不同濃度之4-乙烯基吡啶對共聚物(聚4-乙烯基吡啶及苯乙烯)之影響

The effect of the different concentration of 4-vinylpyridine on the copolymer(poly(4-vinylpyridine-co-styrene))

李韋杰(Wei-Jieh Lee)

指導教授 ： 李三保

國立清華大學/工學院/材料科學工程學系/碩士(2009年)

摘要

我們使用不同的兩個單體(4-乙烯基吡啶和苯乙烯)來合成共聚物且變換它們的掺入量來觀察此兩單體的比例對整個共聚物在性質上的影響。因為4-乙烯基吡啶比苯乙烯較具極性，如此共聚物在電性、熱機械性質、光學性質、機械性質上都會因不同的兩單體比例而有所改變。我們自行合成了聚苯乙烯以及共聚物，並藉由紅外光譜儀、凝膠滲透層析儀、元素分析儀、核磁共振儀去分析共聚物中兩單體的比例、化學鍵結以及分子量。之後，我們做了幾種測試來了解兩單體比例不同的共聚物性質。在熱機械分析上，我們知道當4-乙烯基吡啶增加時，熱膨脹係數會減小。藉由硬度測試，我們了解4-乙烯基吡啶增加時硬度也隨之增加。而示差掃描熱卡計測試結果告訴我們玻璃轉換溫度將隨著4-乙烯基吡啶的增加而增加，甚至我們可以用Gordon-Taylor方程式來擬合我們的數據點，藉此得知每種共聚物比例的玻璃轉換溫度。在光學上，折射率會隨著4-乙烯基吡啶的減少而增加，而消光係數則在波長小於500奈米時會驟然增加，那意味著共聚物變的更有吸光性。在介電性質上，低頻區的介電常數會隨著4-乙烯基吡啶的增加而增加，但是在波長範圍400至800奈米時卻會隨著4-乙烯基吡啶的增加而減少。

關鍵字

4-乙烯基吡啶 ； 聚4-乙烯基吡啶及苯乙烯 ； 共聚物 ； 苯乙烯

並列摘要

We introduce different amount of 4-vinylpyridine (4VP) and styrene in the copolymer to observe how the properties vary with the ratio of two monomers. Since the monomer 4VP has more polarity than the styrene, thus the copolymer properties in electric, thermo-mechanical, optical, and mechanical properties of copolymers have changes with different ratios. We synthesize the copolymer and pure polystyrene, and characterize by various measurements containing FTIR, GPC, Elemental Analysis (EA), and NMR to identify the ratio of two monomers in the copolymer, the bonding, and the molecular weight of all the polymers. In the thermo- mechanical property, we can see that the thermal expansion coefficient decreases with increasing 4VP. By the hardness measurement, we know the hardness increases with increasing 4VP. The DSC measurement shows that the glass transition temperature in any ratio fitted by the Gordon-Taylor Equation. The refractive index increases with decreasing 4VP, and the extinction coefficient of copolymers increases abruptly with wavelength less than 500 nm that means copolymers get more absorbing. In the dielectric property, the dielectric constant in the range of low frequency increases with increasing 4VP, but decreases in the wavelength range of 400~800 (nm) with increasing 4VP.

並列關鍵字

4-vinylpyridine ； poly(4-vinylpyridine-co-styrene ； copolymer ； styrene

參考文獻

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