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TGA 教學操作講習會

TGA 教學操作講習會. 石燕鳳. Thermogravimetric analysis (TG) is the study of weight changes of a specimen as a function of te-mperature. The technique is useful strictly for transformations involving the absorption or evolution of gases from a specimen consisting of a condensed phase.

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TGA 教學操作講習會

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  1. TGA教學操作講習會 石燕鳳

  2. Thermogravimetric analysis (TG) is the study of weight changes of a specimen as a function of te-mperature. The technique is useful strictly for transformations involving the absorption or evolution of gases from a specimen consisting of a condensed phase. Most TG devices are configured for vacuum and/or variable atmospheres. The balances associated with TG’s are highly sens-itive. These instruments may be used for a wide variety of investigations, from the decomposition of clays to high temperature oxygen uptake in the processi-ng of superconducting materials. THERMOGRAVIMETRICANALYSIS (TGA)

  3. 熱重量分析儀(Thermogravimetric Analyzer, TGA)是用於量測樣品材料在特定溫度條件下的重量變化情形的儀器。 其主要原理係將樣品置於一個可透過程控式升溫、降溫或恆溫的加熱爐中，通入固定的環境氣體下(例如：氮氣或氧氣)， 當溫度上升至樣品中某一材料成分的蒸發溫度、裂解溫度、氧化溫度時，樣品會因為蒸發、裂解、氧化而造成重量的損失， 記錄樣品隨溫度或時間的重量的變化，即可判定材料的裂解溫度、熱穩定性、成分比例、樣品純度、水份含量、還原溫度及材料的抗氧化性等特性。 • 熱重量分析儀(TGA)原理 • Principle of Thermogravimetric Analyzer

  4. 儀器設計

  5.  TG curves  DTA curves 

  6. 儀器擴充

  7. TGA應用實例 1.高敏感性揮發性物質含量分析 圖是保特瓶(用量僅需2.4 mg)之分析結果，顯示其中含有 0.2102%高敏感性揮發性物質。

  8. 2.藥物特性測定 可協助藥物學家了解藥物之熱力學參數，如圖是藥物lactose monohydrate之熱裂解分析圖 圖四Lactose monohydrate之熱裂解分析圖

  9. 3.分析無機成份含量 由殘留灰份可測定材料中無機成份之含量，圖是PE果汁包裝瓶之分析，顯示其中含有0.28% 無機成份。 圖五PE果汁包裝瓶之無機成份分析

  10. 4.阻燃性質分析 藉由熱重分析儀可了解材料的阻燃性，以及阻燃劑之阻燃效果。例如圖六分析結果顯示PE加入阻燃劑後，其熱裂解比例明顯降低。 圖六PE阻燃性質分析

  11. 5.熱穩定性分析 圖七是PVC、PMMA、HDPE、PTFE及PI等材料之熱穩定性分析，可看出PI之熱安定性最佳。 圖七材料之熱穩定性分析

  12. 6.組成分析 如圖八可分析出三種不同塗料中之組成成分之差異。 圖八 塗料中之組成成分之分析

  13. Flynn and Ozawa have shown that at a constant degree of conversion, α, the activation energy, E, of a reaction is related to the heating rate,β, and the temperature, T, by the following equation: The value of E can be obtained from the slope of the logβ versus 1/T plot.

  14. 謝謝 聆聽 敬請 指教

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