Rana zia ur rehman My first presentation in my undergraduate Engineering Career. Graduate Reseracher at KASIT (Korea Advanced of science & Technology) My Email ID: ranazia517@gmail.com

2.  SARFRAZ AHMAD 2010-IM-55
 ZIA UR REHMAN 2010-IM-56
 AHMAD 2010-IM-57
 NABEEL YONAS 2010-IM-58

4. CONTENTS:
WHAT IS POLYMER?
HISTORY OF POLYMER
SYNTHESIS
TYPES
properties
ADVANTAGES
DISADVANTAGES
USES

5. In 1920 German chemist Hermann
Staudinger (1881–1965) made his
macromolecular hypothesis, suggesting that
polymers are actually giant molecules formed
by the permanent attachment of countless
smaller molecules.

6.  Polymer is an organic macromolecule
made up of many small molecules which
are called monomers.
 These small molecules are covalently
bonded together to form polymer.

16. If we want to
know how well a
material resists
deformation, we
measure
something called
modulus.

17. Elongation is a type of deformation.
Deformation is simply a change in shape
that anything undergoes under stress.

21. In order for a polymer to be flexible, its various units or segments
must be able to move. The glass transition temperature (T g ) is the
temperature where polymer units or segments can move but the
entire chain cannot. Most vinyl polymers have T g values below room
temperature so that they appear to be flexible and act as rubber and
plastic materials. Most condensation polymers have T g values above
room temperature and are used as hard plastics and fibers.
The temperature where entire chain movement occurs
is called the melting point (T m ) and is greater than the
T g .

22. Brittle at room temperature
The inflexible regions of a polymer, such as
crystalline regions, are often referred to as "hard"
regions.
Flexible regions of a polymer, where segmental
mobility occurs, are referred to as "soft" regions.

39. THANK YOU

40. ANY
QUESTION?