Abstract
Mechanisms of deformation in a series of transparent RTPMMA (rubber-toughened poly (methyl methacrylate)) polymers have been studied by measuring volume changes during creep in tension at 20° C. Volume strains remained small throughout each test, even at total extensions greater than 6%, although the material became heavily stress whitened at strains above about 3%. It was concluded that the dominant mechanism of creep is shear yielding. Rate coefficients, defined by fitting the creep data to the Andrade equation, increase exponentially with applied stress, in accordance with the Eyring equation. Apparent activation volumes increase with rubber content, from 1.55 nm3 for PMMA itself, to 2.89 nm3 for RTPMMA containing 36 vol % of rubber particles. These observations provide an explanation of the toughness and ductility of RTPMMA.
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Bucknall, C.B., Partridge, I.K. & Ward, M.V. Rubber toughening of plastics. J Mater Sci 19, 2064–2072 (1984). https://doi.org/10.1007/BF00550274
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DOI: https://doi.org/10.1007/BF00550274