Modificación Química de nanotubos de haloisita para la preparación de nanocompositos en matriz polimérica de PET.

Published in: Innovation in Education and Inclusion : Proceedings of the 16th LACCEI International Multi-Conference for Engineering, Education and Technology
Date of Conference: July 18-20, 2018
Location of Conference: Lima, Perú
Authors: Laura Eugenia Romero Robles (ITESM campus Monterrey, MX)
Jaime Bonilla Rios (ITESM campus Monterrey, MX)
Alan Alberto Ramirez Guevara (ITESM campus Monterrey, MX)
Full Paper: #406

Abstract:

In this work we report the results of different functionalisations of haloisite nanotubes where non-silanizing reagents such as terephthalic acid and sodium terephthalate were used to modify the surface of the haloisite and achieve greater affinity with respect to a matrix of PET in the formation of nanocomposites. Chemical modifications were also made with sulfuric acid and sodium hydroxide with the intention of increasing the interfacial area by increasing the porosity, as well as decreasing the aluminum concentration of the haloisites with the intention of making them more suitable for use in the packaging industry. Haloisites modified with sulfuric acid and sodium hydroxide were characterized with XRD, diffuse reflectance and FTIR being the last technique performed for each of our modifications. The morphologically modified haloisites were characterized with X-ray diffraction, as well as with the diffuse reflectance technique to quantify the reflectance where a reduction of 40 and 15% in the percentage of reflectance was achieved for the treatment of H2SO4 and NaOH respectively. Studies of haloisite, haloisite modified with sulfuric acid (HNT-H2SO4) and sodium hydroxide (HNT-NaOH) were performed calculating the adsorption of terephthalic acid in haloisites by an adsorption kinetics by UV spectroscopy at 240 nm at different pH where calculate the grams of terephthalic acid per gram of halloisite concluding that the treatment with sulfuric acid decreases the adsorption of terephthalic acid in contrast to the sodium hydroxide treatment as well as the haloisite without modification. ICP characterization was performed to quantify the change of aluminum in haloisite to different concentrations of aluminum obtaining up to 50% in the decrease of aluminum present in the haloisites. In order to achieve a better dispersion of the haloisites in the PET, two methodologies for placing haloisites in the PET in solution treatments were carried out through the previous formation of pores in PET pellets with sodium hydroxide treatment, reaching percentages of 1% of haloisite. In PET, with this, the formation of nanocomposites ready to be added as additives in a PET matrix is ​​successfully obtained.