Nanoparticle layer via UV-induced directional migration of iron-doped titania nanoparticles in polyvinyl butyral films and superior UV-stability
Nanoparticle layer via UV-induced directional migration of iron-doped titania nanoparticles in polyvinyl butyral films and superior UV-stability
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DOI：
10.1016/j.polymer.2022.125107
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发表时间：
2022-06-29
期刊：
影响因子：
4.6
通讯作者：
Yang, Mingshu
中科院分区：
文献类型：
--
作者：
Luo, Fushuai;Chen, Zheming;Yang, Mingshu
纳米粒子在聚合物基体中的迁移对聚合物纳米复合材料的结构和性能具有重要意义。然而，理解和控制纳米粒子在聚合物基体中的迁移仍然是一个挑战。在此，我们报告使用紫外（UV）光来执行聚合物膜中的无机纳米粒子的定向迁移，在膜的曝光表面上产生纳米（100-200 nm）的纳米粒子层。制备的铁掺杂二氧化钛纳米粒子（Fe-TiO 2）最初均匀分散在聚乙烯醇缩丁醛（PVB）薄膜中，即使经过热处理，均匀分布也保持不变。然而，UV照射诱导纳米颗粒朝向被照射表面的定向迁移。其机理表明，纳米粒子的定向迁移与紫外光照射下Fe-TiO 2与PVB之间界面能的增加和构象熵效应有关。所形成的纳米颗粒层赋予PVB/Fe-TiO 2薄膜以上级紫外稳定性。我们的工作扩展了通过施加外部刺激来控制纳米颗粒在聚合物基体中迁移的研究，并为聚合物纳米复合材料的功能化提供了一种新的策略。
The migration of nanoparticles in polymer matrix is significant for the structure and performance of polymer nanocomposites after the initial formation. However, the understanding and controlling of migration of nano particles in polymer matrix remains a challenge. Herein, we report using ultraviolet (UV) light to perform the directional migration of inorganic nanoparticles in polymer film, generating an ultrathin (100-200 nm) nano particle layer on the light exposure surface of the film. The prepared iron-doped titania nanoparticles (Fe-TiO2) are initially uniformly dispersed into polyvinyl butyral (PVB) film, and homogeneous distribution remains unchanged even after thermal treatment. However, the UV irradiation induces the directional migration of nano particles towards the illuminated surface. The mechanism indicates that the directional migration of nanoparticles is related with the increase of interfacial energy and conformational entropic effect between Fe-TiO2 and PVB upon UV irradiation. The formed nanoparticle layer endowed the PVB/Fe-TiO2 film with superior UV-stability. Our work extends the study of controlling migration of nanoparticles in polymer matrix by applying external stimuli, and provides a novel strategy for the functionalization of polymer nanocomposite materials.