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Rishi Mali
Monomer 
• A monomer is a molecule that may bind chemically to 
other identical molecules to form a polymer 
• The most common natural monomer is glucose, which 
is linked by glycosidic bonds into polymers such 
as cellulose and starch, and is over 77% of the mass of 
all plant matter. 
• The process by which monomers combine end to end 
to form a polymer is called polymerisation. 
© RAGC – for private circulation only
Monomer 
© RAGC – for private circulation only
Polymer 
 Polymers consist of repeating molecular units which 
usually are joined by covalent bonds. 
 A polymer may be a natural or synthetic 
macromolecule comprised of repeating units of a 
smaller molecule (monomers) 
 A polymer is a large molecule, or macromolecule, 
composed of many repeated subunits. 
© RAGC – for private circulation only
Polymer 
© RAGC – for private circulation only
Polymer Chain 
 Polymer chains are large molecules, or macromolecules, 
made up of many monomers that are joined together. 
 A number of different characteristics of a polymer chain 
determine the polymer's behavior as a molecule and also 
how it interacts with other molecules. 
 The name of each polymer chain is often derived from the 
monomer backbone 
© RAGC – for private circulation only
Examples of Polymer Chain 
 Linear Polymer 
 Branched Polymer 
 Cross Linked Polymer 
© RAGC – for private circulation only
Linear Polymer 
 A polymer in which the molecules form long chains 
without branches or cross-linked structures. 
© RAGC – for private circulation only
Branched Polymer 
 Polymers with branches at irregular intervals along the 
polymer chain are called branched polymers 
© RAGC – for private circulation only
Cross Linked Polymer 
 Cross-linked polymers contain short side chains 
(cross links) that connect polymer chains into a 
“network”. 
 Elastomers are elastic polymers created by limited 
cross-linking 
© RAGC – for private circulation only
Addition (Chain) Polymerization 
11 
– Initiation 
– Propagation 
– Termination
Crystallinity 
 Crystallinity refers to the degree of structural order in 
a solid. In a crystal, the atoms or molecules are 
arranged in a regular, periodic manner. The degree of 
crystallinity has a big influence on hardness, 
density, transparency and diffusion 
 Crystallinity can be measured using x-ray diffraction, 
but calorimetric techniques are also commonly used. 
© RAGC – for private circulation only
Glass Transition Temperature 
 The glass transition is the reversible transition 
in amorphous materials (or in amorphous regions 
within semicrystalline materials) from a hard and 
relatively brittle state into a molten or rubber-like 
state. 
 The glass transition of a liquid to a solid-like state may 
occur with either cooling or compression 
 The configuration of the glass in this temperature 
range changes slowly with time towards the 
equilibrium structure. 
© RAGC – for private circulation only
An amorphous solid that exhibits a glass transition is called 
a glass. Supercooling a viscous liquid into the glass state is 
called vitrification. 
© RAGC – for private circulation only
Thank You 
© RAGC – for private circulation only

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Structure of polumeric materials

  • 2. Monomer • A monomer is a molecule that may bind chemically to other identical molecules to form a polymer • The most common natural monomer is glucose, which is linked by glycosidic bonds into polymers such as cellulose and starch, and is over 77% of the mass of all plant matter. • The process by which monomers combine end to end to form a polymer is called polymerisation. © RAGC – for private circulation only
  • 3. Monomer © RAGC – for private circulation only
  • 4. Polymer  Polymers consist of repeating molecular units which usually are joined by covalent bonds.  A polymer may be a natural or synthetic macromolecule comprised of repeating units of a smaller molecule (monomers)  A polymer is a large molecule, or macromolecule, composed of many repeated subunits. © RAGC – for private circulation only
  • 5. Polymer © RAGC – for private circulation only
  • 6. Polymer Chain  Polymer chains are large molecules, or macromolecules, made up of many monomers that are joined together.  A number of different characteristics of a polymer chain determine the polymer's behavior as a molecule and also how it interacts with other molecules.  The name of each polymer chain is often derived from the monomer backbone © RAGC – for private circulation only
  • 7. Examples of Polymer Chain  Linear Polymer  Branched Polymer  Cross Linked Polymer © RAGC – for private circulation only
  • 8. Linear Polymer  A polymer in which the molecules form long chains without branches or cross-linked structures. © RAGC – for private circulation only
  • 9. Branched Polymer  Polymers with branches at irregular intervals along the polymer chain are called branched polymers © RAGC – for private circulation only
  • 10. Cross Linked Polymer  Cross-linked polymers contain short side chains (cross links) that connect polymer chains into a “network”.  Elastomers are elastic polymers created by limited cross-linking © RAGC – for private circulation only
  • 11. Addition (Chain) Polymerization 11 – Initiation – Propagation – Termination
  • 12. Crystallinity  Crystallinity refers to the degree of structural order in a solid. In a crystal, the atoms or molecules are arranged in a regular, periodic manner. The degree of crystallinity has a big influence on hardness, density, transparency and diffusion  Crystallinity can be measured using x-ray diffraction, but calorimetric techniques are also commonly used. © RAGC – for private circulation only
  • 13. Glass Transition Temperature  The glass transition is the reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle state into a molten or rubber-like state.  The glass transition of a liquid to a solid-like state may occur with either cooling or compression  The configuration of the glass in this temperature range changes slowly with time towards the equilibrium structure. © RAGC – for private circulation only
  • 14. An amorphous solid that exhibits a glass transition is called a glass. Supercooling a viscous liquid into the glass state is called vitrification. © RAGC – for private circulation only
  • 15. Thank You © RAGC – for private circulation only

Editor's Notes

  1. 11