高分子材料玻璃轉換溫度量測技術之開發

Developing the Experimental Techniques to Measure the Glass Transition Temperature of Polymers

張良健(Liang-Jian Chang)

指導教授 ： 徐炯勛

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2012年)

摘要

高分子材料應用之領域已日漸增加，且高分子材料於軟性顯示器領域之應用為目前科技發展之一大主軸。高分子材料機械性質易受溫度影響，因此，高分子材料熱轉移現象之重要性倍受重視。熱轉移現象中，玻璃轉換溫度為材料之第一級轉變溫度，因此，高分子材料之玻璃轉換溫度廣受各界重視。
本文研究以光學量測法之投影條紋技術與相位移陰影疊紋法量測高分子材料之像素灰階值及材料受熱之變形量，並首度利用灰階值及變形量與溫度之關係量測高分子材料之玻璃轉換溫度，且利用寬度3 mm與6 mm之投影條紋及光柵間距300 μm與400 μm之玻璃光柵探討於不同量測參數下玻璃轉換溫度量測結果之差異，再以材料受熱後變形之現象探討本文兩不同量測法所適用之材料。最後以動態黏彈性機械分析儀分析本文實驗所使用之高分子材料，將其分析之結果比對本文量測結果，進而驗證本文量測法之準確性與可行性。

關鍵字

高分子材料 ； 軟性顯示器 ； 玻璃轉換溫度 ； 投影條紋技術 ； 相位移陰影疊紋法

並列摘要

Polymer materials have been increasingly applied in a wide range of categories due to their attractive merits. One of important properties of polymer materials is that their exhibiting characteristics including dimensions, mechanical, optical and chemical properties may be significantly influenced by the temperature. This is why that more and more efforts have been made on their thermal transition phenomena. Among their thermal transition temperatures, glass transition temperature (Tg) is the first-order transition temperature and is also the most important one. Therefore, this study aims to develop the experimental techniques to measure the Tg of polymer materials.
In this study, a phase-shifting shadow moire (PSSM) was first employed to measure the relation between the deflections and temperature variations of polymer cantilever beams. The grating pitches of 300 μm and 400 μm were respectively adopted in experiments and Tg were determined from the experimental results. Then another approach was proposed based on gray level variations of pixels. A DLP projector was utilized to project the regular fringes on the surface of polymer cantilever beams. The fringe pitches with 3 mm and 6 mm were respectively projected. Two algorisms according on the gray level variations of pixels were presented to discuss their appropriateness to Tg. Finally, the measurement results obtained by the proposed methodologies were compared to those measured by a dynamic mechanical analyzed (DMA).

並列關鍵字

Polymer materials ； Glass transition temperature ； Shadow moire method ； dynamic viscoelastic mechanical analyzer

參考文獻

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