Abstract
Polymer Science Measuring the elastic behavior of polymers is complicated by their long chain architecture, which can lead to transient entanglements and time-dependent behavior. A further complication arises in the case of covalently linked polymers, such as hydrogels, that contain fixed loop defects. By controlling defect structure during polymer synthesis, Zhong et al. can count the defects in a polymer gel and correlate them to elastic and rheological behavior. Current models are not able to capture their observations, but a real elastic network theory, based on a modified phantom network theory, can account for the impact of topological molecular defects. Science , this issue p. [1264][1] [1]: /lookup/doi/10.1126/science.aag0184
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