PDMS改性薄膜抗菌及防底栖硅藻附着性能研究

发布时间：2018-03-13 08:22

本文选题：PDMS薄膜　切入点：金黄色葡萄球菌　出处：《大连海洋大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,利用有机低表面能材料减少细菌粘附及无机抗菌材料的杀菌作用可协同提高表面的抗菌和耐沾污性能,已成为抗菌材料研究的重要发展方向之一。本文选取具有低表面能的PDMS(聚二甲基硅氧烷)作为研究对象,使用三氟乙酸(TFA)、钛酸四丁酯(TBT)及其复合体(TFA+TBT)对PDMS进行改性。以金黄色葡萄球菌、大肠杆菌作为供试菌种,对改性后的PDMS薄膜进行抗菌性能检测,研究其在清水、海水、空气中等条件下抗菌率的变化,并考察了三种改性薄膜对底栖硅藻附着的抑制作用。结果表明:PDMS改性薄膜具有较强的抗菌效果,在抗菌薄膜方面具有广泛的应用价值;同时改性薄膜具有一定的防硅藻附着功能,在海洋防污领域具有一定的应用前景。具体成果如下:1.三种改性的PDMS薄膜样品,在聚合初期抗菌率为100%。在空气中静置10天,抗菌率依然全部达到99%以上,具有强抗菌性。在海水与清水浸泡10天,抗菌率可以达到90%以上,仍然具有较强的抗菌性。在海水与清水中放置30天,依然保持一定的抗菌性。经TBT、(TFA+TBT)改性的PDMS表面产生相分离现象,表面分布有纳米Ti O2,紫外照射对改性薄膜的抗菌率有一定提高作用。经过紫外照射后的TBT改性PDMS薄膜在空气,清水以及海水中放置30天后,依然表现出强抗菌性,抗菌率达到99%以上,显著延长了改性薄膜的抗菌性能时效。经紫外照射后的TFA+TBT改性PDMS薄膜在空气,清水以及海水中放置30天,保持着90%以上的抗菌率。2.三种改性的PDMS薄膜对底栖硅藻的附着都有一定抑制作用,其中TFA改性薄膜的抑制作用最强,薄膜对底栖硅藻的抑制率会随着TFA含量的增加而增加。含有TBT改性的PDMS薄膜经过紫外照射后,对防底栖硅藻的附着性能都有一定程度的提升,特别是TFA+TBT薄膜,抑制率由21.97%提升到36.64%。通过抗菌性能的检测研究,在较短时间对抗菌材料的性能进行评价,了解其杀菌、抗菌机理,以期缩短抗菌材料的开发周期,为以后工作提供理论依据和基础性资料,同时也有助于新的抗菌材料的开发。通过对改性PDMS薄膜对防底栖硅藻附着性能研究,探索简单快速,行之有效的室内评价方法,对于将新型防污材料应用于海洋防污涂层领域具有指导作用。
[Abstract]:In recent years, the use of organic low surface energy materials to reduce bacterial adhesion and inorganic antibacterial materials can synergistically improve the antibacterial and anti-fouling properties of the surface. In this paper, PDMS (polydimethylsiloxane) with low surface energy is selected as the research object. PDMS was modified by trifluoroacetate (TFA), tetrabutyl titanate (TBT) and its complex. Staphylococcus aureus and Escherichia coli were used to test the antibacterial properties of the modified PDMS film. The effect of three kinds of modified films on the adhesion of benthic diatoms was investigated. The results showed that the modified films had strong antibacterial effect and had wide application value in antibacterial films. At the same time, the modified PDMS film has a certain anti-diatom adhesion function and has a certain application prospect in the field of marine antifouling. The concrete results are as follows: 1.The antibacterial rate of the three modified PDMS films at the initial stage of polymerization is 100g, and the antiseptic rate is 100g in the air for 10 days. The antimicrobial rate is still above 99% and has strong antibacterial activity. After immersion in seawater and water for 10 days, the antimicrobial rate can reach more than 90%, and it still has strong antimicrobial activity. Put in seawater and clear water for 30 days, The surface of PDMS modified by TBT / TBT has phase separation phenomenon, the surface distribution of nano-TiO _ 2, the effect of ultraviolet irradiation on the antibacterial rate of the modified PDMS film is improved, and the PDMS film modified by ultraviolet irradiation is in air. After being placed in water and seawater for 30 days, the antibacterial activity of PDMS film was still strong, and the antibacterial rate was more than 99%, which significantly prolonged the aging of the modified film. The TFA TBT modified PDMS film after ultraviolet irradiation was in air. In water and seawater for 30 days, the antimicrobial rate of above 90% was maintained. The three modified PDMS films could inhibit the adhesion of benthic diatoms to some extent, among which the TFA modified film had the strongest inhibitory effect. The inhibition rate of the film on benthic diatoms would increase with the increase of TFA content. After ultraviolet irradiation, the adhesion of PDMS film modified with TBT to benthic diatoms was improved to some extent, especially the TFA TBT film. The inhibition rate was increased from 21.97% to 36.640.Through the study of antimicrobial properties, the performance of antibacterial materials was evaluated in a short time to understand its bactericidal and antibacterial mechanism, in order to shorten the development period of antimicrobial materials. It provides theoretical basis and basic data for future work, and also contributes to the development of new antimicrobial materials. By studying the adhesion of modified PDMS film to benthic diatoms, a simple, fast and effective indoor evaluation method is explored. It is useful for the application of new antifouling materials in the field of marine antifouling coatings.
【学位授予单位】：大连海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X55

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