Responsive Smart Windows Enabled by the Azobenzene Copolymer Brush with Photothermal Effect,ACS Applied Materials & Interfaces

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Responsive Smart Windows Enabled by the Azobenzene Copolymer Brush with Photothermal Effect
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-09-30 , DOI: 10.1021/acsami.9b10286
Ze-Yang Kuang ₁ , Yuan Deng ₁ , Jun Hu ₁ , Lei Tao ₁ , Ping Wang ₁ , Jian Chen ₂ , He-Lou Xie _{1,

2}

Affiliation

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.

中文翻译：

偶氮苯共聚物刷具有光热效应的响应式智能Windows

通过使单体丙烯酸6-（4-（（4-丁苯基）二氮烯基）苯氧基）甲基丙烯酸己酯（MAzo）与甲基丙烯酸缩水甘油酯（GMA）共聚，成功合成了偶氮苯侧链液晶共聚物（MAzo- co -GMA）。得到的MAzo-合作-GMA共聚物可在热退火后在表面形成稳定的聚合物刷。所获得的聚合物刷不仅引起液晶的取向，而且由于偶氮苯侧基而在紫外光照射下显示出光热效应。根据这些结果，以该聚合物刷为基底的LC液晶盒还可以用来制造聚合物稳定的液晶（PSLC）智能窗口。所得的PSLC智能窗口显示透明状态，因为PSLC的SmA *相中的垂直排列是由LC单元表面上的聚合物刷引起的。不透明状态可以通过UV光照射或加热在散射N *相中实现。所述PSLC智能窗的响应时间可以通过调节MAzo-的浓度来调节共-GMA共聚物刷和紫外线强度。这种同时具有热响应和紫外线响应的PSLC智能窗具有良好的可逆性和稳定性，在节能设备中具有广阔的应用前景。

更新日期：2019-09-30

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