Preparation and Properties of Modified PolyGram Nano-Microencapsulated Phase Change Materials
The nano-microencapsulated phase change materials were prepared ,with butyl stearate as core material, styrene-maleic anhydride copolymer (SMA) as dispersant and emulsifier, polyurea resin as shell material which was synthesized from monomer 2, 4- toluene diisocyanate (TDI) and diethylen etriamine (DETA),and was modified by glycerol, nanometer material(TiO2) as functional material. We have analyzed the compactness, stabilities, phase transition temperature, and bactericidal efficiency of microcapsules. The results show that the compactness properties and stabilities properties of the modified microcapsule, when the ratio of core material and shell material is 3:4, such as washing stability properties and thermal stability properties are obviously improved than that of non-modified, phase transition temperature rises from 23.2°C to 24.2°C,bactericidal efficiency of Nano-Micro-PCMs is 7~8 times more than that of separate using of nanometer material （TiO2）, modified polyurea Nano-Micro-PCMs may have extensive application prospects in the fields of architecture, textile and air-conditioning filtering materials.
Guojun Zhang and Jessica Xu
Y. D. Tang et al., "Preparation and Properties of Modified PolyGram Nano-Microencapsulated Phase Change Materials", Advanced Materials Research, Vols. 160-162, pp. 7-12, 2011