The compatibility study of polycarbonate-polyvinyl pyrrolidone blend using high-resolution solid-state nuclear magnetic resonance

Abstract

ABSTRACT: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.

Solid‐state carbon‐13 NMR study of material composites based on sugarcane bagasse and thermoplastics polymers

“…To understand their molecular dynamics, and hence, control the relation between structure and properties of such materials, we employed solid‐state nuclear magnetic resonance. NMR is a powerful tool that permits studing samples in different aspects and to obtain response on their dynamic behavior 10–19. It is known that solid‐state NMR techniques provide good information on chemical structure and sample homogeneity 10–16.…”

“…A comparison between magic angle spinning (MAS) and CPMAS spectra shows the existence of different domains or microdomains in a sample15, 16 as well as to determine its chemical structure. In the case of blends and composites, one can get information on their heterogeneity 12, 16–24. The distribution form of a series of CPMAS spectra obtained from variable contact‐time experiment, permits one to observe distinct regions that have different mobilities, and also if one of the components influences the polarization transfer way of the other one, which occurs as a consequence of the interaction process 12, 17–24.…”

“…In the case of blends and composites, one can get information on their heterogeneity 12, 16–24. The distribution form of a series of CPMAS spectra obtained from variable contact‐time experiment, permits one to observe distinct regions that have different mobilities, and also if one of the components influences the polarization transfer way of the other one, which occurs as a consequence of the interaction process 12, 17–24. Proton spin‐lattice relaxation time in the rotating frame ( T ρ) is a parameter that evaluates the blends and composites behavior in terms of sample interactions.…”

Solid‐state NMR and XPS studies of EVA/sugarcane composites

“…This study employed solid‐state NMR and XPS. Solid‐state NMR was used to obtain information on molecular dynamics, and also to evaluate the microscopic homogeneity between composites components by the relaxation times 3–9. XPS permitted obtaining responses on the surface of these materials 10.…”