Dangling chains are considered as a key defect in polymer networks, which connect to the network from one side and therefore, do not contribute to the network elastically. As shown in Figure , the number of dangling chains initially rises, peaks, and then disappears completely. Interestingly, the peak occurs at nearly the same conversion for all systems. However, peak heights-showing the maximum number of dangling chainsvary with prepolymer chain length and functionality. The peaks account for 20%, 30%, and 44% of dangling chains for the S-6OH, M-6OH, and L-6OH systems, respectively, which means longer prepolymer chains result in more dangling chains during crosslinking. The peak also sharpens with increasing chain length, which indicates a faster reduction in dangling chains after the peak. For M-4OH and M-3OH systems, the peak width is similar, though its height slightly increases with higher functionality.