LOW DENSITY POLYETHYLENE (LDPE) NANOCOMPOSITES WITH PASSIVE AND ACTIVE BARRIER PROPERTIES

作者：Perez Monica A^*; Rivas Bernabe L; Garrido Miranda Karla A; Campos Requena Victor H; Martinez Miguel; Castano Johanna; Maldonado Alvaro

来源：JOURNAL OF THE CHILEAN CHEMICAL SOCIETY, 2014, 59(2): 2442-2446.

DOI：10.4067/S0717-97072014000200009

• Low Density Polyethylene
• Nanocomposites
• Carvacrol
• Montmorillonite
• Tensile properties
• Crystallization
• Oxygen permeability
• Antimicrobial activity

Nanocomposites based on Low Density Polyethylene (LDPE) containing organically modified montmorillonite (OMMT) and polyethylene grafted with maleic anhydride (PE-g-MA) were obtained by the mixing molten state method at 130 degrees C (LDPE/PE-g-MA/Cv/OMMT). Furthermore, in order to obtain a material with active barrier properties, carvacrol (Cv) was incorporated into the nanocomposite (LDPE/PE-g-MA/Cv/OMMT). Carvacrol is an essential oil component with a high antimicrobial, antifungal, and antiparasitic capability. The nanocomposites were characterized by XRD, DSC, TGA, oxygen permeability, and tensile test. %26lt;br%26gt;The nanocomposites without Cv (LDPE/PE-g-MA/OMMT) showed an intercalated morphology (confirmed by the X ray diffraction analysis), an improved percentage of crystallinity and a reduced permeability to oxygen (25%) as compared with LDPE. The rigidity of the resulting material correlated with the clay content as expected. %26lt;br%26gt;The nanocomposite containing Cv (LDPE/PE-g-MA/Cv/OMMT) also show intercalated morphology with a greater displacement between the clay layers as compared with the nanocomposite without Cv produced by intercalation of the antimicrobial agent between the layers. The antimicrobial activity of (LDPE/PE-g-MA/Cv/OMMT) was observed by the reduction or inhibition on bacterial (Escherichia coli and Staphylococcus aureus) growth.

• 出版日期2014-7