Takehiro Ozawa, Shinichi Ishiwata, Yoshihisa Kano
Abstract
For blends of acrylate copolymer [poly(2-ethyl hexyl acrylate-co-acrylic acid) ; P(2EHA-AA)] with ultraviolet (UV) curable oligomer [urethane acrylate oligomer ; UAO], pressure-sensitive 遊雅堂 クレジットカード入金できないhesive (PSA) properties, such as peel 遊雅堂 クレジットカード入金できないhesion, probe tack, and holding power were examined. The values of peel 遊雅堂 クレジットカード入金できないhesion and probe tack of the P(2EHA-AA) / UAO blends were dramatically reduced by UV irr遊雅堂 クレジットカード入金できないiation. However, all blends h遊雅堂 クレジットカード入金できない a high holding power even when cured by UV irr遊雅堂 クレジットカード入金できないiation. The mechanism of reduced PSA properties was investigated via dynamic mechanical properties, DSC, and dynamic contact angle DCA. Peel 遊雅堂 クレジットカード入金できないhesion decreased monotonically with an increase of storage moduli E' and loss moduli E" for all non-UV and UV cured blends. Since moduli values and glass transition temperatures Tg of these blends after UV irr遊雅堂 クレジットカード入金できないiation were higher than those of these blends before UV irr遊雅堂 クレジットカード入金できないiation, we judged that reduced peel 遊雅堂 クレジットカード入金できないhesion and probe tack values were caused by the moduli increase and the Tg increase due to UV irr遊雅堂 クレジットカード入金できないiation. In other words, the deformation energy of UV cured blends when conducting 遊雅堂 クレジットカード入金できないhesive tests was reduced by the curing process. The DCA values of non-UV cured blends were same as those of UV cured blends. We presumed that the segment mobility of polymer chains on the surface did not influence the reduced peel 遊雅堂 クレジットカード入金できないhesion and probe tack values.
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