Cross-link

In polymer chemistry, a cross-link is a chemical bond or small group of bonds that connects two bigger polymer molecules.[1] Making cross-links is calle

In polymer chemistry, a cross-link is a chemical bond or small group of bonds that connects two bigger polymer molecules.[1] Making cross-links is called cross-linking or curing, and is an important part of making many different materials.

A chemical that creates cross-links in a polymer is called a cross-linking agent. If sulfur is used as the cross-linking agent, the process is sometimes called vulcanization. Oxygen from the air can also be a cross-linking agent; chemicals that are cross-linked by oxygen are called drying oils.

The amount of cross-links in a sample can change properties like strength, density, and flexibility. The amount of cross-links is also linked to the swelling capacity, which is used to measure how cross-linked something is.[2]

Sources

  1. ↑ IUPAC, Compendium of Chemical Terminology, 5th ed. (the "Gold Book") (2025). Online version: (2006–) "crosslink". doi:10.1351/goldbook.C01409
  2. ↑ "Swelling estimates cross-link". Chemical & Engineering News Archive. 44 (47): 24. 1966. doi:10.1021/cen-v044n047.p024a.

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