文献类型：期刊文献

英文题名：Closed-loop recyclable bio-based covalent adaptable networks for high-efficiency UV shielding

作者：Luo, Ting[1] Sha, Ye[2] Bei, Yu[1,3] Meng, Zhonglei[4] Hu, Yun[1] Zhang, Meng[1] Zhou, Yonghong[1,3] Jia, Puyou[1]

第一作者：Luo, Ting

通信作者：Hu, Y[1];Zhou, YH[1];Jia, PY[1];Zhou, YH[2]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, 16 Suojin North Rd, Nanjing 210042, Peoples R China;[2]Nanjing Forestry Univ, Coll Sci, Nanjing 210037, Peoples R China;[3]Nanjing Forestry Univ, Coll Chem Engn, Nanjing 210037, Peoples R China;[4]Guangxi Forestry Res Inst, Guangxi Lab Forestry, Nanning 530002, Peoples R China

年份：2025

卷号：518

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20252418578646);Scopus(收录号：2-s2.0-105007516658);WOS:【SCI-EXPANDED(收录号:WOS:001519025100020)】；

基金：This study was funded by National Natural Science Foundation of China (Nos. 32401528 and 32471815) , Natural Science Foundation of Jiangsu Province of China (Grant Nos. BK20241745 and BK20240294) , and China Postdoctoral Science Foundation (2024M761427) .

语种：英文

外文关键词：Tung oil; UV-protected; Covalent adaptive network; Cyclic processing; Closed-loop recyclability

摘要：Large-scale commercial ultraviolet (UV) protective polymer materials are fabricated by a combination of polymer matrix and UV protection agents, which face challenges such incomplete UV coverage areas and plastic pollution caused by the retirement of products. The bio-based covalent adaptive networks (CANs) with physically, chemically closed-loop recyclability and full UV protection provides an effective strategy to solve this problem. Herein, we report a tung oil-based CANs based on dynamic (CN)-N- and S-S bonds to develop sustainable and full UV protection materials. The obtained CANs exhibited adjustable mechanical strength, cyclic processing performance, and shape memory effect due to the introduction of flexible fatty hydrocarbon chain of tung oil and reformation of dynamic (CN)-N- and S-S bonds. Furthermore, the CANs can be circular processed under mild conditions and chemically degraded in the presence of small molecule amines to recover oligomers (recovery rate of 83.13 %) and crosslinkers, which can be further used to synthesize the second generation CANs (efficiency >98 %). To underscore their application potential, these CANs were employed as UV protective materials, which provided a near 100 % protection in the full UV region due to reversible S-S/sulfhydryl conversion and (CN)-N-/aldehyde exchange. In addition, the CANs obtained after cyclic processing still kept full UV protection. Overall, this study presents a sustainable strategy for large scale practical application of full UV protection material. This sustainable strategy enables circularity in CANs materials, adding value to end-of-life UV protective products.