Abstract
In order to reduce the internal stress of cured epoxy resin generated by shrinkage in the cooling process from cure temperature to room temperature, two kinds of acrylic polymers were introduced byin situ UV radiation polymerization prior to curing. Polybutyl acrylate (A) and butyl acrylate-monoethylene glycol dimethacrylate copolymer (molar ratio 95∶5) (B) were used as the acrylic polymer. In the A-modified resin, a heterogeneous structure with spherical submicrometre domains were formed. In the B-modified resin, irregularly shaped submicrometre domains in which the microphase separation occurred were observed. The modulus of cured epoxy resin decreased as a result of the modifications, and was lower in the B-modified resin than in the A-modified resin. Therefore the internal stress decreased more effectively in the B-modified resin.
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Nakamura, Y., Yamaguchi, M., Iko, K. et al. Internal stress of epoxy resin modified with acrylic polymers having crosslinks produced byin situ UV radiation polymerization. J Mater Sci 25, 2711–2716 (1990). https://doi.org/10.1007/BF00584869
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DOI: https://doi.org/10.1007/BF00584869