文献类型：期刊文献

英文题名：Modification of nanocellulose via atom transfer radical polymerization and its reinforcing effect in waterborne UV-curable resin

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

第一作者：Wang, Qi

通信作者：Feng, XH[1];Liu, XY[1]

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

年份：2023

卷号：253

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：;EI(收录号：20233714719660);Scopus(收录号：2-s2.0-85170573644);WOS:【SCI-EXPANDED(收录号:WOS:001081368100001)】；

基金：This work was financially supported by grants from 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) . The authors are grateful to acknowledge the "Wood Nanotech-nology" laboratory of Prof. Qiliang Fu at the College of Materials Science and Engineering, Nanjing Forestry University, for providing an excellent experimental platform for this research, and Zhaozhe Yang at the Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, for guidance on FTIR and mechanical testing machines.

语种：英文

外文关键词：Cellulose nanocrystals; Atom transfer radical polymerization; Waterborne acrylic resin; UV-curable; Nanocomposites; Curing kinetics

摘要：Cellulose nanocrystals (CNCs) are green reinforcing materials, and their potential has been evaluated in the preparation of waterborne UV-curable resin composites with high-performance. Herein, we present a novel and scalable approach for preparing surface-modified CNCs with acrylic-based polymers to strengthen the compatibility and interaction between CNCs and UV-curable resins. Using tert-butyl acrylate as the monomer, the nanocellulose grafted copolymer CNC-g-PtBA was successfully synthesized via atom transfer radical polymerization (ATRP) in the presence of a macromolecular initiator. Then, the CNC-g-PtBA is blended into the acrylic resin as a nanofiller to prepare the UV-curable nanocomposite. The results indicated that the contact angle of the CNCs increased from 38.7 to approximately 74.8, and their thermal stability was significantly improved after graft modification. This contributed to the effective alleviation of the agglomeration phenomenon of nanocomposites due to the high hydrophilicity of pure CNCs. Notably, not only was the UV curing efficiency of the nanocomposites greatly increased but the mechanical properties were also further enhanced. Specifically, with the addition of 0.5 wt% CNC-g-PtBA, the curing time of the nanocomposite was shortened from >30 mins down to approximately 6 mins, and the bending strength was increased from 10 MPa for the original resin and 5 MPa for the addition of pure CNCs to 14.3 MPa, and the bending modulus was also greatly increased (up to approximately 730 MPa). Compared to pure CNCs, they are compatible with the resin, exhibiting high mechanical strength and flexibility, and have virtually no effect on the light transmission of the nanocomposites. Additionally, dielectric analysis (DEA) was used to monitor the dielectric constant and conductivity of the UVcurable nanocomposites in real time to further characterize their curing kinetics. The permittivity of these nanocomposites increased by 125 % compared to pristine resin, which shows potential for applications in high dielectric composites or for improving electrical conductivity. This work provides a feasible method for preparing UV-curable nanocomposites with high curing efficiency and permittivity, realizing a wider application of this high-performance nanocomposite.