Engineering highly transparent UV-shielding films with disassembled polydopamine oligomers as light adsorber
Engineering highly transparent UV-shielding films with disassembled polydopamine oligomers as light adsorber
复制标题
用分解的聚多巴胺低聚物作为光吸收剂设计高透明的紫外线屏蔽薄膜
DOI：
10.1016/j.apsusc.2021.149284
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发表时间：
2021-02-27
影响因子：
6.7
通讯作者：
Zhu, Liping
中科院分区：
文献类型：
--
作者：
Lu, Jingyu;Fang, Jinchao;Zhu, Liping
在这项研究中，一个高度透明的紫外线（UV）屏蔽膜的制备通过开发拆卸聚多巴胺（dPDA）低聚物作为活性紫外线吸收剂，然后通过溶剂浇铸法纳入到基体的聚乙烯醇（PVA）。结果表明，仅添加0.5wt%的dPDA的复合膜可以阻挡99.3%的紫外光（波长为200？400 nm），而不损害膜的透明度。这种优异的紫外线屏蔽能力归因于dPDA低聚物中有限的分子间和分子内共轭，其可以很好地分散在PVA基质中。此外，dPDA中分子共轭作用的减弱导致了紫外光谱的明显蓝移。维斯吸光度，因此在UV区域有强吸光度，但在可见光区域有高透射率。此外，dPDA/PVA复合膜的光稳定性优于PDA/ PVA复合膜，这是由于dPDA中不存在自由基，有利于避免在紫外光照射下长期使用时的光老化。这项工作证明了dPDA低聚物作为高效光吸收剂用于紫外屏蔽膜的可行性，并提供了一些新的见解，以克服透明度和紫外屏蔽之间的权衡效应，制备高性能的紫外屏蔽膜。
In this study, a highly transparent ultraviolet (UV)-shielding film was prepared by developing disassembled polydopamine (dPDA) oligomers as active UV light absorbers, followed by the incorporation into the matrix of polyvinyl alcohol (PVA) via a solvent casting method. It was shown the composite film with only 0.5 wt% of dPDA addition could barrier 99.3% of UV light (wavelength of 200?400 nm), without compromising the film transparency. Such excellent UV-shielding ability was attributed to the limited inter- and intra-molecular conjugations in dPDA oligomers which can be well dispersed in PVA matrix. Besides, the weakened molecular conjugations in dPDA led to obvious blue-shift of UV?vis absorbance, and thus strong absorbance in UV region but high transmittance in visible region. Moreover, the dPDA/PVA films exhibit higher photostability than PDA/ PVA ones due to the absence of free radicals in dPDA, which was advantageous to avoid the photoaging in the long-term use under UV irradiation. This work proves the feasibility of dPDA oligomers as highly efficient light absorbers used for UV-shielding films and provides some new insights to overcome the trade-off effect between transparency and UV-shielding for preparing high-performance UV-shielding films.