MET 34800 – Engineering Materials Chapter 8

MET 34800 – Engineering Materials Chapter 8...

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MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department
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CHAPTER 8 POLYMER FAMILIES 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 polymer chemistry and how chemical similarities create polymer and elastomers families have a feeling for the distinguishing characteristics between polymer families have an understanding of the field of plastics through a simplification of the knowledge of polymer families CHAPTER GOALS
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Importance of the “mer” – it is a plastics “composition” The universe of plastics thermoplastic thermosetting commodity engineering elastomers coatings Why commodity plastics are different (cost, availability, variety of properties) 8.1 IDENTIFICATION OF POLYMER FAMILIES
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Figure 8–1 Estimated relative usage of thermoplastics and thermosetting plastics in the USA in 2008 (various sources) 8.1 IDENTIFICATION OF POLYMER FAMILIES
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Concept of a homopolymer Acronyms for “mers” 8.2 THERMOPLASTIC COMMODITY PLASTICS
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Formation of polyethylene and polyvinyl chloride 8.2 THERMOPLASTIC COMMODITY PLASTICS
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8.2 THERMOPLASTIC COMMODITY PLASTICS Ethenic polymers – note substituent differences (Table 8-1) Polyethylene (PE) types Ultra-high molecular weight (PE – UHMWPE) – different from the others Polypropylene (PP) – structure/variants Polyvinyl Chloride (PVC) – structure/spectrum of properties Polystyrene (PS) 8
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Table 8–1 Ethenic polymers 8.2 THERMOPLASTIC COMMODITY PLASTICS
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Polyallomer 8.2 Thermoplastic Commodity Plastics: Ethenic Polypropylene
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Figure 8–2 Variation of room temperature yield strength of polyethylene with density 8.2 THERMOPLASTIC COMMODITY PLASTICS: ETHENIC
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Figure 8–3 UHMWPE tip on a snow shovel 8.2 THERMOPLASTIC COMMODITY PLASTICS
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Figure 8–4 Approximate tensile yield strength of ethenic homopolymers 8.2 THERMOPLASTIC COMMODITY PLASTICS: ETHENIC
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8.2 THERMOPLASTIC COMMODITY PLASTICS: ETHENIC Summary: Polyethylenes can have significantly different properties, depending on the molecular weight (the length of the molecular chains). Polyethylenes are mostly low-strength polymers, but the UHMWPE grades can have strengths comparable to engineering plastics.
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