Material Polymers
A Polymer is a huge molecule also known as macromolecule composed of replicating structural units linked by chemical bonds of covalent. Polymer materials can be organic or inorganic and natural or synthetic in origin. Polymers are important materials for roughly every industry in the form of paper, fibers, cloths, building materials, adhesives, ceramics, plastics, liquid crystals, coatings, concretes and photo resists. They are significant in engineering, medicine, biology, nutrition, space exploration, environment and health.
Natural inorganic polymers comprise of diamonds, sand, agates, feldspars, graphite, agates, quartz, mica, and talc. Natural organic polymers comprise of poly carbohydrates such as cellulose and starch, proteins and nucleic acids. Synthetic inorganic polymers comprise of boron nitride, high temperature superconductors, glasses and concrete. Synthetic polymers utilized for structural constituents weigh up significantly less than metals, assisting to decrease the utilization of fuel in aircraft and vehicles. They also outperform nearly all metals when considered on the basis of strength per weight. Polymers can also be used for purposes of engineering such as bearings and gears.
Fibers are one of the polymer materials which are sturdy in one direction and they are too longer. Cotton, silk, and wool are fibers natural in nature which are utilized by humans since many years. Nylon, rayon, acrylic and polyester are the man-made fibers. The amalgamations of weight, durability and strength have prepared these materials as essential in modern industry.
Nylon is also polymers that have some unique properties which makes it different from other materials. Elasticity is the main property of nylon. Nylons are extremely elastic but when the limits of elastics are over stretched the material do not return in its original shape. Similar to synthetic fibers, nylon has a huge electrical resistance. Elastomers are also considered as polymeric materials which can be distorted by way of applying force, and after removal of force, the materials gets back to its original shape. Materials of plastic have properties linking elastomers and fibers which are flexible and hard. Adhesives and coatings are usually originated from polymers and are the members of different groupings. Industrially essential coatings and adhesives comprise of sealants and caulks, laminates, liquid crystals, cement and ceramic.
Processed materials of polymer are usually a mixture of the materials and the polymer for modifying its properties, helpful in processing and initiating new properties. Additives can be liquids, gases or solids. Classic additives are antioxidants, fillers, plasticizers, reinforcements and colorants. Numerous polymers are thermoplastics and they can be reformed and used by way of pressure and heat in the manufacture of further thermoplastic materials. It is really difficult to recycle thermo-sets polymers as they do not melt but prior to softening they get degraded.
Composite material is a material system composed of combination or mixture of more than two constituents that vary in material composition or form and are significantly mysterious in each other. In law, composites can be created by mixture of more than two materials- organic, inorganic or metallic but the elements are more controlled. Main structural elements are particles, fibers, layers, fillers, matrices and flakes. Advanced composites include structural materials developed for applications of high-technology such as structures of air frame, in favor of which further materials are not adequately stiff. In these materials, very strong and stiff continuous or discontinuous whiskers, fibers or miniature particles are isolated in the matrix. Nowadays, the utilization of fiber resistant materials has grown rapidly in applications of engineering. Choice of composites as compared to monolithic materials is stated by the selection of properties.
Thus, nowadays wide range of polymer materials are available with their distinct properties and are useful in several ways in different fields.
This entry was posted on Thursday, July 24th, 2008 at 12:28 pm and is filed under Polymers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.