文献类型：期刊文献

英文题名：Kinetics analysis of radical photopolymerizations for UV-curable nanocomposites based on cellulose nanocrystals: Promoting and enhancing mechanisms

作者：Feng, Xinhao[1,2] Wang, Qi[1] Yang, Zhaozhe[3] Liu, Xinyou[1]

第一作者：Feng, Xinhao

通信作者：Wang, Q[1]

机构：[1]Nanjing Forestry Univ, Coll Furnishings & Ind Design, Nanjing 210037, Peoples R China;[2]Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing 210037, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China

年份：2025

卷号：287

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：;EI(收录号：20245017519191);Scopus(收录号：2-s2.0-85211502252);WOS:【SCI-EXPANDED(收录号:WOS:001389588700001)】；

基金：This work was financially supported by grants from National Key Research and Development Program of China (2023YFD2201500) , Natural Science Foundation of Jiangsu Province (BK20200779) , Youth Science and Technology Innovation Fund of Nanjing Forestry University (CX2019015) , the Natural Science Research Project of Jiangsu Colleges and Universities (19KJB220004) .

语种：英文

外文关键词：UV-curable nanocomposites; Cellulose nanocrystals; Photopolymer; Curing kinetics; Enhancing mechanism

摘要：The interfacial interactions between the enhanced nanoscale components and the polymer matrix, as well as the photopolymerization behavior of the composite system, are of paramount importance to the quality and performance of photo-curable nanocomposites. Cellulose nanocrystals (CNCs), a novel class of green reinforcing materials, are anticipated to facilitate the development of high-performance applications of advanced functional materials. Herein, the promoting and enhancing effects of modified CNCs on photo-curable nanocomposites are studied. As confirmed by the FTIR spectra, the active radicals introduced on the surface of the modified CNCs promote a stronger interfacial chemical interaction between the CNCs and the photopolymer molecules. Infrared thermography is performed to reflect the thermal energy changes during the photocuring of nanocomposites for investigating the acting mechanism of the modified CNCs on the curing behavior. Notably, the nanoscale structure and enhancement effect of CNCs contribute to the effective promotion of the curing reaction of the polymer matrix molecules, and increase their crosslink density. The non-isothermal differential scanning calorimetry (DSC) test is employed to assess the thermal properties of photocured nanocomposites with varying contents of modified CNCs, in order to identify the optimal UV curing process. Kinetic analysis based on the Kissinger model indicates that CNCs not only facilitated the formation of polymer networks, but also played a role in optimizing the reaction paths and reducing the energy barriers of the reactions. The results demonstrated that the 0.75 wt% CNC nanocomposites exhibited the most favorable reactivity at 50 and 100 mW/cm2 UV intensities, which is consistent with the mechanical property test data. In terms of micro-mechanism, the active radicals on the surface enhance the ability of CNCs to chemically bind to the photopolymer. This is coupled with their significant interfacial effects, which facilitate the formation of strong interfacial binding. The aforementioned findings provide a solid foundation for the construction of high-performance photo-curable nanocomposites.