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H 0 - ( C H , - C H 70 )m- H +2CsOH C sO—(C H 7—CH-.0) —Cs
CsO—<CH7—CH-iO) —Cs + 2
w
H7C -C H -C H - 0 -C H - 0 C - ,H
s
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2
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о
CH 3
HO—(CH2- C H O ) - (CH:—CH 2
0
)m— <СН: - С Н О ) лН
I
C H
t
I " 01
CH -CH3
I
o
-
c
7
h s
CH7
I0 1
CH -CH3
I
o
-
c
,
h s
H
0
- ( C H 2- C H
0
) - ( C H : - C H :
0
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)„H
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CH,OH
CH 7OH
After the above reactions were performed with glutaraldehyde crosslinking
chains.
By varying the composition and amount of Copolymer unit crosslinker
thermosensitivity hydrogel could vary within wide limits, the degree of swelling
of the polymer in water decreases from 0.40 to 1.25 when the temperature
changes from 25 to 63 °C.
Application conetworks method for producing composite hydrogels, where
both components are highly hydrophilic water-soluble polymers, has not found
wide application. Furthermore, this method is actively used in the synthesis of
amphiphilic polymer systems. It will be considered in the discussion biphasic
hydrogels containing hydrophilic and hydrophobic components.
Preparation of composite hydrogels
for synthesis technology UPU any
composite hydrogels. This is due to ease of synthesis that does not require the
formation of covalent bonds between the two polymers. Binding
macromolecules is achieved thanks to the engagement of the two polymer
networks. One of the polymers may be linear. Multiple linear macromolecules
for engaging the other grid, and insoluble polymer providing strength polymer
systems of this type, called semi-interpenetrating polymer networks.
According to the UPU synthesis methods are divided into simultaneous and
successive. When using the first embodiment are formed both grids
simultaneously. This is possible if the grid formed by various independent
mechanisms. In the second embodiment, the process is supposed to hold in two
stages. Initially, the first grid is formed, and then saturated crosslinked polymer
components constituting a second grid, after which the second grid is formed.
Usually prefer the second option, allowing fine control the phase separation, the
morphology of the resulting polymer composition.
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