Cross-links are
covalent bonds linking one
polymer chain to another. They are the characteristic property of thermosetting polymer materials. In biology, cross-linking has applications in forming
polyacrylamide gels for
gel electrophoresis and in
protein studies. Crosslinking inhibits close packing of the polymer chains, preventing the formation of crystalline regions. The restricted molecular mobility of a crosslinked structure limits the extension of the polymer material under loading.
See more at Wikipedia.org...