热敏型微胶囊显示材料的渗透与显影特性研究

摘要

The thermal development microcapsule with polyurea shell was synthesized with interracial polymeri- zation method, which was a type of information display material. Thermal properties of polyurea shell are stud- ied by TG/DSC thermal analysis technology. The permeation of developer D-8 was realized by heating method at different temperature and times. The permeation results are detected by infrared spectroscopy technology, and compared with the changes of image density of sample versus the temperature and heating time. The results show that thermal stability temperature of microcapsule shell synthesized by isophorone diisocyanate （IPDI） was about 250℃, and the phase change temperature Tg was about 170℃. The results of infrared spectroscopy show that permeability of developer 13-8 increases exponentially with the heating temperature, but increases lin- early with the heating time. Image density of sample increases gradually with temperature and heating time, and there are good consistency between the results of thermal development and the result of infrared spectroscopy.%利用界面聚合技术制备了以聚脲为壁材的热显影微胶囊。采用热重-差示扫描量热分析技术（TG／DSC）研究了聚脲囊壁的热稳定特性；利用红外光谱技术对显色剂D-8在不同温度及时间条件下热渗透结果进行了检测，并与微胶囊显影密度随加热时间及温度的变化进行了对比。实验结果表明，由IPDI聚合形成的聚脲囊壁热稳定温度在250℃左右，在170℃附近发生玻璃态到高弹态的相转变；显色剂D8的渗透率随加热温度升高呈单指数增长而随加热时间的延长呈线性增长；微胶囊显影密度随加热温度及时间的增加而增大，且热显影结果与红外检测结果具有较好的一致性。