Universum: технические науки

2.5. Susceptibility of backbone. (not given in fig-
ure. 1) 

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№ 10 (91)
октябрь, 2021 г. 
45 
2.5.1.Degradable polymers:
This type of polymers 
that dissolve external influences, such as microorganisms, 
acids, or strong bases, leaving behind by-products that 
are soluble in water so that these wastes do either not 
because any dangerous effects, and finally they metabolize 
or are excreted outside the body. Such as poly (L-lactic 
acid), poly(glycolic acid)[2]. 
2.5.2.Non- degradable polymers:
These substances 
meant to not degrade by biological agents. It does not 
degrade to an environmentally safe natural condition 
over time. It consists of long chains of carbon and hy-
drogen atoms, most of which are plastic materials that 
are difficult for enzymes and organisms to break their 
bonds and digest. Among its peculiarities is that it is 
cheap, varied and durable. Such as polyhydroxy butyrate 
(PHB), polycaprolactone (PCL)[2]. 
 
Figure 1. Classification of polymers 
 
3. Polymers used for skin tissue engineering. 
3.1. Natural polymers. 
3.1.1. Cellulose:
It is frequently used in wound 
dressings but not natural, but rather modified to active 
molecules such as antimicrobial agents, enzymes, anti-
oxidants, and growth factors. It is hydrophilic and bio-
compatible with the hydroxyl group. Bacterial cellulose: 
is an innovative natural polymeric raw material with a 
nanostructured structure. It also used in wound dress-
ings, has high mechanical strength and has swelling 
properties. Carboxymethylcellulose (CMC) is widely 
used in cellulose wound dressing with the carboxyme-
thyl group. It is a loving, soluble and swollen polymer 
in water[4]
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