摘要
为开发一种兼具水响应性变色与可靠化学防护性能的先进材料,构建了聚乙烯醇(PVA)/纤维素纳米晶体(CNC)/共价有机骨架材料(COFs)复合膜。系统探究了复合膜浸水前后的力学性能、光学特性、水接触角、水蒸气透过系数及化学稳定性,并用傅里叶红外光谱揭示了其水致变色的微观机制。结果表明:COFs的引入赋予了复合膜显著的水响应性变色行为,ΔE达到21.24,其机制源于水分子与COFs亚胺键的n-π相互作用及体系氢键网络重组。浸水后风干膜发生溶胀软化,浸水前其水蒸气透过系数为1.016×10^(-12) g/(cm·s·Pa),浸水后为1.187×10^(-12) g/(cm·s·Pa)。复合膜在多数有机溶剂中展现出了良好的化学稳定性,且气体阻隔性能远优于常规聚合物膜。认为:制备的复合膜具有水致变色行为,同时兼顾化学防护所需的机械强度与化学稳定性,在智能化学防护领域应用前景广阔。
To develop an advanced material integrated both water-induced color change and reliable chemical protection performance,composite film comprising polyvinyl alcohol(PVA),cellulose nanocrystals(CNC)and covalent organic framework(COFs)was constructed.The mechanical property,optical characteristic,water contact angle,water vapor transmission coefficient,and chemical stability of the composite film before and after water immersion were systematically investigated.Furthermore,the microscopic mechanism underlying its water-induced color change was revealed by Fourier-transform infrared spectroscopy.The result showed that the incorporation of COFs endowed the composite film significant water-responsive hydrochromic behavior,ΔE value was reached 21.24.The mechanism was attributed to the n—πinteraction between water molecules and the imine bonds within the COFs,coupled with a reorganization of the hydrogen-bonding network in the system.After water immersion and subsequent air-drying,the composite film was observed to swell and soften.Its water vapor permeability coefficient was measured to be 1.016×10^(-12) g/(cm·s·Pa)before immersion and 1.187×10^(-12) g/(cm·s·Pa)after immersion.The composite film maintained better chemical stability in most organic solvents,its gas barrier performance was demonstrated to be far superior to that of conventional polymer films.It is considered that the composite film not only exhibited hydrochromic behavior,but also balanced the mechanical strength and chemical stability required for chemical protection applications,had broad application prospects in the field of intelligent chemical protection.
作者
段志漩
李君美
贺佩芝
沈华
阳玉球
钱彬
刘丽芳
DUAN Zhixuan;LI Junmei;HE Peizhi;SHEN Hua;YANG Yuqiu;QIAN Bin;LIU Lifang(Donghua University,Shanghai,201620,China;Yuyue Home Textile Co.,Ltd.,Binzhou,256623,China)
出处
《棉纺织技术》
2026年第2期53-59,共7页
Cotton Textile Technology
基金
国家重点研发计划项目(2023YFC3011603)
山东省泰山产业创新领军人才项目(TSCX202306163)。
