In this study, a new method to prepare the chiral polymer/cholesteric liquid crystals composite films with broadband reflective capability was reported. A negative dielectric anisotropy liquid crystal material was utilized as the mesogenic solvents and a chiral mesogenic monomer was employed as the chiral dopant. The chiral mesogenic monomer not only induced the liquid crystal molecules to align to form the helical structure, but also as the polymerizable monomer to be crosslinked under UV light to stabilize the pitch gradient in the materials. The UV absorbing dye was used to generate the intensity gradient of UV light and promoted the diffusion of the chiral mesogenic monomer from the backlight side to the light side. The effect of the content of the chiral mesogenic monomer and the intensity of the UV light applied during the preparation process of the composite film on the broadband reflective capability was studied systematically. The chiral polymer/cholesteric liquid crystals composite film that can reflect the light covering the wavelength from 820 nm to 2100 nm was achieved successfully and was used as the functional film in the windows for shielding part of near-infrared light to achieve the thermal management effect of buildings. This work is expected to provide a new method for the preparation of smart windows and thermal management of buildings.

在这项研究中，报道了一种制备具有宽带反射能力的手性聚合物/胆甾型液晶复合薄膜的新方法。负介电各向异性液晶材料用作介晶溶剂，手性介晶单体用作手性掺杂剂。手性介晶单体不仅诱导液晶分子排列形成螺旋结构，而且作为可聚合单体在紫外光下交联以稳定材料中的螺距梯度。UV吸收染料用于产生UV光的强度梯度并促进手性介晶单体从背光侧向光侧的扩散。系统研究了手性介晶单体的含量和复合膜制备过程中施加的紫外光强度对宽带反射能力的影响。手性聚合物/胆甾醇型液晶复合膜可反射820～2100nm波长范围的光，成功实现，并作为窗户中的功能膜，屏蔽部分近红外光，达到热管理效果的建筑物。这项工作有望为智能窗的制备和建筑物的热管理提供一种新的方法。手性聚合物/胆甾型液晶复合膜可反射820-2100nm波长范围的光，成功实现，作为窗户的功能膜，屏蔽部分近红外光，达到热管理效果的建筑物。这项工作有望为智能窗的制备和建筑物的热管理提供一种新的方法。手性聚合物/胆甾醇型液晶复合膜可反射820～2100nm波长范围的光，成功实现，并作为窗户中的功能膜，屏蔽部分近红外光，达到热管理效果的建筑物。这项工作有望为智能窗的制备和建筑物的热管理提供一种新的方法。