The "gelled" material maintains its shape even as the PCM cycles between solid and liquid form. ..
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Entropy Solutions has developed shape-stabilized versions of two of its PureTemp biobased phase change materials. These gelled PCMs maintain their shape even as the PCM cycles between solid and liquid form, absorbing, storing and releasing thermal energy as needed in temperature-control applications. Potential uses include building materials, underfloor electric heating systems and shipping containers.
The gelled PureTemp 4, right, has a latent heat of 159.4 joules per gram, a melt point of 4.81º Celsius and a freeze point of 1.07º Celsius. The gelled PureTemp 20 has a latent heat of 149.3 J/g, a melt point of 21.39º C and a freeze point of 16.85º C. The addition of polymers accounts for the observed reductions in latent heat compared to the ungelled versions.
The gelled forms ensure even distribution of PCMs contained in thin films. The PCM does not leak from the polymer matrix after thermal cycling. Other properties of these lab-scale versions include:
• Narrow melting range
• Soft when the PCM is in the liquid state
• Stiff/hard when the PCM is in the solid state
• Minimized leakage if enclosing film is punctured
Entropy Solutions is exploring scale-up and commercialization options for the new material.
About Entropy Solutions LLC
Entropy Solutions is a biobased specialty chemical company with offices in Plymouth, Minn., and Tuscaloosa, Ala. Its PureTemp PCM technology is the world’s first 100 percent renewable-based phase change material. Entropy partners with leading product development companies in the shipping, construction, textile, health care and alternative energy industries. PureTemp has received global recognition, including the DuPont Diamond Innovation Award, and has earned biobased certification from the USDA.
Entropy Solutions LLC