Triggered cross-linking light

Examples of triggered cross-linked hydrogels. (a)Temperature, pH, and light-triggered sol-gel transition, (b) Polymeric chains with grafted antibodies are cross-linked in the presence of specific antigens, (c) Polymeric chains with immobilized RGD are cross-linked in the presence of cells. 

Fancy, D.A. and Kodadek, T., Chemistry for the analysis of protein-protein interactions Rapid and efficient cross-linking triggered by long wavelength light, Proc. Natl. Acad. Sci. USA, 96, 6020-6024, 1999. 

In this chapter, we will focus on the design of polymers that exhibit photo-triggered self-healing properties. In addition to systems based on reversible network structures, the original strategies developed to heal un-cross-linked polymers with light will also be presented. 

Fig. 31 Radical polymerization on the MOF surfaces, (a) Molecular structure of the DVTP ligand, (b) Monomers used in the host-guest cross-polymerizations, (c) Cioss-iinkabie MOF [Cu(DVTpi(terephthalate)i (triethylenediamine)o.5] (l t shown in light blue) prepared in solid solution fashion, (d) Host accommodates vinyl monomers in its nanocavities, (e) Heat triggers radical cross-polymerization in the presence of AIBN initiator, yielding polymer nanocomposites, (f) Selective decomposition of the MOF matrix generates highly ordered cross-linked polymers. This figure is reproduced from [57] with permissirai...

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