Impact of clay modifier on structure, thermal, mechanical and transport properties in polyurethane/Maghnite nanocomposites as barrier materials

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Abstract In the present study, thermoplastic polyurethane (TPU) nanocomposites based on maghnite as an inorganic reinforcing phase were synthesized. The result of this study was to evaluate the gas barrier property of a thermoplastic polyurethane (TPU) material containing clay nanoparticles. The preparation of the thermoplastic polyurethane prepolymer with NCO terminations was carried out by the in situ solution polymerization method. The clay was previously modified by intercalating 12-aminododecanoic acid NH2(CH2)11COOH (12-Mag) molecules. The polyethylene glycol / tolylene 2,4-diisocyanate (PEG/TPI) matrix was extensively compatibilized with the organo-modified clay, 12-Maghnite. The objective of this study is to evaluate the effects of the use of organoclay on the development of thermoplastic polyurethane (TPU) nanocomposites composed of 1, 3, 5 and 7 wt% organoclay. The results obtained by XRD, by Transmission and Scanning Electron Microscopy (TEM, SEM) revealed that the modified maghnite was well dispersed at 1 wt% in the polyurethane matrix. Thermogravimetric (TG) tests have shown that the nanocomposites samples also have better thermal stability. Using the membrane separation test device, gas permeability was examined. Significant improvements in barrier properties were observed. The mechanical properties of the nanocomposites were evaluated as a function of the clay filler used and the TPU matrix.

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