聚乙二醇氣體分離膜之製備與其物性分析

Preparation, characterization and gas separation properties of polyethylene oxide membranes

黃冠誌(KUAN-CHIH HUANG)

指導教授 ： 賴偉淇

淡江大學/工學院/化學工程與材料工程學系碩士班/碩士(2021年)

https://doi.org/10.6846/TKU.2021.00624

摘要

本研究以聚乙二醇(PEO)高分子與不同比例之2,4-雙(3,4-二甲基苯基)山梨醇(1,3:2,4-bis(3,4-dimethylbenzyliden) sorbitol, DMDBS)混摻，以溶劑揮發法製備成薄膜，探討分子間作用力、薄膜的結構型態、熱性質、晶體結構、機械性質與氣體分離性能。
由FTIR分析可得知PEO與DMDBS會形成分子間氫鍵，隨著DMDBS的添加，分子間氫鍵有增強的趨勢。由結構型態可以發現在本研究中薄膜為緻密無孔洞的結構。由SEM與TEM可發現DMDBS會自組裝形成10~100奈米細纖維，纖維平均直徑與DMDBS添加量形成正比關係。由熱性質可以發現在PEO中加入DMDBS後，經由TGA測試發現能增加其起始裂解溫度，但對於最大裂解溫度不會有變化。由DSC測試結晶度與融點變化，發現添加DMDBS沒有影響PEO的結晶度與融點。由DMA機械性質分析發現添加越多DMDBS會使儲存模數與損失模數均有提升的趨勢。由XRD晶體結構分析中可以發現添加越多的DMDBS會使PEO的結晶性能變差的趨勢。由氣體分離測試發現隨DMDBS添加CO2滲透率會先上升後下降，N2滲透率則下降，因此CO2/N2的選擇率也有先上升後下降的趨勢。經由Robeson上限值計算可以知道在本研究材料均無超過Robeson上限。

關鍵字

聚乙二醇 ； 2,4-雙(3,4-二甲基苯基)山梨醇 ； 氣體分離

並列摘要

In this study the intermolecular forces, structure morphology, thermal properties, mechanical properties, crystal structure and gas separation performance, by using solvent evaporation method to prepared PEO blend 1,3:2,4-bis(3,4-dimethylbenzyliden) sorbitol (DMDBS) thin films.
By FTIR analysis, we found that PEO and DMDBS will form intermolecular hydrogen bonds. With the addition of DMDBS, the intermolecular hydrogen bonds tend to increase. By structure morphology, we found the thin film in this study is dense and nonporous, by SEM and TEM, it can be found that DMDBS will self-assemble to form 10-100 nanometer fine fibers, and the average fiber diameter is proportional to the amount of DMDBS added. By thermal properties, it can found that adding DMDBS will increase the initial pyrolysis temperature through TGA test, but the maximum pyrolysis temperature will not change. It is found that adding DMDBS did not affect the crystallinity and melting point of PEO, by DSC test for the crystallinity and melting point. By DMA mechanical properties, we found that the more DMDBS added, the storage modulus and loss modulus tend to increase. From the XRD crystal structure analysis, it can be found that the more DMDBS added will make the crystallization performance of PEO worse. By gas separation performance, we found that CO2 permeation will first increase and then decrease, N2 permeation will decrease, and the selectionof CO2/N2 also tends to increase first then decrease when the addition of DMDBS. By calculation the Robeson upper bound, it can be known that none of the materials in this study exceeds Robeson upper bound.

並列關鍵字

PEO ； DMDBS ； gas separation

參考文獻

[1] L. Shao, B. T. Low, T.-S. Chung, and A. R. Greenberg, "Polymeric membranes for the hydrogen economy: contemporary approaches and prospects for the future," Journal of Membrane Science, vol. 327, no. 1-2, pp. 18-31, 2009.

[2] S. L. Liu, L. Shao, M. L. Chua, C. H. Lau, H. Wang, and S. Quan, "Recent progress in the design of advanced PEO-containing membranes for CO2 removal," Progress in polymer science, vol. 38, no. 7, pp. 1089-1120, 2013.

[3] 顏芳儀, "聚偏二氟乙烯與分子篩混成富氧膜製備之研究," 淡江大學化學工程與材料工程學系碩士班學位論文, no. 2018 年, pp. 1-108, 2018.

[4] H. A. Mannan, H. Mukhtar, T. Murugesan, R. Nasir, D. F. Mohshim, and A. Mushtaq, "Recent applications of polymer blends in gas separation membranes," Chemical Engineering & Technology, vol. 36, no. 11, pp. 1838-1846, 2013.

[5] 葉志強, "碳化咖啡渣對 Polysulfone 中空纖維膜結構型態與性質影響之研究," 桃園創新技術學院, 2013.