Would you like to get the full Thesis from Shodh ganga along with citation details? The following are some of the common classifications of polymers: Under this type of classification, there are three sub categories. Intrinsically conducting polymers : These types of polymers have a solid backbone made up of extensive conjugated system, which is responsible for conductance. Presented By , Miss. �,�l`6�C���P�nA$�,��,� $����K@$o��"�"�j001� ���8JE �� They are called plant and animal polymers. 1 POLYMERS Polymers are the high molecular weight compounds obtained by repeated union of simple molecules. Polymers-Lecture 2.pdf - Polymers Lecture 2 Unit-2a Classification of Polymers 1 Based on Structure\/Shape of polymer Polymers can be linear branched, Prepared by Dr Arunima Nayak and Dr Brij Bhushan. Classification based on source:- • On the basis of sources of polymers they are classified in three types. 6. Polypropene, also known as polypropylene, is made up of monomer propene. Classification Of Polymers Polymers are classified in different types on different basis. 4. In addition, it has a low density (Figure 1.1). and mechanical properties of the polymer due to greater crystallinity. Conductive Polymers: Conductive polymers or, more precisely, intrinsically conducting polymers (ICPs) are organic polymers that conduct electricity. Poleythylene, polyvinylchloride (pvc), Nylon, Teflon, Backelite, Terylene etc. A chemical reaction forming polymers from monomers is called polymerization , of which there are many types. The word ‘ Polymer’ is coined from two Greek words: poly means many and mer means unit or part. Natural polymers: These polymers are found in plants and animals. Thousands of different polymers have been synthesized and more will be produced in the future. For example, starch, cellulose, natural rubber, proteins and nucleic acids etc. 8 Thus, the resulting fiberglass is relatively stiff, strong, (Figures 1.2 and 1.3) flexible, and ductile. endobj 1. 3. Polymers are those which consists of repeated structural units known as monomers. SAPKAL COLLEGE OF PHARMACY 1 2. Semi -synthetic polymers: 3. According to this classification polymers are of two types: Natural polymers; Synthetic polymers; Natural Polymers. Classification of Polymers - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. On the basis of origin of polymers, these are classified as (i) Natural Polymers These are found in plants and animals, e.g., cellulose, starch (polymer of glucose), protein (polymer of α-amino acids), rubber (polymer of isoprene, 2-methyl-1, 3-butadiene). These include starch cellulose, proteins, nucleic ... 2. A polymer is analogous to a necklace made from many small beads (monomers). %PDF-1.5 Such compounds may have metallic conductivity or can be semiconductors. Naturally occurring polymers: These occur in plants and animals and are very essential for life. Branched polymers 3. Glyptal is made up of monomers ethylene glycol and phthalic acid. 5. POLYMERS 1. Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular structure. %���� Natural Polymersare those which are found in animals and plants. endobj Here the monomeric units are, distributed randomly, and sometimes unevenly, in the polymer. Get step-by-step explanations, verified by experts. Linear ploymers 2. 5.33, Introduction to Polymer Chemistry Page 4 Classification of polymers: Polymers (synthetic) 1) Thermoplastics (plastics) — linear, some cross -linking can be melted and reformed on heating a) Amorphous — no ordered structure b) Semi -crystalline — compo sed of microscopic crystallites — domains of crystalline structure. G . The monomers in these are linked together to form a long chain. Polymer classification on the basis of their structure - law On the basis of structure , polymers are divided into three types. •Polymersare the giant molecules of chemistry. 1. b) Synthetic Polymers: The polymers which are prepared in the laboratories are called synthetic polymers E.g. 184 0 obj Polyvinyl chloride (PVC) is a plastic polymer made of monomer vinyl chloride. 