They are biodegradable and have a very well defined structure. Low-density polyethene (LDPE) used in  plastic bags and general purpose containers is a common example. Polymers are made out of small units known as monomers. They include carbohydrates and proteins, which provide structural support to plants and animals. In this type of polymers,  monomers are linked together to form a three-dimensional network. They do not contain any cross bond and can easily be shaped by heating and using moulds. The polymer is formed by polymerization of monomers with double or triple bonds (unsaturated compounds). It also discusses some of the most widely used natural polymers in industries. Polymerization is the process by which monomer molecules are reacted together in a chemical reaction to form a polymer chain (or three-dimensional networks). Natural polymers are found in nature and are generally obtained from animal and plants. 8 Thus, the resulting fiberglass is relatively stiff, strong, (Figures 1.2 and 1.3) flexible, and ductile. Addition polymers always have their empirical formulas same as their monomers. Enzymes are bio catalysts which are proteins and thus, these are also polymers. pp 1-17 | Natural rubber latex is a polymer that a tree exudes following injury. Synthetic polymers are polymer compounds that are produced artificially. Join courses with the best schedule and enjoy fun and interactive classes. Princeton University Press, Princeton, New Jersey, Willstatter R, Zechmeister L (1913) Zur Kenntnis der Hydrolyse Stoffe im Sinne der Kekuleschen Strukturlehre. E.g. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Based on their structure, the polymers can be classified into three types such as linear polymers, branched-chain polymers, and network, or cross linked polymers. By Mode Of Formation 5. 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. Plant Cell Environ 7:16–153, Kaewkorn WL (2013) Effect of silk sericin on the proliferation and apoptosis of colon cancer cells. By Structure 6.  Classification based on source:- • On the basis of sources of polymers they are classified in three types. By Origin Natural Polymers Polymers which are isolated from natural materials are called as natural polymers… Traditionally the three major classes of materials are metals, polymers, and ceramics. A chemical reaction forming polymers from monomers is called polymerization , of which there are many types. Examples are proteins, cellulose, starch, resins and rubber. Learn different types of Polymerization here. These include starch cellulose, proteins, nucleic acids and natural rubber. Int J Drug Deli Res 3(2):85–103, Sjöström E (1993) Wood chemistry: fundamentals and application. Examples are proteins, cellulose, starch, resins. The molecular structure of cotton cellulose. 1. Since Polymers are numerous in number with different behaviours and can be naturally found or synthetically created, they can be classified in various ways. Agri Food Sci Finland 9:23–35, Tanada-Palmu SP (2003) Development and characterization of edible films based on gluten from semi-hard and soft Brazilian wheat flours: development of films based on gluten from wheat flours. 1. The basic classification of polymers includes two groups known as natural polymers and synthetic polymers. These macromolecules are classified according to structures, chemical, and physical properties. There are two types of average molecular masses of polymers, i.e. These polymers are brittle and hard. Int J Res Pharm Biomed Sci 3:1604–155597, Waga J (2004) Structure and allergenicity of wheat gluten proteins—a review. The monomers contain strong covalent bonds as they are composed of bi-functional and tri-functional in nature. Natural polymers are polymer compounds that can be found in our environment. Natural polymers have been widely used in a variety of biomedical applications such as pharmaceuticals, tissue regeneration scaffolds, drug delivery agents, and imaging agents. The monomers in these are linked together to form a long chain. Adv Plant Biochem Mol Biol 1:201–239, Oerther S, Payan E, Lapicque F, Presle N, Hubert PM, Netter P et al (1999) Hyaluronate–alginate combination for the preparation of new biomaterials: investigation of the behaviour in aqueous solutions. 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