聚氨酯纳/微胶囊相变材料的制备方法及性能表征

Preparation and Properties of Polyurethane Nano/Microencapsulated Phase Changed Materials

采用一种新方法制备了以聚四氢呋喃醚(PTMG)为芯材的聚氨酯纳/微胶囊相变材料(PU-N/MEPCM),通过红外(IR),动态光散射(DLS),透射电镜(TEM),差示扫描量热法(DSC)和热重分析(TGA)等测试手段对PU-N/MEPCM的化学结构,粒径,形态,热性能,稳定性和外壳强度进行研究。结果表明,两亲性嵌段聚氨酯可以包裹在芯材外层形成纳/微胶囊,其粒子具有核壳型,复合型和聚氨酯粒子型三种结构;改变PU的羧基含量可以使芯材含量达到65%;粒径可以从198nm变化到420nm;相变焓可以达到纯芯材的65%;PU-N/MEPCM的热稳定性随着羧基含量的增加而变好。

The polyurethane nano/microencapsulated phase changed materials （PU-N/MEPCMs） with poly（tetramethylene ether glycol） as the core material were prepared by a new method. The chemical structure,particle size,morphology,thermal properties,thermal stability and strength of shell materials were characterization by infrared spectroscopy,dynamic light scattering,transmission electron microscopy,differential scanning calorimetry,thermogravimetric analysis,and etc. It is found that the core material is enwrapped by the water-borne segmented polyurethane. There are three kind of particle structures in the nano/microcapsules：core-shell structure,complex structure and polyurethane particle. The core material content reaches 65% by adjusting the carboxylic content. The particle sizes of PU-N/MEPCMs vary from 198 nm to 420 nm. The value of phase change enthalpy gets to 65% of that of core material. It is also found that the thermal stability becomes better with the increase of carboxylic content.