本研究製備纖維素奈米纖維與聚乙二胺樹枝狀高分子之複合薄膜並檢測其二氧化碳吸收之能力。首先以TEMPO法氧化纖維素而得到奈米纖維(TOCNF)，此反應優點為高轉化效率以及對纖維素結構之官能基化;如羧基的修飾。此奈米纖維(TOCNF)作成薄膜具有光學透明性；TOCNF可進一步與樹枝狀分子(Polyamidoamine (PAMAM) dendrimer ) 混參，增進其對CO2之選擇性。混參時，需被過程中所產生之靜電作用(electrostatic interaction)與控制希夫鹼(Schiff base)之含量，此複合材料可進一步乾燥後製成薄膜。為了探討複合材料混參之過程以及pH改變的影響，我們將螢光觸媒分子嵌入樹枝狀分子，藉由顏色的改變，探討不同pH值下CO2之吸附情況。而螢光分子中，酚酞對於CO2吸附敏感度優於fluorescein isothiocyanate (FITC)，經量測此薄膜對於CO2吸附量為0.9wt%。使用氣體滲透分析儀檢測filtered-film與dried-film(厚度:12 μm)在CO2與N2氣體下的差異。其結果顯示filtered-film滲透率太低以至於可以忽略的然而dried-film的滲透率過高，因此薄膜的密度可以藉由樹枝狀高分子來控制。

The film of cellulose nano-fiber/poly (amido amine) dendrimer (DEN) was prepared, and their applications on CO2 absorption are examined. The cellulose nano-fiber of 2~3 nm width was synthesized by 2,2,6,6-tetramethyl-1-piperdinyloxy, free radical (TEMPO)-oxidation process and named TOCNF. The amine-terminated DEN (generation 4) was attached to the TOCNF by amide linkage to form a gel. During this hybridization process, the electrostatic interaction and the Schiff bases formation were controlled by pH and reduction reaction in the reaction solution. The films of TOCNF/DEN were prepared from the gel by two methods; filtered method and drying method. To monitor the hybridization and the response to pH change, the DEN was labeled by pH indicators. The color change of the film under CO2 was checked by UV-vis spectroscopy. The fluorescein isothiocyanate (FITC) was not sensitive for CO2 absorption, and the phenolphthalein indicated its color change drastically. This suggests the application of this film as the CO2 sensor. The CO2 capacity of the film was calculated from the weight change of the film and was 0.9 wt%. The filtered-film and the dried-films (thickness: 12 μm) were subjected to CO2 and N2 permeability analysis. The results showed that the permeability of filtered-film was negligible, and that of the dried-film was too high. Further experiments should be done; however it suggested that the density of the hybrid film could be controlled by the DEN.

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