network defect in polymer chemistry

https://dx.doi.org/10.1351/goldbook.NT07604
Elastically ineffective chains in a polymer network.
Note:
A network defect is caused by a loose end or a cyclic structure.
Source:
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 1820