金斌 张鹏 夏剑辉



摘要:以丙烯酸丁酯 (BA)、丙烯酸异辛酯 (EHA)、丙烯酸羟乙酯 (HEA)为单体,通过自由基溶液聚合,制备了BA/HEA、EHA/HEA以及BA/EHA/HEA 3种光学透明粘弹体 (CVF)。探究不同丙烯酸酯单体对CVF的流变性能、力学性能和光学性能的影响。结果表明:BA/EHA/HEA组综合性能最佳,其玻璃化转变温度为-52~-50 ℃,剥离力为10.693 N,应力松弛率为58%,应变回复率为91.1%,透光率为94.1%,雾度为0.26%。
关键词:柔性显示;丙烯酸酯;光学透明粘弹体;流变性能
中图分类号:TQ317
文献标识码:A文章编号:1001-5922(2022)06-0001-06
Study on acrylate clear viscoelastic film for flexible display
JIN Bin ZHANG Peng XIA Jianhui
(
1. South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South
China University of Technology, Guangzhou 510640, China; 2. Guangdong Provincial Key Laboratory of Functional
and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou 510640, China
)
Abstract: Three kinds of BA/HEA, EHA/HEA and BA/EHA/HEA clear viscoelastic film (CVF) were prepared by radical solution polymerization using butyl acrylate (BA), 2-ethylhexyl acrylate (EHA) and hydroxyethyl acrylate (HEA) as monomers. The effects of different acrylate monomers on the rheological, mechanical and optical properties were studied. The results show that BA/EHA/HEA had the best overall performance. Its glass transition temperature was -52~-50 ℃, peel strength was 10.693 N, stress relaxation was 58% and strain recovery was 91.1%, light transmittance was 94.1%, and haze was 0.26%.
Key words:flexible display; acrylate;clear viscoelastic film; rheological properties
光学透明粘弹体(CVF)是一种与光学零件的光学性能相近,并具有优良粘接性能的高分子材料[1]。基于丙烯酸酯聚合物的CVF具有润湿性好、干燥快、初粘力大且耐水性佳等优点,现已广泛应用于胶带、压敏标签等领域;又因其优异的光学性能、良好的粘接性能以及持久的耐老化性能,广泛应用于智能手机、平板电脑等消费电子领域。CVF是若干种丙烯酸酯单体或添加一定比例的其他乙烯基类单体,经自由基聚合得到的聚合物。根据对聚合物性能的贡献,将不同的反应物分为软单体、硬单体和功能单体。软单体可降低CVF的玻璃化转变温度 (Tg);[JP2]而硬单体玻璃化转变温度较高且可增强其内部强度[11],功能性单体可通过提供交联结合位点[12]等途径提升其性能。因此可以通过选择不同丙烯酸酯单体得到不同性能的丙烯酸酯聚合物的CVF。
本实验以丙烯酸丁酯 (BA)、丙烯酸異辛酯 (EHA)、丙烯酸羟乙酯 (HEA)为主要实验原料,偶氮二异戊腈为引发剂,乙酸乙酯和丁酮为溶剂,采用自由基溶液聚合制备了BA/HEA、EHA/HEA以及BA/EHA/HEA 3种光学透明粘弹体。……