Carbon-13 solid-state NMR study of the interfacial region in glass-filled polyamide 6 composites.
13C-labeled (g-aminopropyl)triethoxysilane (I) was used to enhance the sensitivity and selectivity of solid-state 13C NMR in an investigation of the interfacial region of microcomposite samples composed of polyamide-6 (II), glass microspheres, and I. From the MAS spectra, some indication was obtained for the occurrence of amide formation between the II carboxylic acid end groups and the amines of I but the evidence is not overwhelmingly strong. Several relaxation times, i.e., T1(13C), T2(13C), T1r(1H), T1r(13C), and T1S(1H -> 13C), of both I and II were studied as a function of sample compn., and their behavior can be explained on the basis of the presence of entanglements and interpenetration of the polysiloxane and polyamide networks.
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