2010-03-22 Chapter 14 Polymer Structures

2010-03-22 Chapter 14 Polymer Structures - CHAPTER 14:...

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Chapter 14 - 1 ISSUES TO ADDRESS. .. What are the basic microstructural features ? How are polymer properties effected by molecular weight ? How do polymeric crystals accommodate the polymer chain? CHAPTER 14: POLYMER STRUCTURES
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Chapter 14 - 2 Engineering Materials Plastics Elastomers Composites Ceramics PMC CMC MMC C/C Cu Al Mg Ti Steel Cast Iron …and their alloys Metals  (Metallic Bond) Non-Metals PMC – Polymer Matrix Composites CMC – Ceramic Matrix Composites MMC – Metal Matrix Composites C/C – Carbon Carbon Composites Ferrous Non-Ferrous Thermoplastics Thermoset (Covalence Bond) Polymers
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Chapter 14 - 3 Polymer Definition What is a polymer? Poly mer many repeat unit Adapted from Fig. 14.2, Callister 7e. C C C C C C H H H H H H H H H H H H Polyethylene (PE) Cl Cl Cl C C C C C C H H H H H H H H H Polyvinyl chloride (PVC) H H H H H H Polypropylene (PP) C C C C C C CH 3 H H CH 3 CH 3 H repeat unit repeat unit repeat unit
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Chapter 14 - 4 Ancient Polymer History Originally natural polymers were used Wood – Rubber Cotton – Wool Leather – Silk Oldest known uses Rubber balls used by Incas Noah used pitch (a natural polymer) for the ark
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Chapter 14 - 5 Basic Concepts Organic Chemistry is the study of carbon compounds (except the oxides and carbonates). Polymer chemistry and biochemistry are special subsets of organic chemistry. Many organic materials are hydrocarbons, consisting of carbon and hydrogen. The basic molecular structure of a polymer is a long chain of carbon atoms that are covalently bonded together, with two of their available four bonds per atom. The remaining two bonds normally are shared with other atoms, which are also covalently bond. Note: Primary interatomic bonds are ionic, covalent, and/or metallic. Secondary, van der Waals, or physical bonds are weak in comparison to primary bonds.
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Chapter 14 - 6 An atom is the smallest particle of an element. Each atom has a very small nucleus composed of protons and neutrons. Electrons are assumed to revolve around the atomic nucleus in discrete orbits. Valence electrons are those that occupy the outermost filled shell. These electrons are extremely important, as they participate in the bonding between atoms to form atomic and molecular structures. Many physical and chemical properties of solid are based on these valence electrons. Carbon atom has 4 valence electrons.
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This note was uploaded on 09/30/2011 for the course PHYSICS 1410 taught by Professor Falco during the Spring '08 term at Texas State.

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2010-03-22 Chapter 14 Polymer Structures - CHAPTER 14:...

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