A self-colored waterborne polyurethane film with natural curcumin as a chain extender and excellent UV-Absorbing properties
A self-colored waterborne polyurethane film with natural curcumin as a chain extender and excellent UV-Absorbing properties
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以天然姜黄素为扩链剂的自着色水性聚氨酯薄膜，具有优异的紫外线吸收性能
DOI：
10.1016/j.polymer.2021.124465
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发表时间：
2021-12
期刊：
影响因子：
4.6
通讯作者：
Houbin Li
中科院分区：
文献类型：
--
作者：
Tao Zhang;Yajun Deng;Wenshuo Zhang;Guannan Wang;Yuye Zhong;Cheng Su;Houbin Li
为了顺应可持续发展的趋势，自然资源已经吸引了各种应用中的功能材料的制备。以天然色素姜黄素为扩链剂，合成了一系列环保型水性聚氨酯，制备了具有优异紫外线吸收性能的自着色水性聚氨酯薄膜。从透明性、热稳定性和力学性能等方面考察了姜黄素含量对水性聚氨酯涂膜性能的影响。采用傅里叶变换红外光谱（FT-IR）、凝胶渗透色谱（GPC）和核磁共振氢谱（1H NMR）对水性聚氨酯的化学结构进行了系统表征。不含姜黄素的WPU-0薄膜的透光率为89.27%，其中WPU-1、WPU-2和WPU-3薄膜的透光率随姜黄素含量的增加分别降低到87.69%、84.38%和76.89%，对UVA（315-400 nm）和UVB（280-315 nm）的吸收接近100%。热重分析（TGA-DTG）曲线表明，姜黄素的引入可以有效地提高不同薄膜的热稳定性。此外，对四种水性聚氨酯薄膜进行了拉伸应力-应变测量，以研究其力学性能。当添加6%姜黄素扩链剂时，WPU-1膜的应力增加到28.73 MPa，而对照样品WPU-0的应力值仅为12.45 MPa。当姜黄素含量分别为12%和18%时，WPU-2和WPU-3薄膜的应力逐渐降低，分别为20.18 MPa和11.48 MPa。另外，随着姜黄素含量增加18%，材料的断裂伸长率逐渐降低，从WPU-0的555%急剧下降到WPU-3的233%，表明姜黄素水性聚氨酯的脆性增加。结果表明，天然绿色姜黄素被引入到水性聚氨酯的结构中，可获得力学性能和透明性均较好的环保型水性聚氨酯薄膜，且具有自身的颜色。
To follow the sustainable tendency, natural resources have been attractive to fabricate the functional materials in various applications. In this present study, curcumin, a natural pigment, was used as a chain extender to synthesize a series of environmentally friendly waterborne polyurethane to prepare self-colored waterborne polyurethane films with excellent ultraviolet (UV) absorption properties. The effect of curcumin content on the performance of waterborne polyurethane film was investigated from the aspects of transparency, thermal stability and mechanical properties. The chemical structure of waterborne polyurethane was systematically characterized by Fourier transform infrared (FT-IR), gel permeation chromatography (GPC) and1H nuclear magnetic resonance (1H NMR) spectrums. The transmittance of the WPU-0 without curcumin as control sample was 89.27%, in which the films WPU-1, WPU-2 and WPU-3 respectively decreased the transmittance to 87.69%, 84.38% and 76.89%, and absorbs nearly 100% in UVA (315–400 nm) and UVB (280–315 nm) radiations with increasing of the curcumin content. The thermogravimetric analysis (TGA-DTG) curves showed that the introduction of curcumin could effectively improve the thermal stability of different films. Besides, four waterborne polyurethane films were carried out the tensile stress-strain measurement to investigate the mechanical properties. When adding 6% curcumin chain extender, the stress of WPU-1 film increased to 28.73 MPa relative to the control sample WPU-0 which of the value was only 12.45 MPa. Beyond expectation, while adding 12% and 18% curcumin content, the stress of WPU-2 and WPU-3 films gradually decreased to 20.18 MPa and 11.48 MPa, respectively. In addition, as increasing 18% proportion of curcumin, the elongation at break gradually decreased, specifically, the value at 555% of the WPU-0 sharply reduced to 233% of the WPU-3, indicating that the brittleness of the curcumin-based waterborne polyurethane was increased. The results showed that the naturally green curcumin was incorporated into the waterborne polyurethane structure, and an environmentally-friendly waterborne polyurethane film with good mechanical properties and transparency could been obtained with its own color.
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