Another of these technologically important materials is the “carbon fiber reinforced polymer” (or “CFRP”) composite—carbon fibers that are Natural polymers are polymers which occur in nature and are existing in natural sources … << /Filter /FlateDecode /S 511 /Length 387 >> • The small building-block molecules are called monomers. network polymers. For example, starch, cellulose, natural rubber, proteins and nucleic acids etc. Examples are the rubber elastic materials. Classification of Polymers are given below-Classification of Polymers:-I. 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. Examples: In branched polymers, side-branch chains are connected to main chains. 1. Polymer additives can broadly be classified as polymer stabilizers or functional agents. DIFFERENT TYPES OF PLASTICS AND THEIR CLASSIFICATION The Society of the Plastics Industry (SPI) established a classification system in 1988 to allow consumers and recyclers to identify different types of plastic. Linear polymers have monomeric units joined end to end in single chains. The monomers in these are linked together to form a long chain. There are several ways of classification of polymers based on some special considerations. 5. 2. and mechanical properties of the polymer due to greater crystallinity. 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 … Copolymer - It is called when the polymer formed by at least 2 different monomers along the entire chain. Would you like to get the full Thesis from Shodh ganga along with citation details? << /Pages 261 0 R /Type /Catalog >> There may. Polystyrene is an aromatic polymer, naturally transparent, made up of monomer styrene. Classification: Conducting polymers may be classified as POLYMERS . 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. 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. According to this classification polymers are of two types: Natural polymers; Synthetic polymers; Natural Polymers. 1.1 Classification of Polymers. 1. They are called plant and animal polymers. 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. Get step-by-step explanations, verified by experts. This guide provides a basic outline Classification of Polymers: There are several ways of classification of polymers based on some special considerations. • Linear polymers have monomeric units joined end to end in single chains. a) Natural polymers - • Polymers either obtained from plants or animal are called natural polymers. Based on Structure/Shape of polymer Polymers can be linear, branched, cross linked or networked. Presented By , Miss. Classification of Polymers - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Polyethylene is considered to be as one of the simplest polymer, it has ethene or ethylene as the monomer unit whereas the linear polymer is known as the high density polyethylene-HDPE. Conductive Polymers: Conductive polymers or, more precisely, intrinsically conducting polymers (ICPs) are organic polymers that conduct electricity. 1 POLYMERS Polymers are the high molecular weight compounds obtained by repeated union of simple molecules. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! Polymer classification on the basis of their structure - law On the basis of structure , polymers are divided into three types. • Chemists also call them macro-molecules. Polymers: Lecture 2 Prepared by Dr Arunima Nayak and Dr Brij Bhushan Classification of Polymers 1. Synthetic polymers are those which are human-made polymers. These issues will be discussed at length in the next chapter. stream 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). Polypropene, also known as polypropylene, is made up of monomer propene. << /Linearized 1 /L 311408 /H [ 1258 468 ] /O 185 /E 113089 /N 41 /T 310050 >> This preview shows page 1 - 2 out of 6 pages. Network or cross linked polymers. endobj Classification of Polymers  Classification based on source:- • On the basis of sources of polymers they are classified in three types. Here the monomeric units are, distributed randomly, and sometimes unevenly, in the polymer. On the basis of source or origin, the polymers are classified into two types: Natural polymers and Synthetic polymers. In addition, it has a low density (Figure 1.1). What are Polymers and Classification of Polymers Notes pdf ppt. 3. Based on Source. A chemical reaction forming polymers from monomers is called polymerization, of which there are many types. positions by covalent bonding of atoms. �,�l`6�C���P�nA$�,��,� $����K@$o��"�"�j001� ���8JE �� b) Synthetic Polymers: The polymers which are prepared in the laboratories are called synthetic polymers E.g. The most common way of classifying polymers is to separate them into three groups - thermoplastics, thermosets, and elastomers. Classification of Polymer Additives. x�c```b``y�����V� � `6+���,� � ��������Ng�N0��`��x�� Examples: polyethylene, PVC, nylon. This polyanion polymer contains a sulfate group (figure 2). Natural polymers: These polymers are found in plants and animals. Cb����B�@$O�\��aƔ����_���0�f8ޠvt>���q=2 ��ٶ��4�%�b� �[�6��h>Ϫ5'V��꙽{���;�]븽{�E�U��O"ǝB�ٴ^���;,�t�:D��� ����ls�W�ʖ(��@D(���6�Q/�f��v�H����\��������hNZ~�xB���ZѪ�����RV��r �KY�K`��. Linear ploymers 2. Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular structure. A common name for many synthetic polymer materials is plastic, which comes from the Greek word "plastikos", suitable for molding or shaping. << /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>] >> Natural Polymersare those which are found in animals and plants. 1. A polymer is analogous to a necklace made from many small beads (monomers). 