Dynamic self-aggregation and disaggregation behavior of thermoresponsive hyperbranched polyethylenimine with peripheral NIPAM groups: an infrared spectroscopic study†
Abstract
Hyperbranched polyethylenimine (HPEI) has been modified with O groups in the heating-and-cooling cycle also suggests that HPEI–NIPAM has a much more restricted structure. Moreover, two-dimensional correlation
O⋯D–N hydrogen bonds are found to be always dominating in the phase transition in close relation to the chain aggregation of HPEI–NIPAM unimers and disaggregation of micelles respectively.