壁奈米碳管系統中卻沒有影響。藉由單壁奈米碳管增加複合材料的機械性質是起因於單壁奈米碳管與高分子鏈結合所貢獻出的交聯影響參與了整個奈米塑性流動的過程所致。反觀多壁奈米碳管，因相對太過堅硬以致於無法參與奈米塑性流動的過程而無法達到增韌的效果。

Section:
Chapter1: Nanoplastic Flows of Glassy Polymer Chains Interacting with Multiwalled Carbon Nanotube in Nanocomposites……………………………………1
Chapter 2: Nanoplastic Interactions of Surface-Grafted Single-Walled Carbon Nanotubes with Glassy Polymer Chains in Nanocomposites ……….....26
Chapter 3: Molecular Reinforcement of Rigid-Rod Polybenzoxazole by Interactions with Surface-Grafted Carbon Nanotubes in Nano-Plastic Flows……….43
Appendix Relative Work: Hydrogen Bonding Effect on the Fluorescence of Poly[3-(2-hydroxyethyl) thiophene] Thin Film..………………………...62

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