(copolymer molar mass 1,250,000 g/mol; molar degree of modification 32, 37, and
40 %), the maximum value of the GF yield was achieved at an initial copolymer
concentration of 2 mass%, irradiation time 4 min (irradiation dose 22.8 J/cm
2 ), and
5 mass% BBTMAC.
Photochemical crosslinking of high molar mass polyacrylamide (PAAm) in a
frozen aqueous system has been achieved as an alternative to the commonly used
synthesis of PAAm cryogels from acrylamide. Advantageously, starting from a
high molar mass precursor one may omit the use of crosslinking agent [16].
Fig. 9 Degree of swelling
(ES) of HEC–chitosan
cryogels of different
composition in acidic and
neutral water. Cryogels
were prepared at a freezing
temperature of À20
C,
initial polymer
concentration 1.5 mass%,
30 mass% BisAAm,
irradiation time 2 min.
Reprinted from [18] with
permission from Elsevier
Fig. 10 Temperatureresponsive poly(glycidolco-ethyl glycidyl
carbamate)
(hydrophobically modified
polyglycidol) precursor
used for the synthesis of
cryogels. Reprinted from
[19] with permission from
Elsevier
208
P.D. Petrov and C.B. Tsvetanov