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] Yang, Zhaozhe[3] Fu, Qiliang[4] Liu, Xinyou[1] Wang, Qi[1]

第一作者：Feng, Xinhao

机构：[1] College of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing, 210037, China; [2] Jiangsu Co-Innovation Center of Efficient Processing, Utilization of Forest Resources, Nanjing, 210037, China; [3] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, 210042, China; [4] Co-Innovation Center of Efficient Processing, Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240246316)

语种：英文

外文关键词：Cellulose - Cellulose derivatives - Crosslinking - Curing - Fourier transform infrared spectroscopy - Image enhancement - Kinetics - Nanocrystals - Photopolymerization - Polymer matrix composites

摘要：The interfacial-interactions between enhanced-nanoscale components and polymer matrix, as well as photopolymerization behavior of composite system, are of paramount importance to the quality and performance of photo-curable nanocomposites. Cellulose nanocrystals, a novel class of green-reinforcing materials, are anticipated to facilitate the development of high-performance applications. Herein, the promoting and enhancing effects of modified CNCs on photo-curable nanocomposites are studied. As confirmed by FTIR spectra, active radicals introduced on CNCs surface promote a stronger interfacial chemical interaction. Infrared thermography is performed to reflect the thermal energy changes during the photocuring of nanocomposites for investigating the acting mechanism of curing behavior. Notably, nanoscale structure and enhancement effect of CNCs contribute to the effective promotion of the curing reaction of polymer matrix molecules, increasing crosslink-density. The non-isothermal DSC test is employed to assess the thermal properties of photocured nanocomposites with varying contents of CNCs, in order to identify the optimal UV curing process. Kinetic analysis 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. The results demonstrated that 0.75wt%CNC-nanocomposites exhibited the most favorable reactivity at 50, 100mW/cm2 UV intensities, which is consistent with the mechanical property test data. In terms of micro-mechanism, active radicals on the surface enhance the ability of CNCs to chemically bind to photopolymer. This is coupled with their significant interfacial effects, which facilitate the formation of strong interfacial binding. These findings provide a solid foundation for the construction of high-performance photo-curable nanocomposites. ? 2024, The Authors. All rights reserved.