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- W2029277265 abstract "The plastic behavior of a series of amorphous semi-aromatic polyamides (SAPA-A) was investigated in compression mode at temperatures ranging from −100°C to their glass transition temperatures. Data analysis was mainly based on the inspection of the temperature dependence of yield stress, σy, plastic flow stress, σpf, and strain softening, SSA=σy−σpf. The activation volumes, V0, and the index of non-elastic behavior, I, were also determined, to account for the sensitivity of plastic deformation to strain rate and for the relative easiness of elastic and non-elastic processes, respectively. Some connections have been established between the nature of the molecular motions and the values of σy, σpf, SSA, V0, and I, thanks to the knowledge of the relaxation behavior of these materials. The role played by the secondary relaxation motions (and especially by those presenting a cooperative character) was highlighted, in agreement with our conclusions in earlier reports on the subject. In addition, the molecular analysis proposed for describing the plastic deformation of the SAPA-A materials was shown to hold for other polymers also bearing phenylene rings in the main chain, namely some semi-aromatic polyamides of another series (SAPA-R) and aromatic polycarbonates. Interestingly, the line of reasoning proposed here proved to be suitable also to account for the plastic deformation characteristics of various vinyl polymers and copolymers." @default.
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- W2029277265 date "2001-10-01" @default.
- W2029277265 modified "2023-09-26" @default.
- W2029277265 title "Molecular analysis of the plastic deformation of amorphous semi-aromatic polyamides" @default.
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- W2029277265 doi "https://doi.org/10.1016/s0032-3861(01)00371-8" @default.
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