Structure and Properties of Styrene butadiene rubber
While most of the properties of SBR are comparable with NR, but in some respects like heat build-up, tack and gum tensile strength make it inferior to natural rubber. Other disadvantages include: Low elongation at break Low hot tear strength Hysteresis, resilience But the addition of resins and reinforcing fillers adequately improve these properties. However, there are properties which makes it superior over natural rubber. These include: Better process ability, Slightly Better heat aging Better abrasion resistance and resistance to degradation (under heat) Also, scorch problems are less likely to occur with SBR than with NR. Overall, the most important factors in the commercial viability of SBR making it material of choice over other rubbers are: Wide availability Low cost compared with those of all other synthetic rubbers, Ability to accept high filler levels, Relatively stable price compared with that of NR and Overall properties on a cost/performance basis Rubber…
Whatever we should know about low density polyethylene?
Low-density polyethylene – LDPE is terminologically composed of two terms monomer meaning single part and ethylene which is a hydrocarbon with the formula C 2 H 4. Lightweight polyethylene was produced in 1933 under very high pressure and along with the radical release of polymerization by the British company ICT. Also, the rate of degradability of this material in nature according to the EPA or environmental protection test is equal to 5.7%, which is determined by the degradability number 4. Despite the fact that many polymer products have been produced and industrialized in global markets, today LDPE is considered as one of the most important products in the plastic industry, so that in 2013, the revenue of this product in the markets around the world was about $ 33 billion. it is arrived . Properties of lightweight polyethylene – LDPE LDPE densities range from 0.91 to 0.940 g / m3.…
Physical and chemical properties of SLS
The critical micelle concentration (CMC) of sodium lauryl sulfate in pure water at 25 ° C is 8.2 mm and the accumulation number at this concentration is usually about 62.The percentage of micelle ionization (α) is about 0.3 (or 30%). It is used in a wide range of concentrations. According to a 2015 study, 0.01% to 50% is used in cosmetics and 1% to 30% in cleaning products. Applications – SLS SLS has many applications, mainly in various detergents. It is a very effective surfactant and is used in any work that requires the removal of greasy and stabilized stains; For instant it is found in high concentrations in industrial products, including car engine cleaners, car floor cleaners, and car wash soaps. At lower concentrations, it is used in toothpaste, shampoo, beard paste. The reason for its use in these fields is its ability to create foam, its surfactant properties…