In textile industry, production and consumption of textiles produce huge amount of waste every year, rendering its main conclusion that it is one of the most polluting industry. To counter the problem, reinforcing waste textile fiber with polymeric materials is one of the measures for reducing textile industry’s negative contribution towards environment. In the current work, waste textile fiber reinforced polypropylene composites were prepared using hot press machine at different fiber loading (10, 20 and 30 wt%). Mechanical properties of such composites were investigated by tensile, flexural, impact and hardness tests. Generally, their mechanical properties showed a decreasing trend except impact strength that followed increasing trend. Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Thermo Gravimetric Analysis (TGA) were also carried out for the characterization of the composites. The FTIR analysis of the composites showed increase of fiber content. Tensile fracture surface morphology and thermal stability of the composites were examined by SEM and TGA analysis respectively.
The growing global environmental concern has increased the attention of world's scientific community towards natural fiber reinforced eco-composites. Hybridization of natural fiber with waste synthetic fiber improves the property of the composites as well as provides a better solution to waste management issues. Our Present research investigates the mechanical properties of layered areca and waste nylon fiber reinforced hybrid polypropylene (PP) composites. Composites were manufactured using hot press machine at a constant fiber loading of 10 wt% (areca: nylon=1:1), reinforcing the fibers into 2, 3 and 4 distinct layers. Tensile, flexure, hardness tests and Fourier transform infrared spectroscopic analysis were conducted for the characterization of the composites. Tensile test of composite showed an increasing trend of tensile strength and Young's modulus with increase in number of fiber layers. Similar trend was also observed in case of the flexural strength, flexural modulus and hardness values measurement. The surface morphologies of the tensile fracture surfaces of the composites were studied using scanning electron microscopy (SEM).The thermal stability of the composites were recorded using Thermo Gravimetric Analysis (TGA).
The effects of nickel additions on the change in microstructure of Zn-xNi lead free solder alloys were investigated. The investigation revealed that increasing Ni additions led to the increase in size of intermetallic Zn-Ni particles along with an increase in volume fraction of intermetallic particles. The microstructure also revealed the presence of the prominent delta (δ) phase in all three compositions of the solder alloy i.e. Zn-0.7 mass% Ni, Zn-1.0 mass% Ni and Zn-1.5 mass% Ni respectively. The presence of irregular shaped δ phase particles and conjoined δ phase particles were noticed in alloys with higher Ni content along with δ particles at grain boundaries. The most remarkable change occurred in the size of Zn grains, which decreased in size as Ni additions were increased. This reduction in size can be attributed to pinning effect of Zn grains by intermetallic particles.
The development of sophisticated material for application in dentistry has become a crying need at the present age. Although a significant numbers of materials including metals, ceramic, polymers, composites and now some nanocomposites exist for current and potential applications as dental implants, restoration and filling tooth roots, further rigorous research works are essential to make these promising materials commercially available as well as clinically feasible. However, mechanical properties, biological compatibility and antibacterial properties play vital role in determining the suitability of a particular material to be used. This review focuses on some newly developed potential dental materials in terms of their compatibility issues, sustainability in bacterial attack and mechanical characteristics. In addition, the limitation of the material and further research on it will also be discussed.