Universum: технические науки

2. Classification of polymers 
2.1. Based on sources.
2.1.1.Natural polymers:
These are substances that 
are naturally obtained in life, such as living organisms 
such as pigs and chickens. Even our bodies contain 
many natural polymers, such as proteins and nucleic ac-
ids. Alternatively, it is obtained through the polymeriza-
tion process such as polyethylene, polyacrylates and 
methacrylate[1] [2]. 
2.1.2.Synthetic polymers:
These polymers are 
compounds are obtained laboratory by chemical reac-
tions by binding the monomers together. It is intended 
for use in various applications that are incompatible with 
natural polymers such as poly (L-lactic glycolic 
acid)[2]. 
2.1.3.Semi-synthetic polymers: 
This type of mate-
rials are materials in which the original polymer is man-
ufactured in a chemical-treated but the origin of this sub-
stance is a natural polymer.
 
Like cellulose, it is a natural 
polymer and after treatment, it contains nitrocellulose. 
Samples include nylon, polyester and Teflon[2]. 
2.2. Based on structure. 
2.2.1.Linear polymers:
It is a long continuous 
chain of carbon that binds to hydrogen bonds between 
carbon and carbon and takes its name from the polymer 
structural repeat unit. It is dissolved with ion exchange 
groups in water. In addition, bound together by ion 
cross-linking agents. It has high melting points, such as 
poly (vinyl chloride)[2]. 
2.2.2.Branched polymers:
This kind of polymers 
that contain secondary polymer chains that link to the 
primary spine. This bond is polymeric or H-shaped, hav-
ing low tensile strength, low density, low boiling and 
melting points compared to its predecessor. It differs 
from linearity because it is less solid and dense, also 
fragile because the linear polymer contains a large num-
ber of relatively short branches. Examples include starch 
and glycogen[2].