Pré-tratamento físico: um procedimento importante para o aumento na resolução espectral em estudos de microestrutura de polímeros por RMN13C em solução

Pedroza, Oscar Javier Osório; Tavares, Maria Inês B.

doi:10.1590/s0104-14282004000400012

Cited by 1 publication

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References 3 publications

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“…The NMR spectroscopy is widely used to study the chemical assignments and molecular dynamics of various types of materials detected through the intermolecular interaction, dispersion and the distribution of their components [37]- [39]. The solution 13 C NMR spectrum allows identifying the different types of carbon in samples, facilitating study of the microstructure of microparticles [40] [41]. By integrating the areas under the peaks of the microparticles in the NMR 13 C spectra, it was possible to confirm the proportion of each polymer in the system, as reported in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Development of Polycaprolactone/Poly(Vinyl Alcohol)/Clay Microparticles by Spray Drying

Monteiro¹,

Rodrigues²,

Miguez³

et al. 2016

MSA

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In this study, nanostructured microparticles was developed with polycaprolactone (PCL), poly(vinyl alcohol) (PVAL) and nanoparticles of the commercial sodium clay NT-25® by using the spray drying technique. The systems obtained were characterized by Nuclear Magnetic Resonance (NMR), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Dynamic Laser Light Scattering (DLS) and Differential Scanning Calorimetry (DSC). The NMR 13 C and FTIR techniques showed that both polymers were present in the microparticles and the DSC analysis revealed a small variation in the glass transition temperature of the PCL. The XRD and SEM analyses showed that the microparticles produced were amorphous and had a concave morphology. The NT-25 nanoload reduced the microparticles' size due to the multiple interactions formed in the hybrid nanocomposite material. Therefore, it was possible to develop microparticles by using biodegradable and biocompatible polymers, with different polarities, allowing the incorporation of hydrophilic and hydrophobic materials and enabling the inclusion of otherwise incompatible materials in the same system.

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