Institutional Repository of Key Laboratory of Marine Environmental Corrosion and Bio-fouling, IOCAS
|Place of Conferral||中国科学院海洋研究所|
（1）首次通过一种非常简便和廉价的方法开发了一种具有良好的力学、自修复和防污性能的新型有机硅聚（脲-硫脲）/单宁酸复合材料（PDMS-P(Ua-TUa)-TA）。硫脲基、脲基和单宁酸（TA）分子之间形成的多个动态氢键使弹性体具有优异的力学性能（拉伸强度：2.47 MPa，扯断伸长率：~1000%）。薄膜上的划痕在空气中12分钟内完全消失，材料3小时后的自修复效率高达98.4%，在人工海水中12小时的自修复效率可达到95.1%。此外，TA均匀地分散在聚合物基体中使涂层具有优异的抗菌和抗藻性能以及对基体的强附着力（玻璃纤维增强环氧树脂（GFE）：~2.2 MPa；钢片：~3.2 MPa）。实验室生物试验显示，PDMS-P(Ua-TUa)-TA具有出色的静态防污性能，对海洋细菌大肠杆菌、金黄色葡萄球菌和假单胞菌分别减少96%、95%和93%的粘附，对舟形藻减少了84%的附着。这项工作为开发高性能硅基防污涂层提供了一条有希望的途径。
（2）通过功能化单体硫辛酸-苯并噻唑（LA-BTZ）与LA改性的聚二甲基硅氧烷（PDMS）基聚氨酯（PDMS-PUU-LA）之间的二硫交换反应，开发了一种具有双重防污和防腐性能的新型智能自修复硅基涂料。聚合物主链中的灵活的动态共价二硫键和强大的动态交联氢键确保了材料具有优异的拉伸强度（2.58 MPa）、扯断伸长率（1014.7%）和自修复性能。研究发现，室温下薄膜在空气中的划痕在40分钟内完全消失，材料在空气中和人工海水中的自修复效率分别为98.5%（4 h）和94.6%（8 h）。涂层对GFE和钢基底的附着强度分别为~2.50 MPa和~3.33 MPa。此外，实验室生物实验和长达120天的实海挂板实验结果表明，本研究中没有添加任何有毒杀生剂的涂层具有优异的静态防污性能。此外，电化学阻抗和盐雾测试结果表明，该涂层在长期的浸泡实验中也具有良好的耐腐蚀性。因此，这项工作提出了一种有效的用于海洋防污和防腐蚀新型生态友好型智能硅涂层。
（3）首次合成了抗菌小分子丙烯酰胺-苯并噻唑、功能化硅烷封端调聚物和二氧化锆溶胶，最后通过简便的溶胶-凝胶反应制备了环保透明有机硅杂化硬质涂层。由于二氧化锆溶胶与长链“功能化”硅烷封端调聚物的共价键合，使得杂化涂层不仅具有良好的柔韧性，而且具有高硬度（6H）以及对基材的良好附着力（GFE：2.24 MPa；钢片：2.94 MPa）；杂化涂层SG-1，SG-2和SG-3的表面能在22 mJ/m2和25 mJ/m2之间，并且涂层的粗糙度Rq小于5 nm，表面非常光滑，使其具有良好的污损释放能力。此外，由于杂化网络中引入了硅烷封端调聚物，聚合物中的苯并噻唑基团，PEG链段和吡咯烷酮基团的存在赋予了涂层优异的污损阻抗性能，并且该杂化涂层并无任何杀生物质的释放。本研究为开发高性能新型环保透明硬质海洋防污涂层提供了新的思路。
Biofouling is a serious problem in the marine industries. The attachment of fouling organisms to surfaces increases the fuel consumption of ships and introduces hazards to engineered structures, such as accelerated biocorrosion and blocked seawater inlet and drainage pipelines of nuclear power plants. Poly(dimethylsiloxane) (PDMS) elastomers are widely used in fouling release coatings due to their stable chemical properties, smooth surface, low surface energy, and low elastic modulus. These unique surface properties are unfavorable for the attachment of organisms and facilitate the removal of attached ones by shear force. However, applications of silicone-based fouling release coatings have been limited by several factors. First, existing coatings cannot prevent the growth of bacteria and algae on them, showing to poor antifouling performance under static conditions. Second, the low surface energy of silicone-based coatings leads to poor adhesion to the substrate, so the coatings can easily peel off the surface of facility after being immersed in seawater for a long time. Third, silicone-based coatings are easily damaged due to weak mechanical properties, which will reduce the lifetime. Therefore, this topic will start from three aspects: giving the static antifouling performance of silicone coating, enhancing its adhesion and improving its mechanical properties. The main research contents and results are as follows:
(1) A novel silicone-based poly(urea-thiourea)/tannic acid composite (PDMS-P(Ua-TUa)-TA) with excellent mechanical, self-healing and antifouling properties is developed. The multiple dynamic hydrogen bonds formed by thiourea groups, urea groups, and tannic acid (TA) molecules ensured a tough elastomer (ultimate strength: 2.47 MPa) with high stretchability (~1000%). TA molecules as partial hydrogen bonding cross-linking sites interacted rapidly with urea and thiourea groups before migration of polymer chains, resulting in fast and efficient self-healing. Scratches on the film completely disappeared within 12 min, and the repair efficiency of strength was up to 98.4% within 3 h under ambient condition. Self-healing behavior was also evaluated in artificial seawater and