We prepared the chemically crosslinked, cylindrical thermoresponsive poly(N-isopropylacrylamide) gels with changing the contents of reversible addition-fragmentation chain transfer (RAFT) agent. The environment in the gel was estimated by using a hydrophobic fluorescence probe. While the equilibrium swelling ratios were comparable, the deswelling response became fast as the content of RAFT agent increased with the formation of “bubble pattern”. This result indicates that the PNIPAAm gels prepared by RAFT still have spatial defects. In addition, the cooperative diffusion coefficients in swelling process of the gels prepared by RAFT polymerization were estimated.

中文翻译：

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RAFT 聚合形成的热敏凝胶的结构和性能：RAFT 试剂含量的影响

我们通过改变可逆加成-断裂链转移 (RAFT) 试剂的含量制备了化学交联的圆柱形热敏聚 (N-异丙基丙烯酰胺) 凝胶。通过使用疏水性荧光探针估计凝胶中的环境。虽然平衡溶胀率相当，但随着 RAFT 剂含量的增加，随着“气泡图案”的形成，消溶胀反应变快。该结果表明RAFT制备的PNIPAAm凝胶仍然存在空间缺陷。此外，估计了 RAFT 聚合制备的凝胶在溶胀过程中的协同扩散系数。