7. Grafting and cross-linking
Polymer grafting involves attaching poly-B macromolecular blocks to a poly-A macromolecular backbone. The result is poly(A-g-B) graft copolymers.
Crosslinking corresponds to the establishment of covalent bonds between linear chains, leading to the formation of a three-dimensional network. When the link is provided by a macromolecular segment, the operation can be likened to bifunctional grafting.
Grafting and crosslinking of preformed linear macromolecules therefore involve similar techniques: chemical, photochemical and radiochemical.
However, cross-linked polymer structures are frequently obtained by chain polymerization of monomers or oligomers carrying several polymerizable functions.
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Grafting and cross-linking
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