Crosslinking capping agents

Oligomeric agents were prepared by condensing trimethylolpropane with ethylene and/or propylene oxides and capping with acrylic acid. These materials were subsequently crosslinked using 2,2 -azobisamidinopropane dihydrochloride, which formed superabsorbent swellable hydrogel addition polymers and were useful as components in diapers or in feminine hygiene products. 

Fig. 20 a The polyrotaxane formed by a-CD and PEO with 2,4-dinitro-phenyl end caps, b The figure-of-eight cross-link covalently cross-linked cyclodextrins. c Schematic diagram of the polyrotaxane gel prepared from the sparse polyrotaxane by covalently cross-linking cyclodextrins using cyanuric chloride as crosslinking agent [89]... 

Fig. 22 Schematic illustration for the preparation of polyrotaxane hydrogels by chemically crosslinking a-CD molecules in the polyrotaxane with hydrolyzable end caps, using PEO-bisamine as the crosslinking agent [92]...

A triazole crosslinked polymer can be formed by the cycloaddition of an azide end-capped polymer with dipolarophile acetylenic curing agent [31]. 

Disclosing the binding motif of multiblock RAFT polymers on AuNPs from citrate reduction raises the questimi of whether the polymer binding can vary for different types of AuNPs. It is known that AuNPs from the two-phase Brust-Schiffrin synthesis can assemble into spherical particle networks when treated with low molecular weight crosslinking agent [106, 107]. When tetraocty-lammonium bromide-capped AuNPs from this two-phase method are functionalized in toluene dispersion with multiblock RAFT polymers of styrene, the formation of spherical AuNP assemblies can be observed by TEM (Fig. 9) [108]. It can be concluded from these TEM images that the particle density inside... 

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