摘要
本文创新性地将POSS核树枝状凝胶因子(POSS-G1-BOC)加入基体液晶分子5CB中,并且将偶氮苯化合物(Azo)作为光响应剂掺杂至该体系中制备得到液晶物理凝胶。通过管反演法、DSC、旋转流变仪等方法研究液晶物理凝胶的凝胶行为。采用SEM、紫外分光光度计、雾度仪等手段研究液晶物理凝胶的表观形貌、紫外吸收、透光率等。研究结果表明:在凝胶因子含量仅为0.5wt%即可形成凝胶强度良好的液晶物理凝胶,且此时体系溶胶-凝胶温度可达到111℃,远高于基体液晶的相转变温度35℃,具有良好的热稳定性。由于体系中偶氮苯光响应剂的存在,使得其对365nm紫外光及455nm蓝光也具有可逆的响应行为。本文成功地制备了具有光、热双控性质的液晶物理凝胶,为其在防伪商标、食品包装材料、光热传感器、生物医用材料等领域的应用提供了可能。
Nobel kind of POSS core dendritic gelator（POSS-G1-BOC）was added into liquid crystal（5CB）with 5wt% light response azobenzene dopant（Azo）to prepare liquid crystalline physical gel.The gelation behavior of the liquid crystal physical gel was characterized by tube inversion,DSC,rotary rheometer etc. The surface morphology, UV absorption and transmittance were investigated using SEM, UV spectrophotometer and haze meter,separately.The results show that the liquid crystalline physical gel with high strength can be obtained with the gelator concentration as low as 0.5wt%.The sol-gel temperature reached 111℃ during the sol-gel process,which is much higher than the phase transition temperature（35℃）of liquid crystal matrix,indicating the result gel has a good thermal stability.Due to the light response ability of Azo,the properties of the gel could also be reversibly controlled through changing the wavelength of the incident beam from 365 nm to 455 nm.The obtained liquid crystal physical gel sensible to both light and heat may provide possible application in the field of anti-counterfeiting trademarks,food packaging materials,thermal sensor,biological and medical materials etc.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2015年第5期685-691,共7页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(51173167
21004052)
浙江省自然科学基金资助项目(LY14E030003
LY14E030004)
作者简介
罗骁（1990-），硕士研究生，研究方向：液晶物理凝胶。E-mail：lx0129hz@163．com。
通讯作者：王旭，教授。E-mail：wangxu@zjut．edu．cn。
