Fig. 3: Dynamic property of DHPMT-acrylate polymers.
From: Heterocycle-based dynamic covalent chemistry for dynamic functional materials
a Linear polymer P1 prepared by A2 and B2 monomers and its degradation (top) and comparative 1H NMR (400 MHz, DMSO-d6) analyses of A2 monomer, B2 monomer, P1, and the mixture after 4 h of degradation, respectively (bottom). Conditions: 120 °C, 1.0 mM P1 (calculated as monomer units) with 1 eq sodium tert-butoxide (tBuONa) in DMSO-d6 (for NMR analysis) or DMF (for gel permeation chromatography (GPC) analysis). b, Preparation of the crosslinked bulk material (Ph polymer) from phenyl-substituted di-DHPMT monomer (Ph-B2 monomer, 1.5 eq) and commercially available tri-acrylate monomer (A3 monomer, 1.0 eq, molar mass M(A3) = 428, 692, or 912 g mol−1) under the catalyzation of DBU (0.225 eq). c Ph polymer (M(A3) = 692 g mol−1) in various solvents. Samples in some solvents are marked by red circles. THF tetrahydrofuran, DCM dichloromethane, EtOH ethanol, DMF N,N-dimethylformamide. d Reprocessing of the Ph polymer (M(A3) = 428 g mol−1) by hot pressing at 180 °C. Scale bar = 0.5 cm. e Reshaping of the Ph polymer (M(A3) = 692 g mol−1) at 100 °C. Scale bar = 0.5 cm.
