Cost The cost of this additive is not that high and it can easily be put inside in the polymer when the product is being made. Stiffness In terms of stiffness this additive is hard and stiff. This affects the polymers in a good way because it acts like a protective shield for the polymer to stop any polymer oxidation on the polymer. Service life The service life of the antioxidants is long but not that long. This is because if the additive starts to weaken due to the harmful polymer oxidation chemicals in the air then this could make the polymer properties to become brittle.
While most of the polyurethanes are thermosetting polymers that don't melt when heated, thermoplastic polyurethanes are also available. PU polymers are traditionally and generally formed by reacting di- or polyisocyanate with an apolyol. Both the iso-cyanates and polyols used to make polyurethanes have on average two or more than two functional groups per molecule. Some notable recent efforts have been dedicated to minimize the use of iso-cyanates to synthesize polyurethanes, because the iso-cyanates elevate severe toxicity issues. Non-iso-cyanate based polyurethanes (NIPUs) have just been developed as a new class of polyurethane polymers to alleviate health plus environmental concerns.
Plastics are primarily made from petrochemicals. They are generally organic polymers of high molecular weight. The vast majority of these polymers are based on chains of carbon atoms or with oxygen, sulphur, or nitrogen as well. The backbone is that part of the chain on the main "path" linking a large number of repeat units together. To customize the properties of a plastic, different molecular groups "hang" from the backbone (usually they are "hung" as part of the monomers before the monomers are linked together to form the polymer chain).
STRUCTURE Kevlar Aramid Fiber is a synthetic (man-made) material known as a Polymer. A polymer is a chain that is made up of many similar molecular groups, better known as ‘monomers’ that are bonded together. ‘Monomers’ are made up of fourteen Carbon atoms, two Nitrogen atoms, two Oxygen atoms and ten Hydrogen atoms. A single Kevlar polymer chain could possibly have anywhere from one to five million monomers bonded together. A group of polymer chains can be organised together in a fiber.
The property of polymers are easy processing as majority are thermoplastics, meaning that they can be softened by heat and hardened by cooling in a reversible physical process. Another useful property of polymer is that they are unreactive, meaning that they are suitable for storing food and chemical safely. However, this property
A fuel cell is mainly used to provide electricity from chemical reactions. It harnesses the chemical energy of hydrogen and oxygen to generate electricity without combustion one of the basic types of fuel cells is the Polymer Electrolyte Membrane Fuel Cell (PEMFC). This section will give a general description of its parts, how do they function and the material they are consisted of. 3.2 Background Polymer electrolyte membrane fuel cells operate at relatively low temperatures, around 80°C (176°F). Low-temperature operation allows them to start fast (less warm-up time) and results in less wear on system components, which result in better durability.
Polypropylene is one of those most versatile polymers available with applications, both as a plastic and as a fiber, in virtually all of the plastics end-use markets.  Production of polypropylene takes place by slurry, solution or gas phase process, in which the propylene monomer is subjected to heat and pressure in the presence of a catalyst system. Polymerization is achieved at relatively low temperature and pressure and the product yielded is translucent, but readily colored. Differences in catalyst and production conditions can be used to alter the properties of the plastic. Propylene is obtained, along with ethylene, by cracking naphtha (crude oil light distillate).
Polymers are large molecules composed of smaller molecules called monomers. Monomers are produced and either grow together or are assembled to produce a single polymer. There are synthetic and natural polymers. Some examples of natural polymers would be wood, starches, fingernails, and hair. Synthetic polymers are usually referred to as plastics.
Carbohydrates, lipids proteins, and nucleic acids are the four major classes of organic compounds in cells. Some of these compounds are very large and are called macromolecules. Most macromolecules are polymers, chains of identical or similar building blocks called monomers. Monomers form larger molecules by condensation reactions in which water molecules are released, dehydration. Polymers can disassemble by the reverse process, hydrolysis.
POM is very stiff, rigid, durable plastic that is used in many machine parts as well as fuel tanks in cars and any application that requires the use of a hard durable plastic. It is used as a substitute for metal in some cases saving time and energy as the plastic is easily replaceable and cheap to make. POM is a vital copolymer used for parts that require precision and is manufactured by many companies as the go to standard for a hard plastic material. However, POMs homopolymer counterpart is a viable alternative to the copolymer variety of