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Study of the characterization and curing of benzoxazines using 13 C solid‐state nuclear magnetic resonance
Author(s) -
Russell Ver M.,
Koenig Jack L.,
Low Hong Yee,
Ishida H.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19981114)70:7<1413::aid-app16>3.0.co;2-0
Subject(s) - curing (chemistry) , solid state nuclear magnetic resonance , solid state , materials science , characterization (materials science) , nuclear magnetic resonance , polymer chemistry , chemistry , physics , nanotechnology
Benzoxazines derived from bisphenol‐A, formaldehyde, and primary amines were characterized using 13 C solid‐state NMR spectroscopy. The two 1,3‐benzoxazines studied in this work are 2,2′‐(3‐methyl‐4‐dihydro‐1,3,2‐benzoxazine)propane, ( B‐m ) and 2,2′‐(3‐phenyl‐4‐dihydro‐1,3,2‐benzoxazine)propane ( B‐a ). Solid‐state 13 C‐NMR spectra were obtained for B‐m and B‐a and the observed peak positions were noted. These resonances agreed well with chemical shifts calculated based on the chemical structure. Samples of B‐m and B‐a were cured at two different temperatures: 150 and 200°C. The polymerizations induced spectral changes including new resonances, intensity changes, and line‐width broadenings. Kinetic analysis of the curing data gave different kinetic parameters for the two cure temperatures, which is expected since the first cure temperature is below the material's glass transition temperature (T g ) while the second cure temperature is above the T g . © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 1413–1425, 1998