Please use this identifier to cite or link to this item:
|Title:||Effects of thermal treatments and dendrimers chemical structures on the properties of highly surface cross-linked polyimide films||Authors:||Xiao, Y.
|Issue Date:||27-Apr-2005||Citation:||Xiao, Y., Shao, L., Chung, T.-S., Schiraldi, D.A. (2005-04-27). Effects of thermal treatments and dendrimers chemical structures on the properties of highly surface cross-linked polyimide films. Industrial and Engineering Chemistry Research 44 (9) : 3059-3067. ScholarBank@NUS Repository. https://doi.org/10.1021/ie048837g||Abstract:||We have conducted an extensive study to investigate the effects of thermal treatments and dendrimers' structures on the chemical and physical properties of the surface-modified polyimide films. The amidation and cross-linking reaction between G0 PAMAM dendrimers and polyimide were examined by XPS (X-ray photoelectron spectrometer) and FTIR-ATR (attenuated total reflection) measurements after thermal treatments under different temperatures. Moderate thermal treatment (120°C) is proven to be able to induce the highly amidation reaction and to increase the degree of cross-linking on the polyimide surface. The gas separation performance of modified polyimide films is significantly improved due to the enhanced "molecular sieving" ability by dendrimer modification and the stronger interactions between the polyimide chains, such as covalent cross-linking bonding and hydrogen bonding. When the temperature of treatment reaches 250°C, 1H NMR and GPC test implied that the cross-linking structure between polyimide chains is broken and that the degradation of polyimide backbone chains also occurs. Gas permeation tests also indicated that high-temperature treatment of dendrimer-modified polyimide films is not beneficial to separation. In addition, the performance comparison between different dendrimers, PAMAM- and DAB-modified films, is carried out. The chemical structural differences in PAMAM and DAB dendrimers have also been verified as one of the important factors in determining the properties of modified polyimide films. At room temperature, PAMAM dendrimers show stronger cross-linking ability. © 2005 American Chemical Society.||Source Title:||Industrial and Engineering Chemistry Research||URI:||http://scholarbank.nus.edu.sg/handle/10635/88817||ISSN:||08885885||DOI:||10.1021/ie048837g|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Oct 27, 2020
WEB OF SCIENCETM
checked on Oct 19, 2020
checked on Oct 11, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.