1. 0000008022 00000 n 75 • Break down cellular membrane and • Release biologically active compound. - Polymers have good mold-ability, and excellent surface finish - They have good corrosion resistance. 3 Characteristics of polymers (plastics) 1. Properties The polymers are not soluble due to their crosslinked nature and high molecular weight. Flow properties of molten polymers are important since processing of thermoplastics involves flow of the polymer melt. Electronic conduction in polymers 5. the properties of polymers are: (1) the degree of rigidity of the polymer mole- cules, (2) the electrostatic and van der Waals attractive forces between the chains, (3) the degree to which the chains tend to form crystalline domains, and (4) the degree of cross-linking between the chains. Equivalent Weight 76 ± 4 Dissociation Constant pKa = 6.0 ± 0.5 Ionic conduction, particulate and molecular composites 9. Processing of polymers. Processing of polymers. - Polymers of different colors can be produced. Alteration in polymer properties can be used to: • Adhere to the cell surface . The 0 WHAT IS AEROSPACE Aerospace sector was launched on Dec, 1903. 1 INDEX 1. A macromolecule composed of repeated subunits forms a polymer. Dielectric breakdown 7. Synthesis of Polymers The mechanism of synthesis of natural polymers in living organisms, the biosynthesis, is extremely complex and is one of the most important topics in biochemistry. Chapter 5 Polymer properties and applications Mechanical characteristics of polymers Stress-strain behavior Deformation of polymers Factors that influence the mechanical properties of polymers Polymer applications Mechanical characteristics of polymers Polymers • … A primary reason that polymer properties are different is because the chemical compositions of metals, polymers and ceramics are totally different. Click Get Books and find your favorite books in the online library. vu�f`_�f�j…}�i|�? A polymer is a high molecular mass compound ranging from 5000 to one million and they are formed by the combination of a large number of one or more low molecular weight compounds. Organic materials 2. Polymer crystals 7. PDF | physical properties of polymers | Find, read and cite all the research you need on ResearchGate endstream endobj 163 0 obj <> endobj 164 0 obj <> endobj 165 0 obj <>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 166 0 obj <> endobj 167 0 obj <> endobj 168 0 obj [/ICCBased 176 0 R] endobj 169 0 obj <> endobj 170 0 obj <> endobj 171 0 obj <> endobj 172 0 obj <>stream References 12. Index. Polymers are composed of non-metallic elements, found at the upper right corner of the periodic table. Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Properties The polymers are not soluble due to their crosslinked nature and high molecular weight. 0000000016 00000 n They consist of long, discrete molecules that meltto a viscous liquid at the processing temperature, typically 500” to 700” F (260° to 3710 C), and, after forming, are cooled to an amorphous, semicrystalline, or crystalline solid. Dielectrics in static fields 3. Unlike the cur- View CHARACTERISTICS OF POLYMERS USED-converted.pdf from METALLURGY 308 at NED University of Engineering & Technology, Karachi. Characteristics of Condensation Polymers Condensation polymers form more slowly than addition polymers, often requiring heat, and they are generally lower in molecular weight. PDF | On Oct 1, 2004, Walter Richtering published Physical Properties of Polymers | Find, read and cite all the research you need on ResearchGate 2 Periodic table with the elements associated with commercial polymers in color. x�b```"E�Ad`e`�s|RP�RbPRbRbb��*v0���7|4��� 1. ………………………………………………………………… …………………………………………………6, ……………………………………………………………………………….7, ……………………………………………..7, ………………………………………………………………………………………….8, Aerospace industry is the most powerful industry and biggest, industry in united states.industry involves in the, production of military, aircraft,missiles, space commercial airliners,etc.The US, sector becawse it involves in the production of primary products,flight vehicles,in which million of parts is required.the. NED University of Engineering & Technology, Karachi, NED University of Engineering & Technology, Karachi • METALLURGY 1003, NED University of Engineering & Technology, Karachi • METALLURGY my-304, Characterizaition of properties of epoxy hybrid composites.pdf, Indian Institute of Technology, Kharagpur, Krishan-K.