Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation

The chemical cross-linking modifications of asymmetric 3,3',4, 4'-benzophenone tetracarboxylic dianhydride and diamino-phenylindane (BTDA-DAPI) polyimide membranes with para-phenylenediamine (pPD) have been investigated. The modification was performed by immersing BTDA-DAPI polyimide membr...

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التفاصيل البيبلوغرافية
المؤلف الرئيسي:	Aziz, Farhana
التنسيق:	أطروحة
اللغة:	English
منشور في:	2010
الموضوعات:	TP Chemical technology
الوصول للمادة أونلاين:	http://eprints.utm.my/id/eprint/12366/1/FarhanaAzizMFKKKSA2010.pdf
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spelling	my-utm-ep.123662017-09-18T04:24:44Z Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation 2010 Aziz, Farhana TP Chemical technology The chemical cross-linking modifications of asymmetric 3,3',4, 4'-benzophenone tetracarboxylic dianhydride and diamino-phenylindane (BTDA-DAPI) polyimide membranes with para-phenylenediamine (pPD) have been investigated. The modification was performed by immersing BTDA-DAPI polyimide membranes in a pPD/methanol solution at ambient temperature for certain periods of time. The effects of immersion time and cross-linker concentrations on degree of cross-linking, physicochemical properties and gas transport properties of the membranes have been studied. The cross-linked BTDA-DAPI polyimide membranes were characterized using gel test, fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA) and x-ray diffractometer (XRD). The FTIR spectra confirmed that the cross-linking process had taken place, with the imide groups turning into amide groups during the modification process. The degree of cross-linking was increased with the increase in the immersion time and the cross-linker concentrations. It is also showed that there are small amount of insoluble materials remaining from the gel test. The XRD results revealed that the d-space of the polymeric chains changed after the modification due to the methanol swelling and structure tightening effects induced by cross-linking. The TGA and DSC results indicated that the degradation and glass transition temperature were sufficient for gas separation applications. The gas transport properties of the pure and cross-linked BTDA-DAPI polyimide membranes were investigated using gas permeation tests. The results showed that the cross-linked BTDADAPI polyimide membranes decreased the oxygen (O2), nitrogen (N2), carbon dioxide (CO2) and methane (CH4) permeabilities compared to the unmodified membranes. Interestingly, 10% pPD-120 min samples showed an impressive enhancement of selectivity for O2/N2 compared to the unmodified membrane from 6.19 to 10.01 with reasonable permeability. However, less favorable CO2/CH4 and CO2/N2 selectivity have been observed after diamine cross-linking for all samples. Thus, it appears that the pPD is a good alternative cross-linker agent for BTDA-DAPI polyimide membrane mainly for the separation of O2/N2 with 10% pPD and 120 minutes as the optimum cross-linker concentrations and cross-linking time, respectively. 2010 Thesis http://eprints.utm.my/id/eprint/12366/ http://eprints.utm.my/id/eprint/12366/1/FarhanaAzizMFKKKSA2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering Faculty of Chemical and Natural Resources Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Aziz, Farhana Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation
description	The chemical cross-linking modifications of asymmetric 3,3',4, 4'-benzophenone tetracarboxylic dianhydride and diamino-phenylindane (BTDA-DAPI) polyimide membranes with para-phenylenediamine (pPD) have been investigated. The modification was performed by immersing BTDA-DAPI polyimide membranes in a pPD/methanol solution at ambient temperature for certain periods of time. The effects of immersion time and cross-linker concentrations on degree of cross-linking, physicochemical properties and gas transport properties of the membranes have been studied. The cross-linked BTDA-DAPI polyimide membranes were characterized using gel test, fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA) and x-ray diffractometer (XRD). The FTIR spectra confirmed that the cross-linking process had taken place, with the imide groups turning into amide groups during the modification process. The degree of cross-linking was increased with the increase in the immersion time and the cross-linker concentrations. It is also showed that there are small amount of insoluble materials remaining from the gel test. The XRD results revealed that the d-space of the polymeric chains changed after the modification due to the methanol swelling and structure tightening effects induced by cross-linking. The TGA and DSC results indicated that the degradation and glass transition temperature were sufficient for gas separation applications. The gas transport properties of the pure and cross-linked BTDA-DAPI polyimide membranes were investigated using gas permeation tests. The results showed that the cross-linked BTDADAPI polyimide membranes decreased the oxygen (O2), nitrogen (N2), carbon dioxide (CO2) and methane (CH4) permeabilities compared to the unmodified membranes. Interestingly, 10% pPD-120 min samples showed an impressive enhancement of selectivity for O2/N2 compared to the unmodified membrane from 6.19 to 10.01 with reasonable permeability. However, less favorable CO2/CH4 and CO2/N2 selectivity have been observed after diamine cross-linking for all samples. Thus, it appears that the pPD is a good alternative cross-linker agent for BTDA-DAPI polyimide membrane mainly for the separation of O2/N2 with 10% pPD and 120 minutes as the optimum cross-linker concentrations and cross-linking time, respectively.
format	Thesis
qualification_level	Master's degree
author	Aziz, Farhana
author_facet	Aziz, Farhana
author_sort	Aziz, Farhana
title	Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation
title_short	Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation
title_full	Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation
title_fullStr	Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation
title_full_unstemmed	Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation
title_sort	preparation and characterization of para-phenylenediamine cross-linked polyimide membranes for gas separation
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering
granting_department	Faculty of Chemical and Natural Resources Engineering
publishDate	2010
url	http://eprints.utm.my/id/eprint/12366/1/FarhanaAzizMFKKKSA2010.pdf
_version_	1747814929535074304

Preparation and characterization of Para-Phenylenediamine cross-linked polyimide membranes for gas separation

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