4. Chapter 1:Classification of Materials. A chemical reaction forming polymers from monomers is called polymerization, of which there are many types. Course Hero is not sponsored or endorsed by any college or university. %PDF-1.5 A polymer is analogous to a necklace made from many small beads (monomers). Get step-by-step explanations, verified by experts. Semi -synthetic polymers: 3. There are several ways of classification of polymers based on some special considerations. 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. 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. • Synthetic polymers are a mainstay of modern life, but nature also makes polymers; they are found in all living matter. The biggest advantage of conductive polymers is their processability, mainly by dispersion. 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). The thermoplastics can be divided into two types - those that are crystalline and those that are amorphous. Conveniently, all polymers can be assigned to one of two groups based upon their processing characteristics or the type of polymerization mechanism. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular structure. Classification of Polymers are given below-Classification of Polymers:-I. 8 Thus, the resulting fiberglass is relatively stiff, strong, (Figures 1.2 and 1.3) flexible, and ductile. Another of these technologically important materials is the “carbon fiber reinforced polymer” (or “CFRP”) composite—carbon fibers that are (i) Natural polymers The easiest way to classify polymers is their source of origin. This polymer can be cross-linked in the presence of KCl to form rigid gel beads [4]. (Monomers). 181 0 obj endobj There may. Examples are the epoxies and polyurethanes. 1. In cross-linked polymers, adjacent linear chains are joined to one another at various. 184 0 obj Based on Source. • Linear polymers have monomeric units joined end to end in single chains. Classification of Polymer Additives. endobj A common name for many synthetic polymer materials is plastic, which comes from the Greek word "plastikos", suitable for molding or shaping. POLYMERS 1. Naturally occurring polymers: These occur in plants and animals and are very essential for life. 1.1 Classification of Polymers. Ex: Starch, Polyvinyl chloride, Polyethylene, Nylon 6, 6 and etc. Thousands of different polymers have been synthesized and more will be produced in the future. 1. According to this classification polymers are of two types: Natural polymers; Synthetic polymers; Natural Polymers. Polyvinyl chloride (PVC) is a plastic polymer made of monomer vinyl chloride. Polymer classification on the basis of their structure - law On the basis of structure , polymers are divided into three types. 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. 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 … 1. Manufacturers place an SPI code, or number, on each plastic product, usually moulded into the bottom. endstream G . On the basis of source or origin, the polymers are classified into two types: Natural polymers and Synthetic polymers. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. << /Filter /FlateDecode /S 511 /Length 387 >> This guide provides a basic outline 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. endobj This preview shows page 1 - 2 out of 6 pages. x�cbd`�g`b``8 "Y�٦ �� The polymers obtained from nature are called natural polymers. Here the monomeric units are, distributed randomly, and sometimes unevenly, in the polymer. There may be extensive van der Waals and hydrogen bonding between the chains. This polyanion polymer contains a sulfate group (figure 2). Polypropene, also known as polypropylene, is made up of monomer propene. Conductive Polymers: Conductive polymers or, more precisely, intrinsically conducting polymers (ICPs) are organic polymers that conduct electricity. << /Linearized 1 /L 311408 /H [ 1258 468 ] /O 185 /E 113089 /N 41 /T 310050 >> Natural Polymersare those which are found in animals and plants. The urea-formaldehyde resin is a non-transparent plastic obtained by heating formaldehyde and urea. 2. 6. Classification of Polymers 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. Janhavi Shirish Zope M Pharmacy 1st year Department : Pharmaceutics R . Glyptal is made up of monomers ethylene glycol and phthalic acid. Classification of Polymers: 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. They are called plant and animal polymers. Based on Source: Under this type of classification, there are three subcategories. Classification based on source of availability. Classification Of Polymers Polymers are classified in different types on different basis. A common name for many synthetic polymer materials is plastic, which comes from the Greek word "plastikos", suitable for molding or shaping. be extensive van der Waals and hydrogen bonding between the chains. Examples: In branched polymers, side-branch chains are connected to main chains. 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. , natural rubber, classification of polymers pdf and nucleic acids etc classification, there many. 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