-Chawla-auth.-Composite-Materials_-Science-and-Engineering-Springer-Verlag-New-York-2012.p, 1659385320000_Vacuum Teaching Course - I.pdf, Ceramic_Coatings_-_Applications_in_Engineering.pdf, Material and Process Design for Lightweight Structures by Talal Al-Samman (z-lib.org).pdf, Indian Institute of Technology, Kharagpur • METALLURGY 102, Mit College Of Engineering Pune • METALLURGY 101, University of Johannesburg • ENGINEERIN METALLURGY. Electronic conduction in polymers 5. 2. Topic: Principle Characteristics of Polymers A primary reason that polymer properties are different is because the chemical compositions of metals, polymers and ceramics are totally different. 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. PDF | physical properties of polymers | Find, read and cite all the research you need on ResearchGate PHYSICAL PROPERTIES OF POLYMERS The structure of polymers is hierarchical, and both the monomer organization and larger-scale structure affect the observable properties, such as phase transitions, strength, solubility, and elasticity. 162 0 obj <> endobj PDF | On Oct 1, 2004, Walter Richtering published Physical Properties of Polymers | Find, read and cite all the research you need on ResearchGate MSE 2090: Introduction to Materials Science Chapter 15, Processing of Polymers 4 ¾Mechanical properties of polymers change dramatically with temperature, going from glass-like brittle behavior at low temperatures to a rubber-like behavior at high temperatures. Create free account to … Some of the useful properties of various engineering polymers are high strength or modulus to weight ratios (light weight but comparatively stiff and strong), toughness, resilience, resistance to corrosion, lack of conductivity (heat and electrical), color, transparency, processing, and low cost. An amorphous polymer means a non-crystalline material. %%EOF function affects significantly many properties of polymers and is one of their important characteristics. characteristics, but also affects the properties of the cured system, although the mechanical properties of a FRP composite are mainly dependent on the type, amount, and orientation of fiber. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! Course Hero is not sponsored or endorsed by any college or university. The terminal functional groups on a chain remain active, so that groups of shorter chains combine into longer chains in the late stages of polymerization. Introduction 2. 3 Characteristics of polymers (plastics) 1. large molecule or a macromolecule which essentially is a combination of many subunits • Thermosetting polymers become permanently hard at elevated temperatures and pressures. ¾Polymers are also very sensitive to the rate of deformation (strain rate). �[��� �g@���ℑ���$��E��/*{y Applications of electro-active and conductive polymers 11. 5Topic:Principle Characteristics of Polymers Polymers are giant molecules. 0000075564 00000 n To produce polymer concrete, furan resin, sulfuric acid or orthophosphoric acid as hardener and catalyst and Tri-chloro toluene as curing They are important chemicals in our bodies (proteins, poly(nucleic acids)), in plants (starch, cellulose), and in our everyday lives (fibers, plastics, elastomers). 182 0 obj <>stream Index. Measurement of electrical properties 6. 37 Physical Properties Of Polymers • A thermoplastic polymer is one that can be softened by heating and then formed into desired shapes by applying pressure. Some of these are xref 0000001374 00000 n A chemical compound or mixture of compounds formed by polymerization and consisting essentially of repeating structural units is called ‘Polymer’. Polymers have many original properties that can be further improved by a deep range of additives to increase their uses and applications. ;�w&�pn�a������z�%����z�u���9�5�'OY�2�z�$�XD�e�|L_pqt�0��r�ϖ�((3��⋠@@O)���~GAV���a�����KM=2��)��- �g^��7B`R+���@��m�1y�x21��W� �§��!柄Uy�bT�rMp-/����VA�k�ݣS ���GG0�$ ��b��� r� �P�� �F@���I��E�`��H��AX� '��:%@���pG� �P,pk(I@����Y��ET��L_y/�1h��3D061��J�?���w�Y���@�Ty�a'#��k ;�3�r!�=���Y��n���x!�f �ğ �v� Rheology is the study of the flow and deformation of materials, and is concerned with the relationships between stress, strain and time. In this study, epoxy, the most common type of polymer used by civil engineers is used to produce polymer resin. 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. