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>Three‐stage interaction of dimethyl phthalate, dibutyl phthalate, and poly(vinyl acetate) with poly(methyl methacrylate)
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Three‐stage interaction of dimethyl phthalate, dibutyl phthalate, and poly(vinyl acetate) with poly(methyl methacrylate)
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机译：Three‐stage interaction of dimethyl phthalate, dibutyl phthalate, and poly(vinyl acetate) with poly(methyl methacrylate)
AbstractThe interaction of dimethyl phthalate (DMP),n‐dibutyl phthalate (DBP), and poly(vinyl acetate) (PVAc) with poly(methyl methacrylate) (PMMA) was studied. Changes in the tensile strength, elastic modulus, and percentage elongation at break of the PMMA‐additive films produced were followed using the Instron testing machine. The three additives produced (1) an initial plasticization, with a decrease in tensile strength and modulus and a possible increase in elongation; (2) an antiplasticization, with accompanying increase in tensile strength and modulus and an anomalous increase in elongation; and (3) a final plasticization, with a marked decrease in tensile strength and modulus and a definite increase in elongation of PMMA. The three effects were influenced by the molecular weight of the PMMA. A spacer effect by the interposition of the molecules of the additives between those of PMMA is proposed for the initial plasticization, while for the final plasticization, a lubrication action of the plasticizers on PMMA is suggested. Antiplasticization is explained by the formation of secondary bonds between the antiplasticizer and the PMMA molecu
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