181 0 obj There are several ways of classification of polymers based on some special considerations. a) Natural polymers - • Polymers either obtained from plants or animal are called natural polymers. Materials Science of Polymers for Engineers is based on the German textbook, Werk stoffkunde Kunststoffe (G. Menges, Hanser Publishers, 1989), and on lecture notes from polymer materials … The number of monomeric units usually is large and variable, each sample of a given polymer being characteristically a mixture of molecules with different molecular weights. 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. (Monomers). Synthetic polymers are those which are human-made polymers. Examples are the rubber elastic materials. This polyanion polymer contains a sulfate group (figure 2). A chemical reaction forming polymers from monomers is called polymerization, of which there are many types. POLYMERS olymers are substances made up of recurring structural units, each of which can be regarded as derived from a specific compound called a moanomer. Examples: In branched polymers, side-branch chains are connected to main chains. Synthetic polymers: Examples are proteins, cellulose, starch, resins and rubber. Network or cross linked polymers. 1. The term polymer is defined as very large molecules having high molecular mass. Ex: Starch, Polyvinyl chloride, Polyethylene, Nylon 6, 6 and etc. << /Type /XRef /Length 94 /Filter /FlateDecode /DecodeParms << /Columns 5 /Predictor 12 >> /W [ 1 3 1 ] /Index [ 181 95 ] /Info 201 0 R /Root 183 0 R /Size 276 /Prev 310051 /ID [<567f1b62382ae6ca8887dca1d9640ed5><567f1b62382ae6ca8887dca1d9640ed5>] >> 2. A common name for many synthetic polymer materials is plastic, which comes from the Greek word "plastikos", suitable for molding or shaping. (i) Natural polymers The easiest way to classify polymers is their source of origin. Based on Source. In cross-linked polymers, adjacent linear chains are joined to one another at various. This polymer can be cross-linked in the presence of KCl to form rigid gel beads . background, it will enable the engineer to design polymer components. 2) Based on the structure polymers are classified as (a) linear polymer (b) Branched chain polymer (c) crosslinked polymer a) Linear polymer : In linear polymer the monomeric units are linked together to form linear … << /Filter /FlateDecode /S 511 /Length 387 >> << /Pages 261 0 R /Type /Catalog >> Polystyrene is an aromatic polymer, naturally transparent, made up of monomer styrene. These issues will be discussed at length in the next chapter. Natural polymers are polymers which occur in nature and are existing in natural sources … x�cbd`�g`b``8 "Y�٦ �� 183 0 obj Depending on the repetition or variety of monomers, polymers are classified as: Homopolymer - It is called when the polymer formed by the same monomer throughout its chain. Based on Source: Under this type of classification, there are three subcategories. • Synthetic polymers are a mainstay of modern life, but nature also makes polymers; they are found in all living matter. Classification of polymers based on their structure can be of three types: (i) Linear polymers: These polymers are similar in structure to a long straight chain which identical links connected to each other. positions by covalent bonding of atoms. Copolymer - It is called when the polymer formed by at least 2 different monomers along the entire chain. Polymers can be co-polymer when two or more types of monomeric units are present, – only one monomer (repeating unit): - A – A – A – A – A – A – A -, Also called random copolymers. Classification: Conducting polymers may be classified as POLYMERS . network polymers. Based on Structure/Shape of polymer Polymers can be linear, branched, cross linked or networked. The first classification of polymers is based on their source of origin, Let’s take a look. This includes cellulose, starch, proteins, resins etc. • Chemists also call them macro-molecules. The polymers obtained from nature are called natural polymers. << /Linearized 1 /L 311408 /H [ 1258 468 ] /O 185 /E 113089 /N 41 /T 310050 >> Polymers can be homopolymers when only one type of monomer is present (eg: polyethylene, polypropylene, polyvinyl chloride). HDPE – high, density polyethylene is primarily a linear polymer with minor branching, while LDPE, linearity and chain length tend to increase the melting point and improve the physical. Cb����B�@$O�\��aƔ����_���0�f8ޠvt>���q=2 ��ٶ��4�%�b�
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