Modificação de superficie de polietileno de alta e de baixa densidade

AUTOR(ES)
DATA DE PUBLICAÇÃO

1982

RESUMO

Polyethylene (HDPE and LDPE) surfaces can be modified by impregnation with Fe and Mn oxides. The method used consists in Fe(CO)5 sorption by the plastic and its in situ oxidation. Oxidants used are acidic or basic solutions of KMnO4. Polyethylene can also be impregnated with MnO2 only, by immersion in acidic KMnO4 solutions at temperatures higher than 50°C , In the present work the effects of some variables (oxidation temperature, reagent concentration, sorption and oxidation times) on the amounts of oxides incorporated to the polymers were investigated. LDPE is corroded to a larger extent than HDPE under exposure to acidic permanganate solutions. MnO2 - impregnated HDPE undergoes extensive degration when heated to 190°C. Surface modified polyolefins display a peroxidasic catalytic activity and are thus unprecedent examples of polyolefin-supported heterogeneous catalysts.

ASSUNTO(S)

polietileno

Documentos Relacionados