Hypercrosslinked Polymeric Networks and Adsorbing Materials, - download pdf or read online

By Vadim A. Davankov

ISBN-10: 0444537007

ISBN-13: 9780444537003

Hypercrosslinked community polymers current a brand new type of polymeric fabrics with very broad software chances, together with adsorption know-how, ion alternate, HPLC, analytical chemistry, nanotechnology (nanocomposites), clinical polymers

  • First booklet 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 idea that of hypercrosslinked polymers
  • Complex phenomena are defined by means of beautiful to logic, analogies and famous results, instead of advanced mathematical remedy and desktop modelling
  • Reviews many Russian, German or even Czech language publications
  • Contains various experimental information within the kind of Figures and Tables

      

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

Example text

Also, it was not possible to eliminate this serious defect by an anionic copolymerization of the comonomers. The anionic copo­ lymerization has often been initiated by n- or sec-butyl lithium [110–112]. 32. Therefore, DVB-enriched domains will form toward the end of the anionic process. 20) points to the local incorporation of m-DVB crosslinks into the initially formed copolymer [113, 114]. In addition, the anionic process is also accompanied by intramolecular cyclization, similar to radical styrene–DVB copolymerization [115, 116].

4 Scanning electron micrograph of a popcorn polymer. rearrangement of chains in the glassy copolymer. In addition, this observa­ tion contradicts to the above-mentioned reasons for the formation of this unusual material. Interestingly, although formed in bulk and in the absence of porogens, popcorns obviously represent porous materials. Scanning electron microscopy indicates that their texture is much like that of macroporous copolymers (see Fig. 4). However, its specific inner surface area is negligibly small.

Therefore, before considering their synthesis, structure, and properties, it is necessary to define an ideal polymeric network. The perfect, ideal network has to meet the following requirements: • it must have a homogeneous single-phase gel-type structure; • the distribution of crosslinks must be uniform through the entire network volume; • all chains forming the network must be elastically active, which implies the absence of network defects, such as dangling chains or chains connected to a junction point by two ends (intramolecular loops); • elastically active chains must obey Gaussian statistics, and hence they must possess a rather high-molecular-weight and, desirably, narrow molecular weight distribution; • the functionality of the junction points must be known and constant throughout the sample volume; and • permanent chain entanglements must be absent.

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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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