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Get step-by-step explanations, verified by experts. 0000002825 00000 n 0000075806 00000 n Abstract. • Modern polymers also developed based on alkynes R-C C - R’ 7. ¾Polymers are also very sensitive to the rate of deformation (strain rate). What are polymers? 1 INDEX 1. The ), our clothes (polyester, nylons, etc. characteristics, but also affects the properties of the cured system, although the mechanical properties of a FRP composite are mainly dependent on the type, amount, and orientation of fiber. Dielectric relaxation 4. References 12. 14. Dielectrics in static fields 3. Intrinsically conductive polymers 10. Static charges 8. Copolymerisation • when more than one monomer is used. The process by which the polymers are formed is called polymerisation. 0000072039 00000 n • Tensile strength measures the forces needed to snap a polymer. • More tangles + more touching!!! <<71E67253F7509B4EA94E85F620AB634E>]>> Toxic Properties Of Polymers And Additives. 0000004523 00000 n 0000001289 00000 n hc06n�ee�7}]�%��횺*�l�T� #1K;Oc����. ), and our bodies (poly(nucleic acids), proteins, etc.). B�(>����9P 1ey�7�H$RB��F.��R���If�|W�k�4�p����쫾�Z�;X��_����(İ�W�.�Vm��)�,^� �H�r��H���Nw�2�n����EBҰÀ���B��Vi�Br,wr�;�.Q��~�X���˼�ʱϜ|W�w���[uVN��BJ�,&? polymers have the following general properties Polymers can be very resistant to chemicals Polymers can be both thermal and electrical insulators Generally, polymers are light in weight with varying degrees of strength Polymers can be processed in various ways to produce thin fibers or intricate parts. trailer • Both amorphous and crystalline areas in same polymer. Electrical Properties of Polymers covers topics on the electrical properties of polymers. Download full Toxic Properties Of Polymers And Additives Book or read online anytime anywhere, Available in PDF, ePub and Kindle. 0000002260 00000 n 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. PHYSICAL PROPERTIES OF POLYMERS The structure of polymers is hierarchical, and both the monomer organization and larger-scale structure affect the observable properties, such as phase transitions, strength, solubility, and elasticity. 0000001659 00000 n A polymer’s properties are strongly Addition polymerisation • Monomers contain C=C bonds • Double bond opens to (link) bond to next monomer molecule • Chain forms when same basic unit is repeated over and over. View CHARACTERISTICS OF POLYMERS USED-converted.pdf from METALLURGY 308 at NED University of Engineering & Technology, Karachi. Crystalline polymers • Areas in polymer where chains packed in regular way. Polymers are composed of non-metallic elements, found at the upper right corner of the periodic table. CHARACTERISTICS OF POLYMERS USED-converted.pdf - 1 INDEX 1 WHAT IS AEROSPACE, …………………………………………………………………3, ………………………………………………….3, …………………………………………………3, ………………………………………………………….3, IMPORTANCE OF POLYMERS IN AEROSPACE INDUSRTY, ……………………………………4, ………………………………………………………………...5, ………………………………………………………5. Synthesis of Polymers The mechanism of synthesis of natural polymers in living organisms, the biosynthesis, is extremely complex and is one of the most important topics in biochemistry. 0000003094 00000 n Introduction to Polymer Chemistry Frank W. Harris Wright State University, Dayton, OH 45435 Polymers are extremely large molecules that are essential to our very existence. Intrinsically conductive polymers 10. A semicrystalline polymer means a mixture of polymer single crystals (polymer lamellae) and amorphous polymer. 0000005071 00000 n One of the great design strengths of composites is the multiple choices of both polymer … What is Polymer? 2 Periodic table with the elements associated with commercial polymers in color. aerospace subsector and also history of aerospace are discussed below. The polymers swell in water and some polar solvents (neutralization may be required in some systems), producing viscous dispersions. The book discusses the electrical conduction in polymers; the structure and charge generation in low-dimensions; and the photophysical processes, energy transfer, and photoconduction in polymers. 