Responsive Smart Windows Enabled by the Azobenzene Copolymer Brush with Photothermal Effect
Responsive Smart Windows Enabled by the Azobenzene Copolymer Brush with Photothermal Effect
复制标题
具有光热效应的偶氮苯共聚物刷实现响应式智能窗户
DOI：
10.1021/acsami.9b10286
复制
发表时间：
2019-10-09
影响因子：
9.5
通讯作者：
Xie, He-Lou
中科院分区：
文献类型：
--
作者：
Kuang, Ze-Yang;Deng, Yuan;Xie, He-Lou
以甲基丙烯酸缩水甘油酯（GMA）和甲基丙烯酸6-（4-（（4-丁基苯基）-二氮烯基）苯氧基）己酯（马佐）为单体合成了偶氮苯侧链液晶共聚物（MAzo-co-GMA）。所得MAzo-co-GMA共聚物在热退火后可在表面形成稳定的聚合物刷。所得到的聚合物刷不仅诱导液晶的取向，而且由于偶氮苯侧基在紫外光照射下显示光热效应。在此基础上，进一步利用这种聚合物刷作为基底的液晶盒制作了聚合物稳定液晶（PSLC）智能窗。所得PSLC智能窗显示透明状态，因为PSLC的SmA* 相中的垂面配向由LC单元表面上的聚合物刷诱导。不透明状态可以通过UV光照射或加热在散射N* 相中实现。PSLC智能窗的响应时间可以通过调节MAzo-co-GMA共聚物刷的浓度和UV光的强度来调节。这种具有热响应和紫外响应的PSLC智能窗具有良好的可逆性和稳定性，在节能器件中具有广阔的应用前景。
An azobenzene side chain liquid crystalline copolymer (MAzo-co-GMA) is successfully synthesized through copolymerizing the monomer 6-(4-((4-butylphenyl)-diazenyl)phenoxy)hexyl methacrylate (MAzo) with glycidyl methacrylate (GMA). The obtained MAzo-co-GMA copolymer can form stabilized polymer brush on the surface after thermal annealing. The obtained polymer brush not only induces the alignment of liquid crystals but also shows a photothermal effect under UV light irradiation due to the azobenzene side group. On basis of these results, the LC cell with this polymer brush as the substrate is further used to fabricate the polymer-stabilized liquid crystal (PSLC) smart window. The resultant PSLC smart window shows the transparent state because the homeotropic alignment in the SmA* phase of PSLC is induced by the polymer brush on the surface of the LC cell. The opaque state can be achieved in the scattering N* phase by UV light irradiation or heating. The response time of the PSLC smart window can be regulated by adjusting the concentration of MAzo-co-GMA copolymer brush and the intensity of UV light. This kind of PSLC smart window with both thermal and UV response shows good reversibility and stability, which endows enormous promising applications in energy-saving devices.