04/21/23 1

Physical Polymer

B.Pourabbas

Faculty of Polymer Eng.

Sahand University of Tech.

pourabas@sut.ac.ir

What We Study?

1. Physical Aspects of the Chain Properties:

• Such as:– Thermal Behavior:

• Melting,

• Tg,

• Other transitions and so on.

04/21/23 2

What We Study?

– Solubility• The solvent-polymer interactions

• The effect of conditions: temperature and pressure Chain structure and so on

04/21/23 3

What We Study?

– Surface and interface properties• Surface dynamics

• Surface energies

04/21/23 4

What We Study?

– Mechanical Properties• Rubber Elasticity

• Rubber-glass transitions

• Yielding

• Viscoelasticity

04/21/23 5

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

04/21/23 6

What We Study?• The size of the chains

– Statistically defined molecular weights– Width of polydispersity

04/21/23 7

What We Study?3. The methods for measurement of the

properties:

• Chemical Methods:– Elemental Analysis– Functional Group Analysis– Selective Degradation

04/21/23 8

What We Study?• Physical Methods:

– NMR– IR & Raman– UV-visible– XPS– XRD

04/21/23 9

Where From We Study?

1. Introduction to PHYSICAL POLYMER SCIENCE; By: Sperling (pdf file is available)

04/21/23 10

Where From We Study?

2. Introduction to Polymer Physics

04/21/23 11

Where From We Study?

3. Polymer Physics

04/21/23 12

Where From We Study?

4. Polymer Physics

04/21/23 13

All the presentation files will be in your reach.

04/21/23 14

Your Class Activities

• Being in the class

• Homeworks

• Questions planed

• Projects and presentations

• Mid-Term exams (Several)

• Final Exam

04/21/23 15

Anythingelse?

04/21/23 16

Let’s Get Started

04/21/23 17

04/21/23 18

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),

04/21/23 19

Examples of Configurations and Conformations

1. Head to tail and head to head configuration

2. Trans-Gauche Conformation

04/21/23 20

Chemical Methods of Determining Microstructures

04/21/23 21

Physical Methods of Determining Polymer Chain Microstructure

04/21/23 22

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

04/21/23 23

04/21/23 24

Common Types of Copolymers

1. Unspecified Copolymers

2. Statistical Copolymers

3. Random Copolymers

4. Alternating Copolymers

5. Periodic Copolymers

04/21/23 25

Multi Component Polymers

1. Block Copolymers

2. Graft Copolymers

3. AB-Cross-Linked Copolymers

4. Interpenetrating Polymer Networks

04/21/23 26

Energy and Conformational States in Polymers

04/21/23 27

Example: Microstructure of Polystyrene

28

29

Questions.

• Fractal! What is fractal nature. Why polymer chains are fractal in dimension?

04/21/23 30

04/21/23 31

End of Chapter 1