Methods for Increasing Surface Area of Polymers
Advancing the chemical engineering fundamentals
Polymer Science & Engineering - II (T2-12b)
Keywords: Post-crosslinking, Surface area, Morphology
Post-polymerization crosslinking is a tool for controlling morphology of functional styrene-co-divinylbenzene polymers making possible to enhance their porosity and/or surface area beyond limits of the conventional polymerization in presence of porogenic solvents. Well known examples are hypercrosslinked resins based on chloromethylation route developed by Tsyurupa and Davankov [1]. Another possibility offers Friedel-Craft reaction of residual double bonds remaining in the polymer due to incomplete consumption of the crosslinker [2, 3]. Disadventage of these methods are possible problems due to dangerous chloromethylation or contamination of the products by remnants of the catalyst. In this contribution will be reported results of investigation of a cleaner route consisting of heating of swollen polymer in presence of peroxidic radical initiator. There will be discussed mechanisms of this procedure (polymerization of the residual double bonds and/or polyrecombination processes [4]) on the morphology of various macroreticular polymers investigated by nitrogen adsorption, inverse steric exclusion chromatography and 13C CP MAS NMR spectroscopy.
[1]. Davankov V. A., Tsyurupa M. P., React. Func. Polym. 53 (2002) 193-203
[2]. Ando K., Ito T., Teshima H., Kusano H. In: Streat M., editor. Ion exchange for industry. Chichester: Ellis Horwood Ltd .; 1988. p.232.
[3]. Aleksieva K., Jing Xu, Li min Wang, Sassi A., Pientka Z., Z. Zhang, Jerabek K., Polymer 47 (2006) 6544-6550.
[4]. Korshak V. V., Sosin S. L., Chistyakova M. V., Polym. Sci. U.S.S.R 1(3) (1960) 341-350.
Presented Tuesday 18, 09:05 to 09:25, in session Polymer Science & Engineering - II (T2-12b).
