The dynamics of tetrapropylammonium (TPA) cations occluded during the synthesis of a siliceous MFI zeolite were investigated by several 13C high-resolution NMR methods. This work follows and complements a previous 1H broad-line NMR study of this material. The evolution of the 13C cross polarization
The compatibility study of polycarbonate-polyvinyl pyrrolidone blend using high-resolution solid-state nuclear magnetic resonance
✍ Scribed by Edemilsom P. Da Silva; Maria Ine˘s B. Tavares
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 152 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The combining nuclear magnetic resonance techniques in the solid state permit the evaluation of the polymeric systems homogeneity. In the polycarbonatepoly(vinyl pyrrolidone) (PVP) blends, the response of proton spin-lattice relaxation time in the rotating frame was the determinant to obtain information on the transition when the quantity of PVP is close to 40% by weight and a better organization of amorphous phase was detected.
📜 SIMILAR VOLUMES
Benzoxazines derived from bisphenol-A, formaldehyde, and primary amines were characterized using 13 C solid-state NMR spectroscopy. The two 1,3benzoxazines studied in this work are 2,2Ј-(3-methyl-4-dihydro-1,3,2-benzoxazine)propane, (B-m) and 2,2Ј-(3-phenyl-4-dihydro-1,3,2-benzoxazine)propane (B-a).
A difunctional 1,3-benzoxazine compound, 2,2Ј-(3-phenyl-4-dihydro-1,3,2benzoxazine)propane (B-a), derived from bisphenol-A, 15 N-enriched aniline, and formaldehyde was synthesized and characterized using 15 N-NMR and 13 C-NMR spectroscopies. The observed resonances in the solid-state 15 N-and 13 C-N