The Research Of PDMS Modified Film Anti Bacteria And Benthic Diatoms Adhesion Property

In recent years, developing antibacterial composite materials based on the organics with low energy surface and the inorganic antibacterial materials can combine the advantages of reduction of bacterial adhesion and killing bacterial property, thereby improving the antibacterial and fouling resistance properties of the material surface. This research topic has become one of the important direction of development of antibacterial materials.This thesis choose PDMS with low surface energy as the research object, using trifluoroacetic acid(TFA), tetrabutyl titanate(TBT) and its complex(TFA+ TBT) to modifie PDMS. Staphylococcus aureus and Escherichia coli was used to examine the antibacterial rate of functional films by film applicator coating. To investigate the changes of antibacterial rate of the modified PDMS film in the case of UV irradiation, natural environment and long-term immersion in water, sea water. Inhibitory effect of the three kind of modified PDMS films on benthic diatoms was investigated. The results show that the: PDMS modified film has strong antibacterial effect, It has widely application value in the aspects of antibacterial films. At the same time the modified film has certain anti diatom adhesion function and has a good application prospect in the field of marine antifouling.The main conclusions of the study are as follows:1. The antibacterial rate of the three kinds of modified PDMS films are 100% in the initial stage of polymerization. The antibacterial rate of the three kinds of modified PDMS films are 99% in the natural environment. The films had strong antibacterial properties. We soaked the three kinds of modified PDMS films in pure water and sea water for 10 d respectively, the antibacterial rates of the films are more than 90%. It still had strong antibacterial properties. Furthermore, soaked in fresh water and sea water for 30 d, the films still maintain a certain antibacterial activity. On the surface of the PDMS modified by TBT,(TFA+TBT), there were existed phase separation and distribute anatase-nano-Ti O2, UV irradiation can improve the antibacterial rate of the modified film. The antibacterial ratios of the TBT films are more than 99% after UV irradiation. Even though we soaked in fresh water,sea water and natural environment for 30 d.It Significantly extend the antibacterial properties of the modified film. We soaked the TFA+TBT modified PDMS films in pure water,sea water and natural environment for 30 d respectively. It still had antibacterial properties more than 99% after UV irradiation.2. Inhibitory effect of the three kind of modified PDMS films on benthic diatoms was effective. Inhibitory effect of TFA modified PDMS film on benthic diatoms was significant. The inhibition rate of the modified PDMS films with TBT had a certain degree of ascension after UV irradiation. In particular, the inhibition rate of TFA+TBT modified PDMS film from 21.97% to 36.64%Through the detection of antibacterial properties,antibacterial materials’ properties were evaluated in a relatively short time, comprehending the sterilization, antibacterial mechanism of antibacterial materials in order to shorten the development cycle, and providding a theoretical basis andbasic data for future work, but also contribute to the development of new antimicrobial material. Based on the modified PDMS film on the adhesion property of anti benthic diatoms, to explore a simple rapid, effective method for laboratory evaluation, the antifouling materials applied in the field of marine antifouling coating has a guiding role.