文献类型：期刊文献

英文题名：Castor-oil-based UV-curable hybrid coatings with self-healing, recyclability, removability, and hydrophobicity

作者：Zhang, Jinshuai[1,2,3,4] Shang, Qianqian[1,2,3,4] Hu, Yun[1,2,3,4] Zhu, Guoqiang[1,2,3,4] Huang, Jia[1,2,3,4] Yu, Xixi[1,2,3,4,5] Cheng, Jianwen[1,2,3,4,5] Liu, Chengguo[1,2,3,4] Chen, Jianqiang[6] Feng, Guodong[1,2,3,4] Zhou, Yonghong[1,2,3,4]

第一作者：Zhang, Jinshuai

通信作者：Liu, CG[1];Liu, CG[2];Liu, CG[3];Liu, CG[4]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China;[2]Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China;[3]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China;[4]Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing 210042, Jiangsu, Peoples R China;[5]Nanjing Forestry Univ, Coll Sci, Nanjing 210037, Peoples R China;[6]Nanjing Forestry Univ, Coll Biol & Environm, Nanjing 210037, Peoples R China

年份：2022

卷号：165

外文期刊名：PROGRESS IN ORGANIC COATINGS

收录：;EI(收录号：20220511576859);Scopus(收录号：2-s2.0-85123756684);WOS:【SCI-EXPANDED(收录号:WOS:000766635600007)】；

基金：This research was funded by the Fundamental Research Funds of CAF (CAFYBB2020QA005) and the National Natural Science Foundation of China (31822009 and 31770615).

语种：英文

外文关键词：UV-curable coatings; Castor oil; Hindered urea bond; Self-healing; Recyclability

摘要：Restrained by the irreversibility of the permanently cross-linked networks formed by double bonds, UV-curable thermosets with self-healing and reprocessing properties especially those derived from renewable feedstocks are highly desired for practical applications. In this work, repairable, recyclable, removable, and hydrophobic UV curable polyurethane coatings derived from renewable castor oil were constructed by the employment of dynamic hindered urea bonds (HUBs). The resulting UV-curable materials not only showed high biobased contents (45.1%-47.6%), but also exhibited good thermal, mechanical, coating, and hydrophobic performance (a T-g of 67.0-77.8 degrees C, a tensile strength up to 16.6 MPa, a pencil hardness of 3H-5H, a flexibility of 2 mm, a water contact angle of 90.8-105.9 degrees, etc.). Furthermore, due to the rapid dissociation or exchange of HUBs and intramolecular hydrogen bonds, the resulting UV-curable coatings exhibited excellent repairability, weldability, recyclability, and removability at moderate temperatures. For instance, the selected sample (PU-Si-2) demonstrated a scratch healing efficiency up to 97.0% at 140 degrees C for 60 min and a welding efficiency (tensile strength) of 91.3% at 120 degrees C for 60 min. In particular, the UV-cured PU-Si-2 sample could be physically recycled at least 4 times with enhanced performance in tensile properties, and the resulting PU-Si-2 coatings were easily removed or recycled by using low-toxicity organic solvents like ethyl acetate and dimethylformamide.