Preparation and some properties of nylon 46

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Gaymans, R.J. and Utteren, T.E.C. and Berg van den, J.W.A. and Schuyer, J. (1977) Preparation and some properties of nylon 46. Journal of Polymer Science: Polymer Chemistry Edition, 15 (3). pp. 537-545. ISSN 0360-6376

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Abstract:Nylon 46 was synthesized from the salt of 1,4-diaminobutane and adipic acid. High molecular weight polymers could be obtained by reaction for 1 hr at 215°C in a closed system and at least for 1 hr in vacuo at a temperature in the range 290-305°C. The reactions at 290°C were found to have taken place in the solid state and those at 305°C in the melt. The highest molecular weights (Mw ca. 45,000) were obtained by reaction at 290°C with a nylon salt with a pH of 7.8-8.0. The molecular weight characteristics were studied with end-group analysis, viscometry, light scattering, and ultracentrifugation. The polymers were found to be gel-free and monodisperse (Mw/Mn ~ 1.15). Films could be cast from formic acid. From x-ray diffraction patterns, measured on such films, spacings of 3.74 and 4.30 Å were calculated, whereas a long period of 66 Å was also found. The infrared spectra showed all the usual amide bands of even-even polyamides. The melting temperature was found to vary between 283 and 319°C, depending on the thermal history of the sample. Water absorption measured on a cast film showed this to be very hygroscopic (7.5% at 65% RH), while a highly crystalline sample absorbed only little water (1.6% at 65% RH).
Item Type:Article
Copyright:© 1977 Wiley InterScience
Link to this item:http://purl.utwente.nl/publications/70766
Official URL:http://dx.doi.org/10.1002/pol.1977.170150303
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