ME364 MET KS Ch7 - Chapter 7 Polymers: Structure, General...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chapter 7 Polymers: Structure, General Properties and Applications
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Plastics and Polymers Plastic: Natural organic or synthetic organic materials, capable of being molded, shaped, formed, machined, cast and joined into various shapes with ease. Requires minimal surface finishing operations, Available commercially as film, sheet, plate, rods and tubes. The word MER indicates the smallest building block (like a unit cell in a crystal). A MONOMER is the basic building block of a polymer. POLYMER means many mers repeated hundreds of times in a chainlike structures. Ethylene
Background image of page 2
3 Advantages of polymers (plastics) over metals: Corrosion resistance and resistance to chemicals, Low electrical and thermal conductivity, Low density, High strength to weight ratio (especially when reinforced), Noise reduction, Wide choice of colors and transparencies, Ease of manufacturing, Manufacturability of complex shapes, Relatively low cost, Disadvantages of polymers (plastics): Low strength and stiffness, high thermal expansion, low temperature range, lower dimensional stability in service.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Hairdryer Transformation Metallic components Plastic components Metal-plastic components
Background image of page 4
5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 A Plastic Marvel
Background image of page 6
7 Classification Family: POLYMERS (Plastics) Class: Thermoplastics Thermosets Elastomers Members: Acetals Alkyds Natural rubber Acrylics Aminos Synthetic rubber ABS Urea Silicones Cellulosics Melamines Polyurethane Fluorocarbons Polyesters Polyimides Polyimides Polycarbonates Polyesters Polypropylenes Polystyrenes PVC Technical Attributes: Physical, mechanical, thermal, electrical, optical, ecological, processing, acoustical, tactile attributes.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8
Background image of page 8
9 Mechanical Properties of Engineering Plastics
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 Chapter 7 Topics Figure 7.1 Outline of the topics described in Chapter 7.
Background image of page 10
11 Structure of Polymer Molecules Figure 7.2 Basic structure of polymer molecules: (a) ethylene molecule; (b) polyethylene, a linear chain of many ethylene molecule; and (c) molecular structure of various polymers. These are examples of the basic building blocks for plastics.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Polymerization Figure 7.3 (a) Condensation polymerization of nylon 6,6 and (b) addition polymerization of polyethylene molecules from ethylene mers. Polymerization reaction: Linking monomers into polymers to make longer molecules Condensation polymerization: Formation of bond between two types of reacting mers. Addition polymerization:
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/17/2009 for the course MECHANICAL ME 364 taught by Professor Prof.dr.abdülkerimkar during the Spring '08 term at Yeditepe Üniversitesi.

Page1 / 34

ME364 MET KS Ch7 - Chapter 7 Polymers: Structure, General...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online