科研之友
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摘要
The new concept of the glass-transition temperature of the partially freeze-concentrated solution (T-gf) is brought forward and a new method is given for measuring T-gf of 20% and 45% glucose solution using differential scanning calorimetry (DSC), which is based on annealing samples for long periods of time at different temperatures. The influence of annealing temperature on T-gf is studied. It is found that the T-gf increases initially with annealing temperature up to -50 degrees C, and decreases as the temperature continues to increase, and exhibiting a good linear relation in both cases. The same phenomenon was observed for glucose solutions of different concentrations. It is concluded that the T-g'; (glass transition temperature of the maximally freeze- concentrated solution) can be determined from the intersection of the two curves reflecting the T-gf change with annealing temperature. The optimal annealing temperature (-50 degrees C) and accurate glass transition temperature (T-g';, -55 degrees C) of glucose solution are obtained.
- 出版日期2006-11
- 单位上海理工大学
