Polypropylene is a thermoplastic polymer used in a wide variety of applications including packaging, textiles, laboratory equipment, and automotive parts. It was first produced in 1954 by an Italian professor and is commonly used today due to its high heat and chemical resistance. It exists in various grades including homopolymers, block copolymers, and random copolymers. Polypropylene is produced through addition polymerization of the monomer propylene and has a density of 0.946 g/cm3 and melting point of 160°C. It can be processed through techniques like extrusion, blow molding, and injection molding.

1. POLYPROPYLENE
ABDUL HANNAN
14MME-S1-319
5th SEMESTER
METALLURGICAL AND MATERIALS ENGINEERING
UNIVERSITY OF THE PUNJAB

2. INTRODUCTION
• Polypropylene is also named as polypropene which is a thermoplastic
polymer used in a wide variety of applications including packaging and
labeling, textiles (e.g., ropes, thermal underwear and carpets), stationery,
plastic parts and reusable containers of various types, laboratory equipment,
loudspeakers, automotive.
• Natta(professor) produced the first polypropylene resin in Spain in 1954.
And now due to fast growing automotive vehicles it is being used vastly in
world similarly if we take a look on its properties it has high heat resistance
and chemical resisitance.
• Due to low cost of PP it has huge terms of usage in packaging industries as it
contains duality in its characteristics that it is tough as well as flexible in
nature.

3. MONOMER,POLYMERIZATION,GRADES AND PRODUCERS
Monomer
propylene (C3H6)n
Polymerization method
Addition polymerization
Grades of polypropylene
Homopolymers (a general purpose grade)
Block polymers (incorporating of ethylene from 5-15% as
it enhances the impact resistance where temp. must be
below 20°C)
Random copolymers (1-7% ethylene is incorporated
selected where low temp. areas and enhanced clarity
and flexibility are advantageous)
Name of producers
• Giulio Natta and German chemist Karl Rehn in 1954.

4. CHARACTERISTICS
Density 0.946 g/cm3
Melting point 160°C
Glass transition temp -10°C
Commercial availability of
Polypropylene are
Isotactic and Atactic
Behalf of orientation
The arrangements in the polymer
defines its hidden properties.i.e
highly oriented yarn show very less
elongation but have very good
hardness whereas low orientation
manner enhances the elongation as
more side chains on the molecules
appear which make the polymer
flexible.
Processing techniques used to
produce products with
polypropylene
Extrusion
Blow Molding
injection molding
Graph

5. RESEARCH PAPER WORK
• The addition of polypropylene (PP) fibres to high-performance concrete (HPC) is
one way to avoid spalling of concrete under fire conditions. The present work
contributes both to the understanding of the way in which fibres act and to
optimising the fibre dosage. Pore pressure measurements performed on heated
specimens showed that the presence of fibres led to a large decrease in the extent
of the pressure fields that build up in the porous network during heating. This effect
was also significant at dosages lower than the theoretical percolation threshold.
These results are supported by permeability measurements carried out after various
heat treatments and for various fibre dosages: they showed the striking effect of
fibres from 200°C up, that is, very close to their melting temperature. The role of
fibres is discussed through the analysis of concrete microstructure and fibre–matrix
interactions as function of heat treatment.
• (Cement and concrete research volume 31, issue 10th oct, 2001)

6. LIMITATIONS
• PP plastic is the product has a resistance to the addition of paint or ink once
the cooling process has completed. This can make the raw material more
difficult to work with, especially in applications where the polypropene is
being used to create household products, such as shelf organizers.
• textile manufacturers have to be constantly aware of the temperature of the
machinery while the fiber is going through the process. If the fiber becomes
too hot, there is a tendency to break and jam on the rollers of many types of
textile machinery.
Thankyou 