Point of incipient network
formation in a process forming a chemical or physical polymer network
- In both network-forming polymerization and the crosslinking of polymer chains, the gel
point is expressed as an extent of chemical reaction (c.f., gel time).
- At the gel point a solid (network) material spanning the entire system is formed.
- The gel point is often detected using rheological methods. Different methods
can give different gel points because viscosity is tending to infinity at the gel
point and a unique value cannot be measured directly.
PAC, 2007, 79, 1801
(Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007))
on page 1809
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook