摘要
利用凝胶因子自组装可赋予凝胶网络形状、强度等的特性,设计制备了多面体齐聚倍半硅氧烷(POSS)核有机无机杂化dendrimer(POSS-G1-BOC)凝胶因子并将其引入到液晶客体分子中,获得了兼具力学性能与响应特性的超分子液晶凝胶.在系统研究该液晶凝胶的凝胶行为、响应特性、表面形貌、组装机理及力学性质的基础之上,制备了基于透明柔性可拉伸导电薄膜(PU/Ag NWs)的三明治结构液晶光散射显示器件.该器件在低电压(10 V,DC)驱动下即可实现较高对比度的显示效果,不仅可以在弯曲至曲率为0.14 cm-1的条件下使用,而且在拉伸至原始长度的120%时,仍可保持自身的电控响应特性,有望将其广泛应用于可穿戴设备、智能响应性材料等领域.
POSS core organic-inorganic hybrid dendrimer （POSS-G1-BOC） was successfully designed, synthesized and introduced into LC （liquid crystal） guest molecules （5CB） to prepare supermolecular LC physical gels with strong mechanical strength and new-style stimuli-responsive properties. The highly thermo-stable LC gel could withstand temperature as high as 117 ℃ with the addition of gelators as low as 0.3%. And it had excellent mechanical properties that could maintain its own independent shape within 17% strain even influenced by an external small force. The recover-ability of the LC gel also showed excellent mechanical properties. The microstructure of the system had obvious spiral status and was quite different from previous loofah-like gel networks. LC guest molecules were more likely to influence the self-assembling process of gelators and they were different from the remarkable effect of common solvents. The appearance of spiral fibers in the system without any chiral molecules might indicate the change of self-assembly mechanism in essential. Based on these systematical studies of the LC gel, including its response characteristics, assembly mechanisms and mechanical properties, it was found that the LC gel had many outstanding properties towards light, electric current, magnetic field and heat etc. which could be widely used in the field of display materials, overcoming the natural ＂flowing and orderly＂ properties of liquid crystal molecules. As an example of the application of LC gels, sandwiched LC light scattering display device was prepared based on transparent flexible and stretchable conductive films （PU/AgNWs）. The device could realize the high-constrast display effect driven at a low voltage （10 V, DC） and it could be used under the condition of being bent to the curvature as high as 0.14 cm-1. Meanwhile, it could still keep its electrically controlled response characteristics as being stretched to 120% of its original length. It might be used in the field of wearable devices, sma
作者
童晓茜
单天宇
马猛
陈思
王旭
Xiao-qian Tong Tian-yu Shan Meng Ma Si Chen Xu Wang(College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2017年第10期1652-1661,共10页
Acta Polymerica Sinica
