Balance working temperature and viewing angle properties in polymer dispersed liquid crystal film via SiO2

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing Pub Date : 2025-04-08 DOI:10.1016/j.compositesa.2025.108937

Tao Yu , Jianjun Xu , Jianjun Chen , Jianxin Liu , Yanzi Gao

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Abstract

The application of polymer dispersed liquid crystal (PDLC) film has been significantly hindered due to its unsatisfactory contrast ratio (CR) in high-temperature environments, delayed response speed in low-temperature conditions, and suboptimal off-axis viewing angles. To address these issues, nano-particle SiO₂ with a similar refractive index to polymer was introduced into the film, and then the electro-optical properties and viewing angle characteristics of PDLC films with different contents of SiO₂ at 100 °C and −30 °C were analyzed. When the doping amount of SiO₂ is 1.5 wt% of the polymer component, the contrast ratio of PDLC films at 100 °C is increased to 16, which is 60 % higher than that of undoped SiO₂ films. At −30 °C, the saturation voltage is 59 V (2.95 V/μm), and the rise time and decay time are 0.35 s and 2.5 s, respectively, slightly higher than the film without doping SiO₂. The film also maintained a good viewing angle, with H_on < 15 % at 45° and T_on > 60 % at 60°. Balancing the film’s viewing angle and working temperature is anticipated to enhance its applicability for outdoor smart windows.

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通过SiO2平衡聚合物分散液晶膜的工作温度和视角性能

聚合物分散液晶（PDLC）薄膜在高温环境下的对比度（CR）不尽人意，在低温条件下反应速度迟缓，离轴视角不理想，这些问题严重阻碍了其应用。为了解决这些问题，我们在薄膜中引入了折射率与聚合物相近的纳米二氧化硅，然后分析了不同二氧化硅含量的 PDLC 薄膜在 100 ℃ 和 -30 ℃ 下的电光性能和视角特性。当 SiO2 的掺杂量为聚合物成分的 1.5 wt% 时，100 ℃ 时 PDLC 薄膜的对比度增加到 16，比未掺杂 SiO2 的薄膜高 60%。在 -30 °C 时，饱和电压为 59 V（2.95 V/μm），上升时间和衰减时间分别为 0.35 s 和 2.5 s，略高于未掺杂 SiO2 的薄膜。该薄膜还保持了良好的视角，在 45° 时，Hon < 15 %，在 60° 时，Ton > 60 %。平衡薄膜的视角和工作温度有望提高其在户外智能窗户中的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composites Part A: Applied Science and Manufacturing 工程技术-材料科学：复合

CiteScore

15.20

自引率

5.70%

发文量

492

审稿时长

30 days

期刊介绍： Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.