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Highly Transparent, Strong, and Flexible Films with Modified Cellulose Nanofiber Bearing UV Shielding Property
Biomacromolecules ( IF 5.5 ) Pub Date : 2018-11-09 00:00:00 , DOI: 10.1021/acs.biomac.8b01252 Xun Niu 1 , Yating Liu 1 , Guigan Fang 2, 3 , Chaobo Huang 1, 2 , Orlando J. Rojas 4 , Hui Pan 1, 2
Biomacromolecules ( IF 5.5 ) Pub Date : 2018-11-09 00:00:00 , DOI: 10.1021/acs.biomac.8b01252 Xun Niu 1 , Yating Liu 1 , Guigan Fang 2, 3 , Chaobo Huang 1, 2 , Orlando J. Rojas 4 , Hui Pan 1, 2
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This work investigates multifunctional composite films synthesized with cellulose nanofibers (CNFs) and poly(vinyl alcohol) (PVA). First, TEMPO-oxidized CNFs were modified in the heterogeneous phase with benzophenone, diisocyanate, and epoxidized soybean oil via esterification reactions. A thorough characterization was carried out via elemental analysis as well as FT-IR and X-ray photoelectron spectroscopies and solid-state NMR. Following, the surface-modified CNFs were combined with PVA to endow composite films with UV-absorbing capabilities while increasing their thermomechanical strength and maintaining a high light transmittance. Compared to neat PVF films, the tensile strength, Young modulus, and elongation of the films underwent dramatic increases upon addition of the reinforcing phase (maximum values of ∼96 MPa, ∼ 714 MPa, and ∼350%, respectively). A high UV blocking performance, especially in the UVB region, was observed for the introduced multifunctional PVA films at CNF loadings below 5 wt %. The trade-off between modified nanofibril function as interfacial reinforcement and aggregation leads to an optimum loading. The results indicate promising applications, for example, in active packaging.
中文翻译：
具有改性的纤维素纳米纤维的高透明，强韧和柔性膜，具有紫外线屏蔽性能
这项工作研究了由纤维素纳米纤维（CNF）和聚乙烯醇（PVA）合成的多功能复合膜。首先，TEMPO氧化的CNF在多相中通过二苯甲酮，二异氰酸酯和环氧化大豆油通过酯化反应进行修饰。通过元素分析，FT-IR和X射线光电子能谱以及固态NMR进行了全面的表征。随后，将表面改性的CNF与PVA结合使用，使复合膜具有吸收紫外线的能力，同时增加其热机械强度并保持高透光率。与纯PVF薄膜相比，添加增强相后薄膜的拉伸强度，杨氏模量和伸长率显着增加（最大值约为96 MPa，约为714 MPa和约为350％，分别）。在CNF含量低于5 wt％的情况下，对于引入的多功能PVA薄膜，观察到了很高的紫外线阻隔性能，尤其是在UVB区域。改性的纳米原纤维作为界面增强剂和聚集体之间的权衡取舍导致了最佳负载。结果表明有希望的应用，例如在主动包装中。
更新日期：2018-11-09
中文翻译：
具有改性的纤维素纳米纤维的高透明，强韧和柔性膜，具有紫外线屏蔽性能
这项工作研究了由纤维素纳米纤维（CNF）和聚乙烯醇（PVA）合成的多功能复合膜。首先，TEMPO氧化的CNF在多相中通过二苯甲酮，二异氰酸酯和环氧化大豆油通过酯化反应进行修饰。通过元素分析，FT-IR和X射线光电子能谱以及固态NMR进行了全面的表征。随后，将表面改性的CNF与PVA结合使用，使复合膜具有吸收紫外线的能力，同时增加其热机械强度并保持高透光率。与纯PVF薄膜相比，添加增强相后薄膜的拉伸强度，杨氏模量和伸长率显着增加（最大值约为96 MPa，约为714 MPa和约为350％，分别）。在CNF含量低于5 wt％的情况下，对于引入的多功能PVA薄膜，观察到了很高的紫外线阻隔性能，尤其是在UVB区域。改性的纳米原纤维作为界面增强剂和聚集体之间的权衡取舍导致了最佳负载。结果表明有希望的应用，例如在主动包装中。
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