One kind of binary eutectic phase change material was prepared by melt blending method with lauric acid (LA) and myristic acid (MA).The effect of mass fraction on crystallization temperature of LA-MA mixture was conducted by step cooling curve method.The hypoeutectic point was obtained by drawing the phase diagram of the mixture system,where the mass ratio of LA to MA was 3:1 and the eutectic temperature was 32.7℃.The latent heat of the eutectic system was 160.5J/g.FT-IR experimental results shown that LA and MA were integrated under molecular force in the binary composite and no chemical reaction occurred.After 500 times of 20～70℃ thermocycling,the phase change temperature of the composite had little change,and it indicated that the stability of LA-MA mixture was good.TG tests shown that there was no obvious mass loss when the temperature was less than 100℃.LA-MA binary composite phase change material was suitable for wall and other building envelope.
Xu Feng, Sun Zhigao
. Preparation and property of lauric acid-myristic acid binary composite phase change material[J]. New Chemical Materials, 2021
, 49(11)
: 156
-159
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.11.033
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