Class notes for Chemistry

engineering
chemistry

, MODULE 1


POLYMERS

, POLYMERS
* A
polymer is a
high mass molecular
mor
compound made
of many repeating chemical units
.
Emonomers]
GREEK
POLYMERS

many
I
poly iers' -
parts

* Degree of Polymerisation is the number
of repeating units
(monomers)
s

formed in a
.
polymer
& Polymerisation is the process
by which monacrs form
polymers.




eg .
(h ==] polymerisation
>
-
fit
ethylene polyethylene



() ⑳
menisation
fit
styrene polystyrene

* Homopolymer : -polymers made
up of only one
type of monomers


① ② ③
eg .
- CF2-CE2th tory-tetr tuz-unt
teflon d
polyethylene Pul



*
Copolymer-polymers made
up of
tro or more monomers .

, ① Alternating
: -A and B
alternating in a chain

-
~ - ·
- -
-

-
& .
# &
-
~ - - -
O &

·
& .
#
O
·
*

·
&
%... ..
*
%... ..
·




② Block : -

alternate w/ B
large blocks of
A

:000p expe000
·


..




③ Random :
-A and B positioned across the -

randomy
chain

-
·

④ Graft : --
chainS
·



↑
& B
grafted onto As back
.

.. o -
·

.00 on to en
09
* Classi cation of Polymers:
1. Based on origin:
A. Natural Polymers
These occur in nature in plants and animals and are very essential for life. For e.g., proteins,
nucleic
acids, Starch, cellulose, protein, silk, wool and natural rubber are some natural polymers.
B. Synthetic Polymers
Synthetic polymers are man-made polymers which include bers like te on and dacron,
synthetic rubbers,
Polyethylene, Polystyrene, polyvinylchloride, nylone, polyester




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