Evaluation of effective parameters on cold duration in cryo accumulator gels

Cryo accumulator gels can retain cold temperature for long periods of time. These gels are used in medicine and transporting of medico-biological objects in cold condition. In this paper, two types of gels, the so-called soft gel and hard gel, have been formulated. Polyacrylamide, which was synthesized by precipitation polymerization in acetone, has been used as a gel in formulation of these cold packs. To evaluate the cold duration in the formulated gels, temperature changes of these gels have been measured versus time. Performed tests showed that cold duration in hard gels is longer than in soft gels, on precise term, average life of a soft gel is about 3 h and for a hard gel is about 10 h. Also, the polyacrylamide crosslinking density affects the cold duration in soft gels. It has been evaluated and observed that with changing this parameter we can substantially extend the cold life of these gels