私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯系方式
  • 通信地址:四川省成都市武侯區一環路南一段24號
  • 郵編:610065
  • 電話:02885401152
  • 傳真:
  • Email:liangjiang@scu.edu.cn
當前位置:> 首頁 > 論文著作 > 正文
Simultaneously self-healing and photoluminescence waterborne polyurethane coatings based on dual dynamic bonds
作者:Yuan Lei, Bo Wu, Anqian Yuan, Xiaowei Fu, Liang Jiang *, Jingxin Lei *
關鍵字:Waterborne polyurethane, Carbon quantum dots, Coatings, Self-healing, Photoluminescence.
論文來源:期刊
發表時間:2021年
Waterborne polyurethane coatings capable of excellent transparency, solvent resistance and hardness, have been widely used in furniture, leather and other industries. However, waterborne polyurethane used as coatings may be inevitably damaged during long-term use, which has bad effect on their service life. Therefore, it is of great significance to prepare self-healable waterborne polyurethane coatings with high strength, as well as other new functions. In this work, a class of carboxyl-type waterborne polyurethanes (CWPU) was facilely prepared. The average hydrodynamic diameter size and dispersion index of the prepared CWPU were 56 nm and 0.219, showing uniform size distribution and stable emulsification system. The key point of this work is using polymine (PEI), whose molecular structure containing primary amine and secondary amine can form ionic bonds and hydrogen bonds with CWPU. PEI can be introduced as crosslinking agent to prepare cross-linked CWPU (WPUs). The tensile strength and the elongation at break of WPUs can arrive at 17.12 MPa and 512.25%. After selfhealing at 30 ?C for 24 h, the tensile strength and elongation at break of the WPUs can reach 3.26 MPa and 450.94%, respectively. Importantly, these synthesized WPUs not only have outstanding mechanical properties, but also exhibit excellent self-healing performance. Additionally, as for coatings, the visible light transmittance of prepared WPUs coatings is all higher than 75%, showing excellent optical properties. Especially, incorporating carbon quantum dots (CQs) can endow these prepared WPUs with obvious photoluminescence performance. The aforementioned functions of self-healing and photoluminescence performance have expanded the service life and application of WPUs coatings. This kind of coatings is expected to be used in plexiglass protective coating, light emitting diode, road signs, optical anti-counterfeiting and other fields.
主站蜘蛛池模板: 重庆市| 白银市| 罗源县| 抚远县| 尚志市| 长治市| 延津县| 松桃| 象山县| 勐海县| 侯马市| 汝阳县| 邢台县| 秀山| 扎兰屯市| 宜宾市| 天津市| 新化县| 施甸县| 温宿县| 北辰区| 乌什县| 宜宾县| 汨罗市| 灵山县| 连州市| 清远市| 宣城市| 黎川县| 文成县| 凤山市| 康乐县| 榕江县| 达州市| 监利县| 伊川县| 辛集市| 梧州市| 松原市| 香港 | 什邡市|