Poly host network

Simultaneous and sequential IPNs based on various polymeric systems have been prepared using polydimethylsiloxane (PDMS) as the host network (3-8). These systems include poly(ether-urethane), polystyrene, poly(2,6-dimethyl-1,4-phenyleneoxide), polyacrylic acid, PDMS, polymethylmethacrylate, polyethylene oxide (PEO)... as the guest network. Some semi-interpenetrating networks (s-IPNs) based either on a linear polymer embedded in a polysiloxane network (5,9,10) or on a linear polysiloxane combined with a PEO network (8) have also been described. In some cases, PDMS has been replaced by polyaromatic siloxanes such as polydiphenyl or polymethylphenylsiloxanes (10-12). The focus of this paper concerns the preparation and properties of IPNs and s-IPNs based on polysiloxanes and poly(diethyleneglycol bis-allylcarbonate) (13,14). 

Li L, Guo X, Wang J, Liu P, Prud homme RK, May BL, Lincoln SF (2008) Polymer networks assembled by host-guest inclusion between adamantyl and p-cyclodextrin substituents on poly(acrylic acid) in aqueous solution. Macromolecules 41 8677-8681. doi 10.1021/ ma8020147... 

The insertion of PEO into mica-like sheet silicates in the reactions of a melt of the polymer with the host Na - or NH4 -exchanged lattice is one of tiie few examples of direct polymer intercalation. Poly(ethylene oxide) is also inserted into the lamellar networks of V205-nH20, MoOs," " - MnPSj, CdPSj, " etc. Thus an aqueous solution of PEO (M = 10 ) reacts with an aqueous gel of V2O5 nH20 to form a composite after removal of water. In this case, the interlayer distance increases from 1.155 to 1.32nm. Alkali metal ions react with PEO to form inclusion compounds. These can also be inserted into layers of ionic silicates, for example, into MMN. The distance between the layers of the PEO-Li salt complexes intercalated into MMN is 0.8 nm, the PEO chain adopts a slightly strained helicoid conformation in these locations. 

Poly(ethylene terephthalate) is used to produce fibers or is processed as a thermoplastic material by injectionmolding or blow-molding. Sorption of pyrrole in films of this polymer followed by immersion of the film in an aqueous FeCls solution produced blends of polypyrrole and poly(ethylene tere late). The 30 /zm thick film obtained presented high optical transmittance at 633 nm and a conductivity in the range of 0.03-0.1 S cm [65]. Authors suggest that polypyrrole is distributed uniformly in the free volume of the poly(ethylene tereftalate) host, forming a conducting network at low concentrations (5%). 

On the basis of the protein dimensions (height = 14.5 nm, width=8.5 nm, thickness =40 nm) and the mesh size distribution, the antibody was indeed assumed to be hosted outside the polymer network on the surface of gel channels pervading poly-2-MOEG-9-BF1 matrix, as supported by the analysis of SEM images (Fig. 58). 

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