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 … 8 Thus, the resulting fiberglass is relatively stiff, strong, (Figures 1.2 and 1.3) flexible, and ductile. A chemical reaction forming polymers from monomers is called polymerization , of which there are many types. A polymer is analogous to a necklace made from many small beads (monomers). 184 0 obj Manufacturers place an SPI code, or number, on each plastic product, usually moulded into the bottom. The thermoplastics can be divided into two types - those that are crystalline and those that are amorphous. This includes cellulose, starch, proteins, resins etc. The term polymer is defined as very large molecules having high molecular mass. Small molecules that form 3 or more active covalent bonds create structures called. Glyptal is made up of monomers ethylene glycol and phthalic acid. The urea-formaldehyde resin is a non-transparent plastic obtained by heating formaldehyde and urea. Thousands of different polymers have been synthesized and more will be produced in the future. G . %���� ... Polymer classification on the basis of their source - diagram. Semi -synthetic polymers: 3. Polymers can be homopolymers when only one type of monomer is present (eg: polyethylene, polypropylene, polyvinyl chloride). The polymers obtained from nature are called natural polymers. 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. be extensive van der Waals and hydrogen bonding between the chains. Introducing Textbook Solutions. The word ‘ Polymer’ is coined from two Greek words: poly means many and mer means unit or part. Examples are proteins, cellulose, starch, resins and rubber. background, it will enable the engineer to design polymer components. 181 0 obj The biggest advantage of conductive polymers is their processability, mainly by dispersion. (Monomers). These polymers have high melting points and are of higher density. 1. SAPKAL COLLEGE OF PHARMACY 1 2. Poleythylene, polyvinylchloride (pvc), Nylon, Teflon, Backelite, Terylene etc. Polymers can be linear, branched, cross linked or networked. Classification based on source of availability. Intrinsically conducting polymers : These types of polymers have a solid backbone made up of extensive conjugated system, which is responsible for conductance. 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. (i) Natural polymers The easiest way to classify polymers is their source of origin. Download PDF for free. There may be extensive van der Waals and hydrogen bonding between the chains. POLYMERS 1. A common name for many synthetic polymer materials is plastic, which comes from the Greek word "plastikos", suitable for molding or shaping. Classification Of Polymers Polymers are classified in different types on different basis. 6. Home → 59.2 CLASSIFICATION OF POLYMERS Polymers are classified in a number of ways depending upon one criterion or the other as described below. Natural polymers These polymers are found in plants and animals. 1. In this chapter, focus will be on general characteristics, applications and an introduction to the mechanical behavior including elementary concepts of their inherent time dependent or viscoelastic nature. Naturally occurring polymers: These occur in plants and animals and are very essential for life. 182 0 obj •Polymersare the giant molecules of chemistry. • Synthetic polymers are a mainstay of modern life, but nature also makes polymers; they are found in all living matter. Based on Source: Under this type of classification, there are three subcategories. 4. 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. Polymers are those which consists of repeated structural units known as monomers. Branched polymers 3. The following are some of the common classifications of polymers: Under this type of classification, there are three sub categories. Conveniently, all polymers can be assigned to one of two groups based upon their processing characteristics or the type of polymerization mechanism. Janhavi Shirish Zope M Pharmacy 1st year Department : Pharmaceutics R . Ex: Starch, Polyvinyl chloride, Polyethylene, Nylon 6, 6 and etc. endstream The first classification of polymers is based on their source of origin, Let’s take a look. Course Hero is not sponsored or endorsed by any college or university. This polymer can be cross-linked in the presence of KCl to form rigid gel beads [4]. are common examples of natural polymers. 183 0 obj stream In cross-linked polymers, adjacent linear chains are joined to one another at various. 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. Examples are the epoxies and polyurethanes. 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. Polymer stabilizers are essential to practical use, since they maintain the inherent properties, color, and other characteristics of plastics by preventing the oxidative degradation caused by high temperature during processing, and ultraviolet exposure during use. They may be of two types: CONTENTS Introduction Types of Polymer Classification of Polymer Characteristics of Polymer Application References 2 3. Synthetic polymers: endobj These include starch cellulose, proteins, nucleic ... 2. Such compounds may have metallic conductivity or can be semiconductors. endobj %PDF-1.5 Polyvinyl chloride (PVC) is a plastic polymer made of monomer vinyl chloride. Chapter 1:Classification of Materials. x�cbd`�g`b``8 "Y�٦ �� Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. This video explains the definition and classification of Polymers with the help of a live example. 1. 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