Morphology of the poly(vinyl alcohol)–poly(vinyl acetate) copolymer in macrodefect-free composites: a 13C magic-angle-spinning nuclear magnetic resonance and 1H spin-diffusion study
作者： ANGIOLINA COMOTTI , ROBERTO SIMONUTTI , PIERO SOZZANI
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摘要: A study was made of the macrodefect-free (MDF) composite based on aluminate cement and a poly(vinyl alcohol)–poly(vinyl acetate) (PVAc) copolymer by 13C cross-polarization magic-angle-spinning nuclear magnetic resonance. The spectra were run both MDF in order to observe atomic environments carbon nuclei. An analysis intramolecular hydrogen bonds showed stronger modification sample containing CaAl2O4 (CA) than that Ca3Al2O6 (C3A). From spectra, it seen deacetylation had occurred, there interaction between acetate groups calcium aluminium ions. Proton relaxation times laboratory frame, T1(H), rotating T1ρ(H), exploited for dimension polymer matrix composites. extended interphase identified CA. comparison with behaviour silicates Ca3SiO5–PVAc highlights better mixing phases composites
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