By Vadim A. Davankov
Hypercrosslinked community polymers current a brand new type of polymeric fabrics with very huge program chances, together with adsorption expertise, ion alternate, HPLC, analytical chemistry, nanotechnology (nanocomposites), clinical polymers
- First publication describing the speculation, perform of practise and use of polymeric adsorbing fabrics with the emphasis on new hypercrosslinked polystyrene-type polymers
- Written through the originators of the idea that of hypercrosslinked polymers
- Complex phenomena are defined by way of attractive to good judgment, analogies and recognized results, instead of complicated mathematical remedy and machine modelling
- Reviews many Russian, German or even Czech language publications
- Contains a number of experimental info within the type of Figures and Tables
Read or Download Hypercrosslinked Polymeric Networks and Adsorbing Materials, Volume 56: Synthesis, Properties, Structure, and Applications PDF
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Extra resources for Hypercrosslinked Polymeric Networks and Adsorbing Materials, Volume 56: Synthesis, Properties, Structure, and Applications
Finally, 16 Known Types of Polystyrene Networks according to the theoretical expectations, the swelling ratio in toluene (>50) of the gel isolated just beyond the gel point was very high, implying no occurrence of microgelation up to the gel point conversion. 17% m-DVB as a perfect network containing no intramolecular loops is a rather fortuitous conclusion. 5–1% and, particu larly, diluting the monomer mixture by one-third with toluene result in a dramatic delay of gelation, compared to the theory.
The participation of a noticeable portion of the divinyl comonomer in the formation of intramolecular links was also reported by Dusˇ ek and Spevacek . To obtain a three-dimensional styrene copolymer, the authors used ethylene dimethacrylate as the crosslinking agent. It had been found in this case also that at low degrees of conversion, the intra molecular cyclization strongly dominates over intermolecular crosslinking. Yet, the crosslinking agent used here possesses a flexible structure that additionally facilitates the formation of intramolecular cycles .
7). Swelling of real networks, indeed, proves to be smaller if a higher quantity of DVB molecules per living chain end is introduced into a precursor polystyrene solution; however, more than five DVB molecules do not cause any further decrease in swelling (irrespective of the type of DVB isomers). According to the prediction of Eq. 6 Theoretical variation of swelling Q vs. functionality f; molecular weight of polystyrene-precursor is (1) 80,000; (2) 20,000, and (3) 10,000 Da. (Reprinted from  with kind permission of American Chemical Society).