New PDF release: Hypercrosslinked Polymeric Networks and Adsorbing Materials,

By Vadim A. Davankov

ISBN-10: 0444537007

ISBN-13: 9780444537003

Hypercrosslinked community polymers current a brand new category of polymeric fabrics with very large program percentages, together with adsorption know-how, ion alternate, HPLC, analytical chemistry, nanotechnology (nanocomposites), scientific polymers

  • First e-book describing the speculation, perform of instruction and use of polymeric adsorbing fabrics with the emphasis on new hypercrosslinked polystyrene-type polymers
  • Written by way of the originators of the concept that of hypercrosslinked polymers
  • Complex phenomena are defined through beautiful to good judgment, analogies and recognized results, instead of advanced mathematical therapy and laptop modelling
  • Reviews many Russian, German or even Czech language publications
  • Contains quite a few experimental info within the type of Figures and Tables

      

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Additional resources for Hypercrosslinked Polymeric Networks and Adsorbing Materials, Volume 56: Synthesis, Properties, Structure, and Applications

Sample text

For these reasons, a complete removal of the polymeric stabilizer is hardly pos­ sible. The remaining stabilizer shell does not affect noticeably the permeability of the beads for small inorganic ions, but may cause significant obstacles for the diffusion of larger organic molecules. , have also been used. Fine powders (less than 1 mm in diameter) of the inorganic compounds form a structured layer, pre­ venting mechanically the particles from sticking to each other. After accomplishing copolymerization, these powders must be rigorously washed out, which, however, creates an additional problem of gener­ ating large volumes of waste waters.

If one of the paths brings back to the same junction, without including another junction, we deal with an intramolecular loop. In the case a path breaks with a chain end without including another junction, it represents a dangling chain. Dangling chains factually reduce the functionality of the junction from which they originate. The shortest cyclic path from a junction through the network back to the same junction should be considered a network mesh. Each network mesh can embrace several chains belonging to neighboring meshes.

Abnormally high concentration of free radicals was found to be character­ istic of this material [65]. As early as in 1956, Pravednikov and Medvedev [66] explained the accumulation of free radicals by the rapture of stressed chains that fail to tolerate osmotic pressure. However, no new portions of free radicals were observed to appear during additional swelling of the popcorn itself. According to another opinion, popcorn arises as a result of immobilization of a macroradical in a microgel or of chain raptures caused by “chain oriental growing” [67].

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Hypercrosslinked Polymeric Networks and Adsorbing Materials, Volume 56: Synthesis, Properties, Structure, and Applications by Vadim A. Davankov


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