Pulsed nmr study of radiation polymerization and crosslinking of n-isopropylacrylamide

摘要: Abstract The T 2 spin-spin relaxation time curves were used to monitor the network formation during radiation-induced polymerization of N-isopropylacrylamide (NIPAAm) in solution. Before irradiation, a single long exponential decay curve is observed (T 2L , about 1 sec). After irradiation with doses range 0.03 – 0.1 kGy, decreases 100 msec, and there appears shorter component, 2S order tens milliseconds, indicating presence network. From solubility measurements gel dose was 71 Gy. At above kGy always consist two components, longer millisecons, milliseconds. temperature dependence for samples irradiated different good agreement swelling data.