The copper‐catalyzed azide/alkyne cycloaddition reaction (CuAAC) has emerged as the most useful “click” chemistry. Polymer science has profited enormously from CuAAC by its simplicity, ease, scope, applicability and efficiency. Basic principles of the CuAAC are reviewed with a focus on homogeneous and heterogeneous catalysts, ligands, anchimeric assistance, and basic chemical principles. Recent developments of ligand design and acceleration are discussed.
A series of castor-oil-modified hyperbranched polyurethanes were synthesized via an A 2 þ B 3 approach based on castor oil, macroglycol poly(e-caprolactone)diol or poly(ethylene glycol) (PEG), and diphenyl methane diisocyanate, with or without a chain extender. The yield of the product was 95%, and the polymers were soluble in common organic polar solvents. The synthesized polymers were characterized with Fourier transform infrared spectroscopy, NMR, wide-angle X-ray diffraction, and gel permeation chromatography measurements. The degree of branching of the polymers was calculated from their respective 1 H-NMR spectra with the help of model compounds and found to be varied from 0.7 to 0.8. The hard-segment content, the nature of the macroglycol, and the composition of the polymers had prominent effects on the thermal degradation and crystallization of the hyperbranched polymers. The crystallization of poly(ecaprolactone) and PEG as soft segments occurred well in the hyperbranched polymers.
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