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classification of polymers ppt

CHE407B (1).pdf. Classification of Polymers based upon Sources : Depending on the source the polymers are classified into two classes : Natural Polymers. Regarding the physical shape, they can be classified as free linear chain solutions, reversible gels covalently cross linked and polymer chain grafted on a surface [15]. Classification of Polymers. These polymers have a similar structure to the polyamides, which have the urethane (carbamate) group as part of the polymer backbone. This document is highly rated by students and has been viewed 474 times. i.e., in plants or animals. 2. Addition polymers such as polyethylene, polypropylene, poly(vinyl chloride), and polystyrene are linear or branched polymers with little or no cross-linking. Semi-synthetic polymers: Cellulose derivatives as cellulose acetate (rayon) and cellulose nitrate, etc. The polymers are recyclable in nature. 8 Thus, the resulting fiberglass is relatively stiff, strong, (Figures 1.2 and 1.3) flexible, and ductile. The most common way of classifying polymers is to separate them into three groups - thermoplastics, thermosets, and elastomers. (ii) Synthetic polymers The polymers which are prepared in the laboratory are known as synthetic polymers or man-made polymers, e.g., polythene, synthetic rubber, PVC, nylon-66, This video explains the definition and classification of Polymers with the help of a live example. As a result, they are thermoplastic materials, which flow easily when heated and can be molded into a variety of shapes. Download now. The Polymers: Classification The main classes of polymers are: • Natural polymers Example: cellulose and protein, which provide the mechanical basis for most plant and animal life • Thermoplastics, which soften on heating Example: polyethylene • Thermosets or Resins, which harden when two components are heated together Example: an epoxy The polymers are defined as macromolecules composed of one or more chemical units (monomers) that are repeated throughout a chain.. A polymer is like a thread joins many coins punched through the center, in the end we get a string of coins, the coins would be the monomers, and the chain with the coins would be the polymer. POLYMERS.ppt. N. Hamadneh2, Waqar A. Khan*1 1Department of Mechanical & Industrial Engineering, College of Engineering Majmaah University, P.O Box 66, Majmaah 11952, Kingdom of Saudi Arabia. Polymers can be classified as plastics (resins), elastomers (rubber) and fibres (nylon, terylene) The properties of polymer depend on their molecular configuration, the degree of polymerization, branching and cross linking. Topological polymers may refer to a polymeric molecule that possesses unique spatial features, such as linear, branched, or cyclic architectures. On the basis of source or origin, the polymers are classified into two types: Natural polymers and Synthetic polymers. II.E Polymer-Polymer Interactions. The objective of this chapter is to classification of biodegradable polymers. S. Khan1, Nawaf. Polymer nanocomposites – synthesis techniques, classification and properties Waseem. 2. Jump to Page . Polyethylene. Would you like to get the full Thesis from Shodh ganga along with citation details? The sulphur is present due to the amino acid cysteine By way of example, consider a polymer such as polyethene which, in a normal commercial sample, will be made up of molecules having 1000 to 2000 CH, groups in continuous chains. Classification of Polymers Based on Source of Origin (i) Natural polymers Those polymers which occur in nature. Types of Plastics: They are two types of Plastics: of Chemistry. CLASSIFICATION POLYMERS OF GENERAL USE (Commodity) Polymers of high consumption: polyolefins, polyacrylates and methacrylates, polystyrene, PVC, resins ,phenols, urea and melamines, polyesters, polyurethanes, epoxy resins and diverse elastomers TECHNICAL AND ENGINEERING POLYMERS Classification of Polymers Polymers are classified based on the reaction by which they are formed. Mats. 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. Polymer Physics Overview Lecture Notes 1 Lecture 1 Dr. Anthony Brennan University of Florida Department of Materials Science & Engineering EMA 6165 Polymer Physics – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 46d2eb-MzA2N Close suggestions. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. are the usual examples of this subcategory. Synthetic polymers: A variety of synthetic polymers as plastic (polythene), synthetic fibres (nylon 6,6) and … For example, polyhydroxyalkanoate from corn grain (PHA-G) ranked very high in the Green Design ranking, but had […] 1. CSS Solved EDS Past Papers - 1994 to 2013_djvu. 3 OVERVIEW • Role of resins in FRP composites • Thermosets vs. thermoplastics – Advantage & limitations • Polymer chemistry – Chain & step polymerization • Catalysts, inhibitors, accelerators – Chain crosslinking/ curing – Typical thermoset resin systems • Polymer processing • Polymer physics – Glass transition – Stress-strain curve • Summary Natural polymers: These polymers are found in plants and animals.Examples are proteins, cellulose, starch, resins and rubber. There are other polymers that have a id era ng of u s, p tc l y engineering sectors. Isotactic and syndiotactic polymers are instances of the more general class of eutactic polymers, which also includes heterogeneous macromolecules in which the sequence consists of substituents of different kinds (for example, the side-chains in proteins and the bases in nucleic acids). We highlighted that LCA ranking and Green Design rankings do not necessarily correlate exactly. 1. Linear copolymers can be further classified into several categories such as Chapter 1:Classification of Materials. The chemical structure, sources, production and synthesis methods, physical properties (mechanical, barrier and thermal properties) and applications of most important biodegradable polymers would be discussed. Now, let’s discuss the Classification or Types of Plastics. Polymers that are not highly cross-linked have properties that depend greatly on the forces that act between the chains. lesson 1 fibres: their classification and characteristics structure 1.0 objectives 1.1 introduction 1.2 classification of fibres 1.3 natural fibres 1.4 polymeric natural fibres 1.5 man-made fibres 1.6 natural fibres vs.man-made fibres 1.7 assignments 1.7.1 class assignments 1.7.2 home assignments 1.8 summing up 1.9 possible answers to self-check questions Polymer Processing Thermoplastics start as regular pellets or granules and can be remelted. E.Ann MacGregor, in Encyclopedia of Physical Science and Technology (Third Edition), 2003. These are the 11 properties of polymers or plastics which are discussed in a detailed manner. Sep 13, 2020 - Chapter 15 - Polymers - PPT, The Science and Engineering of Materials Notes | EduRev is made by best teachers of . from plants and animals are called Natural Polymers. Easily when heated and can be classified according to their physical features or to the polyamides, have... Large molecules that are crystalline and those that are not highly cross-linked have properties that depend greatly on basis! Are found in plants and animals from METE 230 at Middle East Technical University Merkez... Composites CERAMICS polymers classification natural polymers and their applications of synthetic polymers - Merkez.. A live example, the polymers are classified in a number of ways depending upon criterion! Semi-Synthetic polymers: the polymers are classified based on the basis of source origin. 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