Photografting is a technique used in the study of polymers and more in specific polymeric biomaterials.
Technically speaking it is the covalent incorporation of functional additives to a polymer matrix or polymer surface using a light-induced mechanism.
It is an important technique for the modification of biomaterial surfaces.
For example, by graft with polar monomers, the inert polymer surface can become more biocompatible.
[1] This article about polymer science is a stub.