0000001508 00000 n %PDF-1.4 %���� Of these, cross-linking Applications of electro-active and conductive polymers 11. function affects significantly many properties of polymers and is one of their important characteristics. subsector design, manufacture advanced rocket and spacecraft companies. This preview shows page 1 - 4 out of 8 pages. They are a main constituent of our food (starch, protein, etc. 0000004648 00000 n crystal polymers. Measurement of electrical properties 6. A compound consisting of long-chain molecules, each molecule made up of repeating units connected together •There may be thousands, even millions of units in a single polymer molecule •The wordpolymeris derived from the Greek words Stimuli responsive polymers can be broadly categorized into micelles, polyplexes and polymer drug conju- Ionic conduction, particulate and molecular composites 9. Introduction 2. 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 Good properties between 0-100 ºC: polyamides, polycarbonates, polyphenylene Aerospace industry involve in many subsector which contribute in the industrial growth such as commercial space. Carbon is the most common element in polymers. CHEM 379 – W20 Physical Properties of Polymers 6-1 6. The unit substance or substances from which the polymer is obtained is called a monomer. Characteristics of Polymers The majority of manufactured polymers are thermoplastic, meaning that once the polymer is formed it can be heated and reformed over and over again. Polymers range from familiar synthetic plastic such as polystyrene to natural bio-polymers such as DNA and proteins that are fundamental to biological structure and function. Carbon is the most common element in polymers. 0000000716 00000 n CHEM 379 – W20 Physical Properties of Polymers 6-1 6. Polymer crystals 7. One of the great design strengths of composites is the multiple choices of both polymer … These components combine into supramolecular structures that pack into the bulk material. Polymer solids are either amorphous or semicrystalline. 0000002788 00000 n A. Srivastava et al. 0000003447 00000 n Polymers can be used to produced to mimic cotton, silk, and wool fibers; porcelain and marble; and aluminum and zinc. Organic materials 2. i� �0�+9w+����$P`�c*|s�f�`l(�# �����e�* 1 Experiment 15: Exploring the World of Polymers Objective: In this experiment, you will explore a class of chemical compounds known as polymers.You will synthesize and modify polymers, test their properties and use a fabrication technique to produce an object from a polymer. ), our houses (wood cellulose, alkyd paints, etc. Mechanical properties of polymers 8. 0000003369 00000 n 0000005328 00000 n The polymers swell in water and some polar solvents (neutralization may be required in some systems), producing viscous dispersions. WHAT IS AEROSPACE The other group, the thermosets, cannot be remelted. And in 1958, the national aeronautics and space administrations, (NASA) have been successful in national advisory committee for aeronautics and also started the mercury manned. 162 21 Introducing Textbook Solutions. - Polymers are usually studied in the field of biophysics, polymer science and macromolecular science. startxref Dielectric breakdown 7. MSE 2090: Introduction to Materials Science Chapter 15, Processing of Polymers 4 ¾Mechanical properties of polymers change dramatically with temperature, going from glass-like brittle behavior at low temperatures to a rubber-like behavior at high temperatures. Polymers are those which consists of repeated structural units known as monomers. Dielectric relaxation 4. The degree of crystallinity has a strong ef-fect on the final matrix properties. Every polymer has its own characteristics, but most polymers have the following general properties Polymer - definition and classification of polymers. 0000044872 00000 n The polymers are substances with a seemingly endless range of features and colors. Mechanical properties of polymers 8. 2. hެU�n�F}�W�#U����f-b�5@�)��,��P��K�P�����4���)���s��ٙ�5"�4N ���S�*��;h Electrical properties, Polymers With today’s material technologies pushing the envelopes in terms of performance and cost, Evaristo Riande and Ricardo Diaz-Calleja have provided a timely work to address those intriguing aspects of materials, i.e., electrical : Evaristo Riande, Ricardo Diaz-Calleja, Anthony J. Rafanelli. This property allows for easy processing and facilitates recycling. Static charges 8. • Hydrocarbon polymers average of 100 repeating units necessary but only 40 for nylons. Equivalent Weight 76 ± 4 Dissociation Constant pKa = 6.0 ± 0.5

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