Title: EFFECT OF NANO PARTICLE ADDITION ON THE PROPERTIES OF POLYUREA
Abstract: This research is aimed at improving the properties of polyurea by adding graphene and clay nano particles. The purpose of adding these nano particles is to improve the glass transition temperature of the polyurea layer and to improve its barrier properties. Graphene and Clay nano particles were added in different concentrations to polyurea and thin films were prepared by allowing the mixture to cure in a mold. These samples were then characterized using DMA, DSC, XRD, and SEM to study the structure and properties. The graphene and clay nano particles could potentially improve the barrier properties of polyurea. To assess the gas permeability characteristics of these samples an instrument was designed adhering to the standard test method documented in ASTM D143482. The results indicated that the increase in concentrations of additives decreased the glass transition temperature and decreased the crystal orientation ratio. SEM was used to investigate the micro cracks that developed as a result of exposure to gases at low temperatures. Our studies found that higher concentrations of nano-particles resulted in less microcracking to the polyurea after being exposed to gases at low temperatures. It has also been observed that the addition of nano particles reduces the permeability of the barrier layer. All these factors also contributed to a change in the mechanical and physical properties of polyurea.
Authors: Vishanth Uppu, T. Vallejo, R. Vaidyanathan
Conference: CAMX 2017 –Orlando