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• W2028777297 abstract "The size of phosphate-glass (Pglass) particles dispersed in a polyamide-6 (PA6) matrix by melt blending has been characterized by 1H−31P solid-state nuclear magnetic resonance (NMR). 1H spin diffusion from ∼75% of the 1H in the glass to the polyamide is observed within 50 ms, indicating proximity on a 30 nm scale. Fast dephasing of a quarter of the 31P magnetization by dipolar couplings to polyamide protons in 31P{1H} heteronuclear recoupling with dephasing by strong homonuclear interactions of protons (HARDSHIP) NMR shows that ∼25% of the Pglass is within 0.5 nm from the polyamide. This is confirmed by 1H−31P heteronuclear correlation NMR spectra with inverse T2,H filtering, which document relatively fast (1 ms) cross polarization from PA6 protons, identified by their upfield chemical shift and short transverse relaxation time T2,H, to a significant fraction of 31P in the glass. The 31P spectrum associated with the polyamide 1H reveals that the phosphate sites near the polyamide matrix are chemically altered but differently than previously observed in Pglass−polyethylene hybrids, where no such contact was proven. As expected, the 31P sites that cross-polarize from the polyamide protons also exhibit pronounced dephasing in 31P{1H} HARDSHIP experiments. HARDSHIP experiments after cross polarization and 31P spin diffusion experiments indicate that the ∼25% of phosphate that is within 0.5 nm from the polyamide is not dispersed in the polymer but on the surface of ∼10 nm diameter Pglass particles. This study represents the first conclusive evidence of intimate mixing of the hybrid components. Further, it suggests that this is an excellent model system for exploring new routes for driving organic polymers and inorganic glass to self-assemble into useful organic/inorganic hybrid materials." @default.
• W2028777297 created "2016-06-24" @default.
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• W2028777297 date "2006-11-24" @default.
• W2028777297 modified "2023-10-16" @default.
• W2028777297 title "Detection of Nanometer-Scale Mixing in Phosphate-Glass/Polyamide-6 Hybrids by ¹H−³¹P NMR" @default.
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• W2028777297 doi "https://doi.org/10.1021/cm0613410" @default.
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