Abstract
The internal stress and shrinkage of bisphenol type epoxide resin compounded with spiro ortho-ester resin were investigated by measuring the change of density and the strain of the steel ring embedded in the cured resins. Internal stress was absent in the rubbery region and was mainly induced by shrinkage in the glassy region. The shrinkage in the glassy region seems to be directly converted to internal stress because the motion of network segments is restricted in this region. The internal stress decreased with increasing fraction of spiro ortho-ester resin in the cured system. The reduction of internal stress was independent of the expansion of the cured resin caused by the reaction of spiro rings during the curing process. This reduction was due to the decrease in the glass transition temperatureT g of the cured resins, that is the decrease in the shrinkage occurring in the cooling process fromT g to room temperature.
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Shimbo, M., Ochi, M., Inamura, T. et al. Internal stress of epoxide resin modified with spiro ortho-ester type resin. J Mater Sci 20, 2965–2972 (1985). https://doi.org/10.1007/BF00553061
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DOI: https://doi.org/10.1007/BF00553061