Carbon-13 NMR solid state study of polyvinylpyrrolidone–polyethylene oxide blends

ABSTRACT:It is well known that nuclear magnetic resonance spectroscopy (NMR) is a powerful method to characterize blends compatibility at the molecular level. In this work binary blends formed by poly(methylmethacrylate)/ poly(ethylene oxide), PMMA/PEO, were investigated by different solution and solid state NMR techniques to obtain information on blends homogeneity and compatibility. It was characterized that the values of T 1 H obtained by variable contact time and delayed contact time experiments, for each composition, were distinct and this fact suggests that regions with different molecular mobilities exist, as a consequence of blending interaction.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solution and solid state nuclear magnetic resonance investigation of poly(methylmethacrylate)/ poly(ethylene oxide) blends

Diniz

Tavares

2003

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

Stael

Tavares

2001

ABSTRACT:The composites formed by sugarcane bagasse and thermoplastic polymers, such as polypropylene (PP), polyethylene (PE), and ethylene-co-vinyl acetate (EVA), have been analysed by carbon-13 high-resolution solid-state nuclear magnetic resonance (NMR), employing crosspolarization magic angle spinning (CPMAS); variable contact-time experiment and proton spin-lattice relaxation time in the rotating frame. NMR responses showed that these techniques can be used to observe the degree of compatibility and homogeneity of different polymers composites.

A high‐resolution solid‐state NMR investigation of molecular mobility of poly(methyl methacrylate)/poly(vinyl pyrrolidone)/poly(ethylene oxide) ternary blends

Diniz¹,

Tavares²

2006

ABSTRACT:The ternary blends of poly(methyl methacrylate)/poly(vinyl pyrrolidone)/poly(ethylene oxide), PMMA/PVP/PEO, were prepared by melting process, using a Haake plastograph, and nuclear magnetic resonance spectroscopy (NMR) was used as a methodology to characterize the molecular mobility of blend components, because NMR has several techniques that allow us to evaluate polymeric materials in different time scales. The NMR results showed that the blends were miscible on a molecular level. The values of proton lattice relaxation time in the rotating frame (T 1 H) indicate that the ternary blend interaction did not reduce the intermolecular distance, because it is dipole-dipole. The molecular motion of each component, even in the miscible amorphous phase and the addition of PEO, has a definitive effect on the PMMA molecular mobility.