Dynamic Postpolymerization Modification Based on Knoevenagel Adducts of Meldrum’s Acid

Postpolymerization modification using “click” reactions has been proven to be a powerful method to build functional polymers, but the way to construct dynamic functional polymers remains challenging. In this work, C═C/C═N dynamic exchange reaction between Meldrum’s acid condensate and aldimine was employed to establish an efficient dynamic PPM method. Under the condition of catalyst free and room temperature, the conversion of PPM based on C═C/C═N dynamic exchange reaction can be up to more than 90%. Furthermore, reactive polymer coatings for in situ generating dyes with different absorbance wavelengths (λ max = 360–605 nm) and rewritable fluorescent papers were successfully developed by using dynamic PPM to tune the electron donor−π-acceptor structures in MA condensates on polymers.