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- W2031958561 abstract "Properties of films prepared from the following poly(piperazine amides) were examined: poly(2-methylpiperazine fumaramide); poly(trans-2,5-dimethylpiperazine fumaramide); poly(trans-2,5-dimethylpiperazine mesaconamide); poly(trans-2,5-dimethylpiperazine terephthalamide); poly(trans-2,5-dimethylpiperazine isophthalamide); poly(trans-2,5-dimethylpiperazine adipamide). Mechanical properties of these films are good; they have in fact a high tensile strength and in accordance with the rigidity of the polymer chain, low elongations and a high modulus of elasticity. Optical properties are very good. Since the films have a high water absorption, permeability to water vapour is very high while treatment of the films in water causes lowering of mechanical properties. Resistance to thermal ageing in an atmosphere of nitrogen is good. Among the various films considered those obtained from polymers with an unsaturated acid (fumaric and mesaconic) seem to show the best properties." @default.
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- W2031958561 date "1971-11-01" @default.
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- W2031958561 title "Properties of piperazine homopolyamide films" @default.
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- W2031958561 doi "https://doi.org/10.1016/0032-3861(71)90087-5" @default.
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