the healing efficiency was 95.1%. Furthermore, TA uniformly dispersed in the polymer matrix provides good antibacterial and anti-diatom properties, as well as strong adhesion to the substrates (Glass fiber reinforced epoxy resin (GFE): ~ 2.2 MPa, steel: ~ 3.2 MPa). Laboratory bioassays against marine bacteria adhesion (~96%, ~95% and ~93% reduction for P. sp., E. coli, and S. aureus, respectively) and diatom attachment (~84% reduction) demonstrated an outstanding antifouling property of the PDMS-P(Ua-TUa)-TA. This work provides a promising pathway towards the development of high-performance silicone-based coatings for marine anti-biofouling.
(2) The present study aimed to develop a novel smart self-healing silicone-based coating with dual antifouling and anti-corrosion properties was through disulfide exchange reaction between the functionalized monomer “lipoic acid-benzothiazole” (LA-BTZ) and LA modified polydimethylsiloxane (PDMS) based polyurea-urethane (PDMS-PUU-LA). Multiple dynamic bonds in backbone, flexible disulfide bonds, and strong cross-linked hydrogen bonds ensure the PDMS-based polymer with good toughness (2.58 MPa of ultimate strength), high stretchability (1014.7%), and self-healing properties. It was found that the scratches on the film in air completely disappeared within 40 minutes at room temperature. The time required for the healing efficiency of strength ranged between 98.5% and 94.6% under ambient condition and artificial seawater was only 4 and 8 hours, respectively. The adhesion strength of silicon-based coating to epoxy resin and steel substrate was ~2.50 MPa and ~3.33 MPa, respectively. In addition, results of laboratory bioassays and marine field test of 120-day demonstrated that coating without any additional toxic biocides in the present study had long-term static fouling-resistant properties. Further, results of electrochemical impedance spectroscopy and salt spary measurements in the present study showed that the coating also had good corrosion resistance in long-term immersion experiments. Therefore, the current work presented a novel eco-friendly smart silicone-based coating for marine antifouling and anti-corrosion.
(3) Antibacterial small molecule acrylamide-benzothiazole, functional silane capping polymer and zirconia sol were synthesized for the first time. Finally, environment-friendly transparent silicone hybrid hard coatings were prepared by simple sol-gel reaction. Due to the covalent bonding between zirconia sol and long-chain "functional" silane end-capping polymers, the hybrid coating not only has good flexibility, but also has high hardness (6H) and good adhesion to the substrate (GFE:2.24 MPa; steel: 2.94 MPa). The surface energy of hybrid coatings SG-1, SG-2 and SG-3 is between 22 mJ/m2 and 25 mJ/m2, and the roughness Rq of hybrid coatings is less than that of 5 nm, and the surface is very smooth, which makes them have good fouling release ability. In addition, due to the introduction of silane-capped telomers in the hybrid network, the presence of benzothiazole groups, PEG segments and pyrrolidone groups in the polymer gives the coating excellent fouling impedance properties, and the hybrid coating does not release any biocide. This study provides a new idea for the development of a new type of environment-friendly transparent hard marine antifouling coating.
|Subject Area||化学 ; 材料科学|
|MOST Discipline Catalogue||理学|
|Table of Contents|
|孙佳文. 有机硅基海洋防污材料的制备及性能研究[D]. 中国科学院海洋研究所. 中国科学院大学,2022.|
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