表面改性纳米SiO2掺杂对无色聚酰亚胺薄膜性能的影响
PDF下载 (113)罗亚琨,金群超,严新稳,罗云杰.表面改性纳米SiO2掺杂对无色聚酰亚胺薄膜性能的影响[J].宁波大学学报(理工版),2025,38(6):67-76.DOI:10.20098/j.cnki.1001-5132.2025.0511
LUO Yakun,JIN Qunchao,YAN Xinwen,LUO Yunjie.Effect of surface modified nano-SiO2 doping on the properties of colorless polyimide films[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(6):67-76.DOI:10.20098/j.cnki.1001-5132.2025.0511
| Title: | Effect of surface modified nano-SiO2 doping on the properties of colorless polyimide films |
| 作者: | 罗亚琨, 金群超, 严新稳, 罗云杰 |
| Author(s): | LUO Yakun, JIN Qunchao, YAN Xinwen, LUO Yunjie |
| 关键词: | 无色聚酰亚胺; 柔性显示; 纳米二氧化硅; 表面修饰; 表面硬度 |
| Keywords: | colorless polyimide (CPI); flexible display; nano-SiO2; surface modification; surface hardness |
| 分类号: | O633.5 |
| DOI: | 10.20098/j.cnki.1001-5132.2025.0511 |
| 文献标识码: | A |
| 摘要: | 作为可折叠显示器中柔性盖板的关键材料，无色聚酰亚胺（CPI）薄膜须同时具备较高的表面硬度、良好的光学透明度和柔韧性。当CPI薄膜的表面硬度不足时，通过传统的硬化涂层处理提高表面硬度的方法会面临较大局限。利用CPI掺杂纳米SiO2粒子来提升复合薄膜的表面硬度，纳米SiO2粒子的表面依次用硅氧烷偶联剂和聚酰胺酸低聚物接枝处理，使其在复合薄膜中均匀分散，在提高CPI薄膜表面硬度的同时保持良好的透明度和柔韧性。未掺杂的CPI薄膜表面铅笔硬度为B，掺杂质量分数为30%的纳米SiO2粒子后，CPI-1/SiO2复合薄膜的表面铅笔硬度显著提升至2H。添加纳米SiO2粒子几乎不影响复合薄膜的透明度和雾度，但会降低薄膜的抗拉强度和断裂伸长率。随着纳米SiO2粒子质量分数的增加，复合薄膜的黄度有一定程度上升，所有复合薄膜均表现出优异的柔韧性。 |
| Abstract: | As critical flexible window-covering materials for foldable displays, colorless polyimide (CPI) films require enhanced surface hardness while maintaining optical clarity and flexibility. Traditional hard coating methods face limitations when the base film hardness is insufficient. In this paper, we developed a surface-modified nano-SiO2 doping strategy to address nanoparticle aggregation. Siloxane coupling agents and oligomer grafting ensured uniform dispersion, enabling simultaneous hardness enhancement and transparency retention. The pristine CPI films exhibited a surface pencil hardness of B. Upon doping with 30% nano-SiO2 particles, the pencil hardness of the CPI-1 composite film increased to 2H, while those of CPI-2 and CPI-3 composite films reached H. However, the addition of nano-SiO2 particles compromised the tensile strength as well as the elongation at break of the films. The optical transparency and haze factor remained largely unaffected, but the yellowness index increased significantly with higher nano-SiO2 content. All composite films demonstrated excellent flexibility. |
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| 备注/Memo: | 收稿日期：2025−05−15 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ 基金项目：国家自然科学基金（21971130）；宁波市自然科学基金（2024Z080） 第一作者：罗亚琨，硕士研究生，主要研究方向为聚酰亚胺材料的设计合成。E-mail: 3078792897@qq.com *通信作者：罗云杰，博士/教授，主要研究方向为高分子合成化学。E-mail: luoyunjie@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
