无色透明高性能固有抗紫外线聚氨酯及其抗紫外线机理,ACS Applied Materials & Interfaces

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无色透明高性能固有抗紫外线聚氨酯及其抗紫外线机理
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-03-29 , DOI: 10.1021/acsami.2c23317
Gaoshang Huang ₁ , Chenxin Yao ₁ , Miaoming Huang ₁ , Junjie Zhou ₁ , Xiuge Hao ₂ , Xiaojuan Ma ₁ , Suqin He ₁ , Hao Liu ₁ , Wentao Liu ₁ , Chengshen Zhu ₁

Affiliation

聚氨酯 (PU) 是一种广泛使用的高分子材料，长时间暴露在紫外线 (UV) 下会老化，从而缩短使用寿命。已经使用多种方法制备抗紫外线 PU，包括添加非反应性抗紫外线添加剂、功能性填料和生物抗氧化分子。然而，非反应性抗紫外线添加剂在长期使用过程中可能会发生迁移，功能性填料可能会破坏力学性能并严重降低样品的透光率，生物抗氧化分子不可避免地会使样品着色。为了解决这些问题，在这项工作中，通过原位聚合将苯并三唑紫外线吸收剂（Chiguard R-455）引入聚氨酯分子链中，制备了具有高性能和无色透明的非迁移本征抗紫外线聚氨酯样品。抗紫外线 PU 样品在可见光范围内表现出超过 88% 的透光率和优异的机械性能，拉伸强度高于 65 MPa，断裂伸长率高于 900%。经过 24 小时的紫外线照射（200 W，365 nm），纯 PU 样品的拉伸强度和断裂伸长率显着降低，分别仅为原始样品的 8.9% 和 15.8%。相反，Chiguard R-455的加入会赋予PU样品优异的抗紫外线性能。经24 h紫外线照射后，PU-0.5%（Chiguard R-455含量仅为0.5 wt%）的拉伸强度（67.2±1.6 MPa）和断裂伸长率（917.4±30.0%）与未经辐照的样品 (67.4 ± 3.5 MPa 和 919.4 ± 26.5%)。此外，系统地研究了 PU 样品的抗紫外线机制。

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Colorless, Transparent, and High-Performance Polyurethane with Intrinsic Ultraviolet Resistance and Its Anti-UV Mechanism

Polyurethane (PU) is a widely used polymer material that will age under prolonged exposure to ultraviolet (UV) light, shortening the service life. Several methods have been used to prepare the anti-UV PU, including adding nonreactive anti-UV additives, functional fillers, and biological antioxidant molecules. However, the nonreactive anti-UV additives may migrate during long-term use, the functional fillers may damage the mechanical properties and seriously reduce the light transmittance of the sample, and the biological antioxidant molecules will inevitably color the sample. To solve these problems, in this work, a benzotriazole UV absorber (Chiguard R-455) was introduced into the PU molecular chains by in situ polymerization to prepare the nonmigrating intrinsic anti-UV PU sample with high performance and colorless transparency. The anti-UV PU samples exhibit light transmittance of over 88% in the visible range and superior mechanical properties with tensile strength higher than 65 MPa and elongation at break higher than 900%. After 24 h UV irradiation (200 W, 365 nm), the tensile strength and elongation at break of pure PU sample are significantly reduced to only 8.9 and 15.8% of the original one, respectively. On the contrary, the addition of Chiguard R-455 will endow the PU sample with excellent anti-UV performance. After 24 h UV irradiation, the tensile strength (67.2 ± 1.6 MPa) and elongation at break (917.4 ± 30.0%) of PU-0.5% (the content of Chiguard R-455 is only 0.5 wt %) have changed little compared with the sample without irradiation (67.4 ± 3.5 MPa and 919.4 ± 26.5%). Additionally, the anti-UV mechanism of the PU sample is systematically studied. This work provides a feasible method for preparing colorless, transparent, high-performance, nonmigrating intrinsic UV-shielding PU samples, which can be used as a UV light-shielding material in various fields with visible and aesthetic requirements, such as protection fields and wearable products.

更新日期：2023-03-29

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