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vol.56 número4DILUTED ACID PRETREATMENT OF PINUS RADIATA FOR BIOETHANOL PRODUCTION USING IMMOBILIZED SACCHAROMYCES CEREVISIAE IR2-9 IN A SIMULTANEOUS SACCHARIFICATION AND FERMENTATION PROCESSSYNTHESIS, CHARACTERIZATION AND ANTIOXIDANT ACTIVITY OF SOME TRANSITION METAL COMPLEXES WITH TERPENOID DERIVATIVES índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

PEREZ-GUERRERO, A; LISPERGUER, J  e  ORELLANA, F. INFLUENCE OF SILICA NANOPARTICLES ON THE THERMOMECHANICAL PROPERTIES OF RECYCLED POLYSTYRENE. J. Chil. Chem. Soc. [online]. 2011, vol.56, n.4, pp.907-910. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072011000400018.

Polystyrene from packing materials (rPS) was reinforced with 1, 3 and 5 % of silica prepared by the sol-gel method, through a blending process . The thermal, morphological and mechanical properties were compared with those of the virgin polystyrene (PS). The results show that the glass transition temperature (Tg), storage modulus (E') and impact strength of the pure rPS and silica-rPS composites were higher than those of virgin PS. Thermogravimetric analysis revealed that the thermal stability of virgin PS was slightly greater than that of the rPS. The addition of silica to rPS increased their thermal stability to similar values of the virgin PS. SEM studies showed that the silica nanoparticles had an uniform size but its dispersion into the polymer matrix was not homogeneous. These results suggest that postconsumer PS can be used to obtain composite materials with good mechanical and thermal properties.

Palavras-chave : Polystyrene; nanocomposites; silica; thermal properties; morphology.

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