摘要
为获得具有植物叶片近红外精细反射光谱特征的伪装材料,采用界面聚合法制备山梨醇水溶液微胶囊。选择聚脲为壁材,设计了两步升温的包覆工艺,通过反应温度的优化得到了水分含量达50%以上的山梨醇水溶液微胶囊。扫描电子显微镜下观察到微胶囊呈表面较为光滑的球形;紫外/可见/近红外分光光度计结果表明,微胶囊的反射光谱在1450 nm和1930 nm处呈现与绿色植被相似的水分吸收谷。微胶囊具有优良的水分保持能力,在25℃、相对湿度50%环境中放置96 h后水分含量变化率不超过3%;热重分析和差示扫描量热结果表明,微胶囊水分的流失起始温度超过200℃。该微胶囊轻质、水分含量高、耐热性强,制备工艺简单,与植物叶片近红外反射光谱匹配度高,在对抗高光谱探测技术领域具有良好应用前景。
In order to obtain camouflage materials with near-infrared fine reflection spectral characteristics of plant leaves,interfacial polymerization was used to prepare sorbitol aqueous solution microcapsules.Selecting polyurea as wall material,a two-step temperature programming for the encapsulation process was designed,and sorbitol aqueous solution microcapsules with a moisture content of over 50%were obtained by optimizing reaction temperature.By SEM,it is observed that the microcapsules are spherical with relatively smooth surface.The results of UV-Vis-NIR indicate that the reflection spectra of microcapsules exhibit water absorption valleys similar to those of green vegetation at 1450 nm and 1930 nm.Microcapsules have excellent water retention ability,of which the moisture content hardly changes(within 3%)after being kept for 96 h under the condition of 25℃and 50%relative humidity environment for 96 h.The test results of TGA and DSC indicate that the initial temperature of water loss in microcapsules exceeds 200℃.The microcapsules are lightweight,high in moisture content,and have a strong heat resistance,showing high matching with the near-infrared reflectance spectra of plant leaves.The preparation process is simple.It has good application prospects in the field of anti hyperspectral detection technology.
作者
张艳杰
赵珍
张旭波
娄鸿飞
李巍
周雪琴
Yanjie Zhang;Zhen Zhao;Xubo Zhang;Hongfei Lou;Wei Li;Xueqin Zhou(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300354,China;Collaborative Innovation Center of Chemical Science and Engineering,Tianjin 300072,China;PLA Army Academy of Artillery and Air Defense,Nanjing 210007,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2024年第1期123-130,共8页
Polymer Materials Science & Engineering
关键词
高光谱探测对抗
近红外伪装材料
绿色植被
反射光谱
微胶囊技术
hyperspectral detection countermeasure
near-infrared camouflage material
green vegetation
reflection spectrum
microcapsule technology
