Surface Properties of Hyper-Cross-Linked Polymeric Resins Using Inverse Gas Chromatography: Effect of Post-Cross-Linking Solvents

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• 作者：Lijuan Jia ; Xiaofei Song ; Jian Wu ; Chao Long
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：September 17, 2015
• 年：2015
• 卷：119
• 期：37
• 页码：21404-21412
• 全文大小：535K
• ISSN：1932-7455

文摘

Two series of hyper-cross-linked polymeric resins (hyper-resins) were prepared via post-cross-linking of low-cross-linked macroporous poly(vinylbenzyl chloride-divinylbenzene) (poly(CDVB)) or poly(styrene-divinylbenzene) (poly(DVB)) swollen in the solution of 1,2-dichloroethane or nitrobenzene, respectively. Inverse gas chromatography was used to investigate the effect of post-cross-linking solvents on the surface chemistry of hyper-resins. The dispersive component of the surface free energy (纬_s^d) and surface acid鈥揵ase character of hyper-resins were estimated using the retention time of different nonpolar and polar probes at the infinite dilution region. Results showed that the values of 纬_s^d were basically identical for the hyper-resins prepared using the same precursor; the acidity and basicity constants K_A and K_D confirmed that the surface of four hyper-resins were Lewis amphoteric with predominantly basic character, but the strength of the surface acidic and basic sites of hyper-resins synthesized using nitrobenzene as post-cross-linking solvent were slightly higher than that of hyper-resins synthesized using 1,2-dichloroethane as post-cross-linking solvent. In addition, characterization of the pore structure determined by N₂ gas adsorption at 77 K revealed that the effect of the post-cross-linking solvents on the porous structure of hyper-resins was minimal.