8/7/20151 Physical Polymer B.Pourabbas Faculty of Polymer Eng. Sahand University of Tech....
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Transcript of 8/7/20151 Physical Polymer B.Pourabbas Faculty of Polymer Eng. Sahand University of Tech....
04/21/23 1
Physical Polymer
B.Pourabbas
Faculty of Polymer Eng.
Sahand University of Tech.
What We Study?
1. Physical Aspects of the Chain Properties:
• Such as:– Thermal Behavior:
• Melting,
• Tg,
• Other transitions and so on.
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What We Study?
– Solubility• The solvent-polymer interactions
• The effect of conditions: temperature and pressure Chain structure and so on
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What We Study?
– Surface and interface properties• Surface dynamics
• Surface energies
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What We Study?
– Mechanical Properties• Rubber Elasticity
• Rubber-glass transitions
• Yielding
• Viscoelasticity
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What We Study?2. The basic concepts and features which the
physical properties themselves depends on.• Chain Structure
– Liner– Branched– Cross-linked– Co-polymer– Chain Configuration– Chemistry– Crystalinity
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What We Study?• The size of the chains
– Statistically defined molecular weights– Width of polydispersity
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What We Study?3. The methods for measurement of the
properties:
• Chemical Methods:– Elemental Analysis– Functional Group Analysis– Selective Degradation
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What We Study?• Physical Methods:
– NMR– IR & Raman– UV-visible– XPS– XRD
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Where From We Study?
1. Introduction to PHYSICAL POLYMER SCIENCE; By: Sperling (pdf file is available)
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Where From We Study?
2. Introduction to Polymer Physics
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Where From We Study?
3. Polymer Physics
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Where From We Study?
4. Polymer Physics
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All the presentation files will be in your reach.
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Your Class Activities
• Being in the class
• Homeworks
• Questions planed
• Projects and presentations
• Mid-Term exams (Several)
• Final Exam
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Anythingelse?
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Let’s Get Started
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Chain Configuration
Polymer chains have three basic properties
1. The Molecular Weight,
2. The conformation of the chain in the space,
3. The configuration of the chain (microstructures),
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Examples of Configurations and Conformations
1. Head to tail and head to head configuration
2. Trans-Gauche Conformation
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Chemical Methods of Determining Microstructures
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Physical Methods of Determining Polymer Chain Microstructure
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Stereo Chemistry of Repeating Units
1. Chiral Centers
2. Tacticity in Polymers
3. Optical Isomerism
4. Geometric Isomerism
5. Substitutional Isomerism
Chiral Center
isotactic
syndiotactic
atactic
Meso And Racemic
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Common Types of Copolymers
1. Unspecified Copolymers
2. Statistical Copolymers
3. Random Copolymers
4. Alternating Copolymers
5. Periodic Copolymers
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Multi Component Polymers
1. Block Copolymers
2. Graft Copolymers
3. AB-Cross-Linked Copolymers
4. Interpenetrating Polymer Networks
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Energy and Conformational States in Polymers
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Example: Microstructure of Polystyrene
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Questions.
• Fractal! What is fractal nature. Why polymer chains are fractal in dimension?
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End of Chapter 1