Polymer Structures, Applications and Processing

Polymer Structures, Applications and Processing - MLE1101...

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MLE1101 Polymer Structures, Applications and Processing Prof SH Teoh Department of Mechanical Engineering National University of Singapore mpetsh@nus.edu.sg EA 05-30 Lectures (2 hr) Part 1: Basic Polymer Science, Structure and Mechanical Behaviour of Polymers Part 2: Processing of Polymers
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2 REFERENCES Main: W D Callister, Materials Science and Engineering: An Introduction, 7 th Edn, Wiley Asia Student Edn,, John Wiley & Sons, Inc., 2007, Ch 15 Others: 1. NG McCrum, CP Buckley and CB Bucknall Principles of Polymer Engineering, 2 nd Ed, Oxford Sci Pub, 1997. 2. MF Asby & DRH Jones, Mechanical behaviour of polymers. In: Engineering Materials 2: An Introd Microstructures, Processing and Design, Pergamon Press, 1986, Ch 23. 3. RJ Crawford, Plastics Engineering, 2 nd Ed, Pergamon Press, 1987 4. JA Brydson, Plastics Materials, 5 th Ed, Butterworth Heinemann, 1989 5. MM Farag, Polymeric materials and their processing. In: Selection of Materials and Manufacturing Processes for Engineering Design, Prentice Hall, NY 1989, Ch 4. Video Program (1 hr) 1. Plastic Materials 2. Manufacturing with Plastics
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3 Video Presentations 1. Plastic Materials 2. Manufacturing with Plastics Remarks: Take notes on: •the various polymers mentioned, •their properties, •processing methods and •applications.
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4 POLYMERS 1.0 Introduction 1.1 Reasons for extensive use of plastics 1.2 Classification of Plastics 3.0 Polymer Structures 3.1 Classification 3.2 Crystallinity 3.2.1 Influence of crystallinity on physical properties 3.2.2 Changes in polymer structure with deformation SUMMARY 2.1 Basic building elements for polymers 2.2 Polymerisation 2.2.1 Addition Polymerisation 2.2.2 Condensation Polymerisation 2.3 Molecular Architecture 2.4 Molecular Weight 2.4.1 Molecular Weight Distribution 2.0 Basic Polymer Science 2.3.2 Isomerism due to different locations of double bonds 2.3.1 Isomerism due to different locations of atomic groups
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5 POLYMERS 1.0 Introduction Polymers are enormous molecules consisting of many repeat units called MONOMERS linked together in a long chain E.g. Polyethylene (PE) -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 - Repeat unit -CH 2 -CH 2 - Two categories: 1) Natural polymers (e.g. wood, collagen, wool, leather, latex) 2) Synthetic polymers (e.g. PVC, PE, ABS, PC, Nylon) Plastics = synthetic polymers + additives
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6 1.1 Reasons for extensive use of plastics i) Require low energy for production ii) High strength to weight ratio iii) Resistant to corrosion iv) Can be coloured easily - good aesthetic appearance v) Easily reinforced with fibres to form strong composites vi) Easily molded to any shape Artificial Limb Polypropylene CFRP
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7 Elastomers are usually lightly cross-linked macromolecules. Typical examples are silicone rubber used in making contact lenses and polyurethane used in making foam beds. Because of its rubbery viscoleatic properties resembling that of natural tissue, they are by far the most extensively used polymeric implant materials. Low water adsorption ones are use as tubes, cathethers pacemakers leads, blood bags. High water adsorption ones (poly hyroxyethyl methacrylate - PHEMA) are use in contact lens, burn dressings and coatings.
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This note was uploaded on 03/29/2008 for the course MLE 1101 taught by Professor Zhang during the Spring '08 term at National University of Singapore.

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Polymer Structures, Applications and Processing - MLE1101...

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