Cross‐linking photopolymerization of monoacrylate initiated by benzophenone

ABSTRACT The chain‐end structure of the photopolymerized acrylate using benzophenone as an initiator was investigated as well as polymerization behavior. Dodecyl acrylate was used as a monomer in this study. Gelation occurred during ultraviolet (UV) irradiation, whereas a cross‐linker was not employ...

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Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2018-07, Vol.56 (14), p.1545-1553
Main Authors: Sanai, Yasuyuki, Kagami, Shinobu, Kubota, Kouzou
Format: Article
Language:English
Subjects:
Copolymerization
Gelation
Hydroxyl groups
Ionization
Ions
MALDI
Mass spectra
Monomers
Photopolymerization
Polymerization
Polymers
radical polymerization
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Summary:ABSTRACT The chain‐end structure of the photopolymerized acrylate using benzophenone as an initiator was investigated as well as polymerization behavior. Dodecyl acrylate was used as a monomer in this study. Gelation occurred during ultraviolet (UV) irradiation, whereas a cross‐linker was not employed. Conversion‐time profile below gel point gave a linear first‐order plot suggesting that the steady‐state was held throughout polymerization. Matrix‐assisted laser desorption/ionization time‐of‐flight mass spectra of the resultant polymer indicated that most polymers had an acryloyl group at one of the chain‐ends, while some polymers had an acryloyl group at each chain‐end. The cross‐linking reaction leading to gelation would have been caused by the subsequent copolymerization of the residual monomer with the latter polymer having two acryloyl groups. Dissolved oxygen in the monomer solution influenced the polymer structure giving hydroxyl group at chain‐end. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1545–1553 Photopolymerization of dodecyl acrylate was conducted using benzophenone as an initiator. Gelation occurred during UV irradiation. The MALDI‐TOF‐MS spectra of the resultant polymer indicated that most polymers had an acryloyl group at one of the chain‐ends, while some polymers had an acryloyl group at each chain‐end. The crosslinking reaction leading to gelation would have been caused by subsequent copolymerization of the residual monomer with the latter polymer.
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.29038