The Effects of Intumescent Flame Retardant and Nanoclay on Mechanical and Thermal Expansion Properties of High Density Polyethylene Composites

Abstract

In this work, ammonium polyphosphate and melamine were added as a flame retardant to the nanoclay reinforced high-density polyethylene composites. Ammonium polyphosphate and melamine were added at weight ratios of 0 wt% and 20 wt% to the polymer matrix and their proportions are changed. The addition of nanoclay was carried out at weight ratios of 2 wt% to the polymer matrix. Blending operations were performed by premixing with a mechanical stirrer and melt extrusion technique with twin screw extrusion, respectively. The samples were produced by injection molding. Tensile tests, three-point bend tests, tear tests, the Izod impact tests, and thermomechanical analysis were carried out to investigate the mechanical and thermal expansion properties. Mechanical and thermomechanical test results showed that addition of intumescent flame retardant systems and nanoclay decrease the tensile strength and coefficient of linear thermal expansion values while increasing flexural strengths slightly. However, it has been observed that the addition of additives increases the flexural modulus and density of the polymer composites.

Characterization of Composites Manufactured Through Reshaping of EoL Thermoplastic Polymers Reinforced with Recycled Carbon Fibers

“…Moreover, the Charpy impact test was carried out also on un-notched specimens of aged composites, which are the composite submitted only to the accelerated aging, and therefore before undergoing to the recycling process. Commonly, the un-notched impact resistance of a material may be one or two orders of magnitude higher than the notched impact resistance for the same material, as reported in several works [34][35][36] and the theory of work of fracture can explain these differences. As a matter of fact, in the un-notched impact strength the entire test piece receives the impact energy caused by the hammer striking, whereas in determining the notched impact strength, breakage is promoted by concentrating the impact energy on the notch.…”

Investigation of the effect of carbon black and flame retardant agent on the fire properties of elastomer-based composite materials with high elongation capability

“…SRA sistemi genellikle asit, karbon ve gaz kaynaklı üç ana madde içerir. Genellikle kombinasyon olarak kullanılırlar ve tipik bir örnek amonyum polifosfat (APP), pentaeritritol (PER) ve melamin (MEL)'nin bileşiğidir [13], [19].…”