Use of Lead (II) Sulfide Nanoparticles as Stabilizer for PMMA Exposed to Gamma Irradiation

AUTOR(ES)

Garcia, Olga Pinheiro, Albuquerque, Marília Cordeiro Carneiro de, Aquino, Kátia Aparecida da Silva, Araujo, Patricia Lopes Barros de, Araujo, Elmo Silvano de

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

2015-04

RESUMO

Lead (II) sulfide (PbS) were synthesized by sonochemical method and crystals with cubic structure exhibit aggregated nanoparticles with size in the range of 50-100 nm. Commercial Poly(methyl methacrylate) (PMMA) containing the PbS nanoparticles (PbS-NP) exposed to gamma irradiation were investigated and both the viscosity-average molar mass (Mv) and degradation index (DI) values were measured. Ours results showed decreases in molar mass when the systems were gamma irradiated, i. e., random scission effects that take place in the main chain. On the other hand, DI results showed that the addition of PbS-NP at 0.3 wt% into the PMMA matrix decreased 100% the number of main chain scissions. Results about the free radical scavenger action of the PbS-NP were obtained by use of 2,2-diphenyl-1-(2,4,6-trinitrophenyl)-hydrazyl radical (DPPH) and are discussed in this study. Analysis of infrared spectra, refraction index, mechanical, and thermal properties showed influence of the PbS-NP in the physical behavior of PMMA.

Documentos Relacionados

• Stibnite Nanoparticles as a New Stabilizer for Poly (Methyl Methacrylate) Exposed to Gamma Irradiation
• Use of gamma irradiation to eliminate DNA contamination for PCR.
• Use of modified silica gel for concentrating Pb (II) and Cd (II) occurring in form of complex anions
• Increase of radiation resistance of a soil microflora exposed to long-term gamma irradiation.
• Markers of early renal changes induced by industrial pollutants. II. Application to workers exposed to lead.