Low surface energy materials have been extensively investigated for building icephobic surfaces in recent years. Polydimethylsiloxane (PDMS) and fluoropolymers have been introduced to this field, while control of their structures is of importance to produce deicing surfaces. In this work, fluorinated methacrylate block copolymers containing polyhedral oligomeric silsesquioxane (POSS) moieties were synthesized by reversible addition-fragmentation chain transfer polymerization and transformed into thiolated-copolymers by aminolysis to adjust the self-assembly and modify surface morphology. The icephobic coatings were developed via UV-curable thiol-ene reaction with tunable amounts of thiol-modified POSS-fluorinated methacrylate diblock copolymers with vinyl-functionalized PDMS and thiol-functionalized PDMS. Characterizations of atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle showed the evidence of the POSS-fluorinated diblock copolymers on the outmost surface of the coatings. Owing to the crystallization of perfluoroalkyl side groups, the coatings containing thiol-modified poly(methacrylisobutyl POSS)- b -poly(2-perfluorooctylethyl methacrylate) ( S17F ) exhibited excellent icephobicity, and water droplets could rebound completely on all S17F -containing surfaces at both normal and tilt modes before freeze even at −15 °C. The ice shear strengths of the prepared UV-cured coatings were about one-eighth of that on bare aluminum surface, while the coating containing 5% S17F achieved the lowest ice shear strength of 105 ± 12 kPa. It was found that the icephobicity of these coatings were attributed primarily to the synergistic effect of the POSS-fluorinated methacrylate diblock copolymer and the PDMS component.
Xiangzhao Wang,Xiaobin Huang,Zemin Ji,Wenbin Hu,Haoqiang Sheng,Xiaofei Li
Icephobic coatings have attracted wide attention due to low energy consumption, low cost, and high efficiency. However, the icephobic coating is vulnerable to external damage due to long-term exposure, which can result in icephobic properties loss and limit its industrial application. Herein, the novel amphiphilic epoxy self-healing icephobic coating was designed by a compound with multiple hydrophilic groups, polydimethylsiloxane (PDMS) with hydrophobic groups and 4, 4′-diaminodiphenyldisulfide (APD) with reversible bonds. Moreover, considering the resource crisis, the biobased epoxy (GTE) was selected as the compound containing hydrophilic groups. In this study, the GTE will form hydrogen bonds with water molecules to achieve an anti-icing effect, while PDMS mainly play a deicing effect due to low surface energy. Due to the reasonable design, the icephobic coating showed good comprehensive icephobic properties: a 12.5-fold increase in icing delay time (802 s) and a 6.6-fold decrease in ice adhesion strength (32.6 kPa) compared with bare aluminum . Furthermore, the crystallization temperature of water was reduced by about 11 °C. More importantly, the APD with reversible disulfide bonds provides the icephobic coating with self-healing performance, removability, and excellent UV shielding performance. The coating provides a new idea for the preparation of sustainable and durable coatings with comprehensive icephobic performance.
危险品化学品经营许可证（带存储）