Synthesis and characterization of nano-TiO2 modified chitosan/paraffin phase change microcapsule
Song Yu1,2, Qiu Xiaolin1,2, Chen Xiaojing1,2
1. College of Mechanical Engineering,Jiangnan University,Wuxi 214122; 2. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Wuxi 214122
Abstract: Phase change paraffin at 36℃ was used as the core material,and natural polymer chitosan modified by nano-TiO2 was used as the wall material to prepare phase change microcapsules with anti-UV functionality by emulsion crosslinking method.The effects of different factors on the properties of microcapsules were investigated.The optimized experimental results were obtained and revealed that the encapsulation efficiency of the microcapsules was 81.61%,when emulsifier dosage was 10%,oil-water ratio was 3∶1 and nano-TiO2 dosage was 0.12g.Through the analysis of scanning electron micrograph (SEM),differential scanning calorimetry (DSC),thermogravimetric analyzer (TGA) and UV-Vis spectrophotometer,the results showed that the microcapsule had smooth surface,regular morphology,latent heat of phase change of 118.90J/g,good thermal cycle and thermal stability,as well as UV shielding function.
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