Polyvinyl chloride is used in furniture and clothing and has recently become famous for the construction for doors and windows. The main parameter that can be used for this classification is the type of monomer used in the production of the polymer. Resins are any of the chemically modified natural resins or synthetic polymers which are physically similar, including thermoplastic materials such as polyvinyl, polystyrene, and polyethylene, as well as thermosetting materials such as polyesters, epoxies, and silicones. In fact, polymer molecules are often hundreds or thousands of monomer units long. Polymers can also make possible products that do not readily come from the natural world, such as clear sheets and flexible films. Shape memory polymer composites are high-performance composites, formulated using fibre or fabric reinforcement and shape memory polymer resin as the matrix. Polymers make up many of the materials in living organisms, and they constitute the basis of certain minerals and human-made materials, such as paper and plastics. This, unsurprisingly, is one of the biggest reasons why they’re so often used within the construction industry. Polystyrene is used in packaging. Polymers can be classified based on various parameters due to their complexity. Classification of polymers based on their structure can be of three types: (i) Linear polymers: 2] Classification Based on Structure of Polymers. They are used as stabilizers, pigments and other components to form plastics. Example: Vulcanized Rubber ( Sulphur is used in cross bonding the polymer chains found in natural rubber) Cellulose acetate (rayon) etc. In the following illustrated example, many monomers called styrene are polymerized into a long chain polymer called polystyrene. Starch is a natural polymer that is made up of hundreds of glucose molecules, similarly natural rubber is a polymer obtained from the latex of a rubber tree. Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular structure. Some examples are given as follows:-Poly β-hydroxybutyrate – co-β-hydroxy valerate (PHBV):- It is derived by combining 3-hydroxy butanoic acid and 3-hydroxy pentanoic acid, in which monomers are cross-linked by an ester linkage. Throughout the lesson students will apply taught knowledge to a worksheet which will form the basis of future revision. Polymers have many inherent properties that can be further enhanced by a wide range of additives to broaden their uses and applications. 0. the application of polymers and their subsequent composites is still advancing and increasing quickly due to their ease regarding manufacturing. Mechanical Recycling: In this process, the plastic is shredded and turned to granules before using it to make new items. book for details). Their thermal conductivities range from 0.1 to 0.3 W/m K. 54,55 By formulating resins with metal, metal oxide, or inorganic fillers, thermal conductivities can be increased 10-fold or better. Synthetic polymers include most of today's plastic materials that one can encounter in their day-to-day life such as plastics used in cars, mobile phones, electrical appliances, packaging material etc. In some industries, amino acids are used as additives as animal food. These include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. pure isotactic and syndiotactic polymers). For example, the demand for lightweight parts and vehicles using recycled materials challenges engineers to make "smart polymers" that change their properties according to their environments. 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