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Facile modification on the oxygen‐inhibited layer of photopolymerized acrylates via aza‐ Michael addition
Author(s) -
Zhou Junyi,
Allonas Xavier,
Liu Xiaoxuan,
Wu Shanghua
Publication year - 2021
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.6174
Subject(s) - photopolymer , surface modification , photoinitiator , hydroxymethyl , trimethylolpropane , polymer chemistry , michael reaction , materials science , acrylate , uv curing , aqueous solution , fourier transform infrared spectroscopy , benzoin , chemistry , polymer , curing (chemistry) , organic chemistry , chemical engineering , polyurethane , polymerization , catalysis , copolymer , monomer , engineering
In free radical UV curing, the inhibition of the photopolymerization reaction by oxygen leaves in most cases a considerable amount of acryl groups on the surface of cured materials. In the work reported, advantage was taken of the residual acryl CC double bonds as reactive sites for aza‐Michael addition in order to proceed to surface modification. A formulation composed of bisphenol A acrylate and trimethylolpropane triacrylate was cured under UV‐LED ( λ = 405 nm) and the oxygen‐inhibited surface was modified by aza‐Michael addition using several amino compounds such as tris(hydroxymethyl)methylaminomethane, amino‐polydimethylsiloxane and amino acids. The conversion of acryl CC double bonds and the content of functional groups on the surface were measured using Fourier transform infrared and X‐ray photoelectron spectroscopies and confocal Raman microscopy. After modification, the surfaces of samples exhibited diverse hydrophilicity and affinity to aqueous acid/alkali. © 2021 Society of Chemical Industry