Download Hypercrosslinked Polymeric Networks and Adsorbing Materials, by Vadim A. Davankov PDF

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

      

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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

Sample text

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 [37]. 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 [38].

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 [125] with kind permission of American Chemical Society).

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