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• W2021005344 abstract "Two crystalline structures for nylon 5,6 have been studied by transmission electron microscopy, electron diffraction, and X-ray diffraction. A γ form or an α-like phase can be obtained as a function of the method used to prepare the sample. Structural modeling and energy calculations have been carried out for the second form. Results point to a structure with two hydrogen bond directions as recently postulated for even−odd nylons and odd polyoxamides. It appears therefore that in even−odd and odd−even nylons an α-like structure may be frequently observed, but with two hydrogen bond directions. Our results strongly favor for nylon 5,6 a model in which the methylenes are in an all-trans conformation, while the torsional angles for the CH2−NH and CH2−CO bonds of one residue respectively are φ = +152° and ψ = ±137°. Temperature-induced structural changes have also been studied for nylon 5,6 fibers. Pseudohexagonal packing is obtained near 220 °C in a process which takes place without changes in the hydrogen bond system." @default.
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• W2021005344 date "1998-10-31" @default.
• W2021005344 modified "2023-10-17" @default.
• W2021005344 title "Crystal Structures of Nylon 5,6. A Model with Two Hydrogen Bond Directions for Nylons Derived from Odd Diamines" @default.
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• W2021005344 doi "https://doi.org/10.1021/ma971895b" @default.
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