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MET 34800 – Engineering Materials Chapter 7

MET 34800 – Engineering Materials Chapter 7...

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MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department
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CHAPTER 7 PRINCIPLES OF POLYMERIC MATERIALS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski
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Upon completion of this chapter, the student should: have an understanding of how polymerized organic materials form engineering materials have an understanding of the chemical makeup of polymeric materials have an understanding of the techniques that are used to strengthen polymers CHAPTER GOALS In this chapter, we will discuss how polymers are created, their chemistry, their bonding mechanisms, their strengthening. Our chapter objective is that students understand the concept of polymerization and where different polymers come from. 3
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Natural polymers (lignin, shellac, etc.) Chronology of plastics Definition of a polymer Definition of polymerization INTRODUCTION 4
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Figure 7–1 Chronological development of important engineering polymers INTRODUCTION 5
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Addition reaction Condensation reaction Monomer or mer symbol Saturated and unsaturated bonds Hydrogen atom substituents Determination of molecular weight Use of FTIR for analysis Copolymerization Stereospecificity Blends, alloys, homopolymers, macromolecules 7.1 POLYMERIZATION REACTIONS 6
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Figure 7–2 Polymerization reactions 7.1 POLYMERIZATION REACTIONS 7
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Figure 7–3 Infrared spectroscopy for analysis of polymers 7.1 POLYMERIZATION REACTIONS 8
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7.2 BASIC TYPES OF POLYMERS 9 Figure 7–4 Spectrum of polymeric materials and some of the important thermoplastic and thermosetting plastic families. Commodity plastics generally have lower cost, and they are the most used plastics. Engineering plastics include all others.
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Basic polymer structures: linear branched cross-linked Chain stiffening Isotactic/syndiotactic, etc. Amorphous vs Crystalline Polymers Definition of amorphous Definition of crystalline Melting point Specific volume “Melting” in amorphous polymers Glass transition temperature Properties of amorphous polymers Properties of semi-crystalline polymers 7.3 ALTERING PROPERTIES OF POLYMERS 10
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Additives Compounded plastics (master batch, etc.) Fillers Plasticizers Stabilizers and antioxidants Particles Reinforcing with other plastics (interpenetrating networks) 7.3 ALTERING PROPERTIES OF POLYMERS 11
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Figure 7–5 Schematic of polymer chains in a linear polymer 7.3 ALTERING PROPERTIES OF POLYMERS 12
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Figure 7–6 Polymer chains in a branched polymer 7.3 ALTERING PROPERTIES OF POLYMERS 13
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Figure 7–7 Cross-linked polymer 7.3 ALTERING PROPERTIES OF POLYMERS 14
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Figure 7–8 Strengthening due to chain stiffening 7.3 ALTERING PROPERTIES OF POLYMERS 15
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