文献类型：期刊文献

英文题名：Highly Transparent, Strong, and Flexible Films with Modified Cellulose Nanofiber Bearing UV Shielding Property

作者：Niu, Xun[2] Liu, Yating[2] Fang, Guigan[1,3] Huang, Chaobo[1,2] Rojas, Orlando J.[4] Pan, Hui[1,2]

第一作者：Niu, Xun

通信作者：Pan, H[1];Pan, H[2]

机构：[1]Nanjing Forestry Univ, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat F, 159 Longpan Rd, Nanjing 210037, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coll Chem Engn, 159 Longpan Rd, Nanjing 210037, Jiangsu, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, Nanjing 210042, Jiangsu, Peoples R China;[4]Aalto Univ, Sch Chem Engn, Dept Bioprod & Biosyst, Biobased Colloids & Mat Grp BiCMat, FI-00076 Espoo, Finland

年份：2018

卷号：19

期号：12

起止页码：4565-4575

外文期刊名：BIOMACROMOLECULES

收录：;EI(收录号：20184906204205);Scopus(收录号：2-s2.0-85057547805);WOS:【SCI-EXPANDED(收录号:WOS:000453109200006)】；

基金：The authors are grateful for the financial support by the Forestry Industry Research Special Funds for the National Key Basic Research Program of China (2017YFD0601005), the Forestry Industry Research Special Funds for Public Welfare Projects (201504602), the project of the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, and Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP).

语种：英文

外文关键词：Cellulose - Cellulose films - Cellulose nanocrystals - Economic and social effects - Esterification - Nanocellulose - Nanofibers - Nuclear magnetic resonance spectroscopy - Polyvinyl alcohols - Soybean oil - Tensile strength

摘要：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, similar to 96 MPa, similar to 714 MPa, and similar to 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.