Polymers are high molecular weight compounds whose structures are made up of a large number of simple repeating units. The repeating units are usually obtained from low molecular weight simple compounds referred to as monomers.
The process by which monomers are converted into Polymers is called polymerisation.
Since the other answers dealt with the chemical part of it so I will talk about the other side of Polymers
Polymers play an important role in today's world. Actually we are surrounded by polymeric substance. From the pen we use to the American flag present on the surface of the moon( read Apollo mission success) all are made from Polymers.
But in spite of all these advantages Polymers also possesses adverse effects. Most of the Polymers are non-biodegradable substances and hence the use of Polymers has negative effects on the environmental. Huge amounts of plastic no biodegradable waste accumulates in the landfills which not only pollute the land but also brings various diseases to the dwellers nearby.
1. Plastic bearings such as are very popular for use on metal surface.
2. Plastics offer many advantages over other common bearing materials.
3. Plastics are extremely corrosive resistant and most are chemically resistant.
4. Plastic bearings do not transfer heat to other areas of the mechanical assembly.
5. Many plastics are even self-lubricating and therefore eliminate the possibility of failures from lack of maintenance.
Although many different types of plastics have properties which make them suitable for bearing applications, the most commonly used are phenolics, acetals, Teflon(PTFE), Ultra high Molecular Weight Polyethylene(UHMWPE), Nylon, Polyimide, Polysulphones, Polyphynlene Sulphides.
The igus® polymer bearing range offers a wide variety of engineering solutions. The polymer bearings offer far more than a simple plastic bearing. There are numerous specially engineered compounds used to adapt the polymer bearings to a diverse range of applications. The polymer compounds are a maintenance free solution as they require no lubrication. There are compounds for high loads, extreme temperatures, underwater use, low coefficients of friction, chemical resistance and long service life.
Example:
iglidur® plain bearings made of high performance polymers: application examples
Excellent polymers, improved through precise additions of reinforcements and solid lubricants, tested thousands of times and proved millions of times – that is iglidur.
Every year, igus engineers develop more than 100 new plastic compounds and conduct more than 3,500 tests on maintenance-free plain bearings, and over the years have established a large database of polymers' tribological specifications.
Whether packaging, textile industry, testing technology and quality assurance or model making: xiros plastic ball bearings are already used in a wide variety of areas. Due to the maintenance-free dry operation and the use of xirodur® high-performance polymers, various application problems can be successfully solved in areas where conventional ball-bearing solutions made of metal are unsuitable.
Applications it is used in Labelling machines
Self-lubricating plastic ball bearings are used in labelling machines and ensure smooth running.
Bike wash system
To mount the washing brushes, the manufacturer "cycleWash" has used two xiros slewing ring ball bearings.
Pool cleaner
Deep groove ball bearings from igus, give pool cleaners a steady and powerful underwater operation
Pellet stove
In the mechanical drive unit of a pellet stove, xiros ensures smooth running in the long-term.
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