Biomedical Engineering Reference
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Figure 4. Thermograms of the specimen of block-copolymer of chitosan with MA after the action of
Aspergillus terreus
(series No.2) obtained at three repeated heating cycles: (1) the first, (2) the second,
(3) the third.
Figure 5. Thermograms of the specimen of block-copolymer of chitosan with MA after the action of
Aspergillus terreus
(series No. 1) obtained at three repeated heating cycles: (1) the first, (2) the second,
(3) the third.
Devitrification in the PMA was observed at t
с
=14.5
о
С (Figure 3.A, curve 4; Table 1). The
value found for PMA in literature [25-27] is t
с
=6-8
о
С. However, based on more reliable
calorimetric data of B.V. Lebedev [28] t
с
(PMA) = 12
о
С. The PMA temperature t
с
determined
by us was higher as compared to the value obtained when measuring the heat capacity [28]
that is likely to be explained by a dynamic mode of specimen heating in the DTA experiments
[29].
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