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Investigation of Thermal Aging of Polyamide 4,6 by 1H Solid-State NMR

✍ Scribed by Dan E. Demco; Victor M. Litvinov; Gabriel Rata; Crisan Popescu; Kim-Hô Phan; Angelika Schmidt; Bernhard Blümich

Book ID
102483705
Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
375 KB
Volume
208
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The thermal aging of polyamide 4,6 was investigated by DSC, SEM, WAXS, and ^1^H solid‐state NMR. Phase composition, chain mobility, morphology, and domain sizes were determined as a function of aging time. Proton transverse magnetization relaxation was measured at low resonance frequency, ^1^H wide‐line NMR spectra and ^1^H spin‐diffusion experiments were made at high resonance frequency. The NMR investigation shows that the aging process affects the rigid (crystalline), semi‐rigid (crystalline/amorphous interface), and the mobile (amorphous) fraction of polyamide 4,6. The amount of rigid (crystalline) fraction increases by about 10% upon aging at 200 °C for 1 000 h at the expense of the interfacial fraction. Chain mobility in crystalline phase is reduced upon aging suggesting perfections of the crystalline order.

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