Visible-Light Sensitive Reworkable Resins: A Rheological Study

A rheological study of visible-light sensitive reworkable photocuring resins was carried out using reworkable monomers. A dimethacrylate monomer containing tertiary ester units in a molecule and a methacrylate monomer, which has both an epoxy moiety and a thermally-cleavable tertiary ester moiety in...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2020/12/15, Vol.33(6), pp.637-642
Main Authors: Okamura, Haruyuki, Kawabe, Kunihiko, Tachi, Hideki
Format: Article
Language:English
Subjects:
High temperature
Light irradiation
Monomers
Photo-degradation
Photocuring
Resins
Reworkable resin
Rheological properties
Rheological study
Rheology
Ultraviolet radiation
Visible light
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Summary:A rheological study of visible-light sensitive reworkable photocuring resins was carried out using reworkable monomers. A dimethacrylate monomer containing tertiary ester units in a molecule and a methacrylate monomer, which has both an epoxy moiety and a thermally-cleavable tertiary ester moiety in a molecule, were employed as the reworkable monomers. The reworkable monomers were successfully cured by green light irradiation (530-nm light) using a visible-light sensitive photoradical initiator. When the cured reworkable resins were baked after UV light irradiation (365-nm light) in the presence of a photoacid generator, the storage moduli of the cured resin decreased at elevated temperatures. The decreased storage moduli revealed by rheological studies were due to the acid-catalyzed decomposition of the tertiary ester linkages in the cured reworkable monomers. The effect of the chemical structure on the rheological properties was discussed.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.33.637