Microstructure and antibacterial performance of functionalized polyurethane based on polysiloxane tethered cationic biocides

Zhang, Qinghua; Liu, Hailong; Zhan, Xiaoli; Chen, Fengqiu; Yan, Jie; Tang, Hao

doi:10.1039/c5ra12945a

Cited by 26 publications

(17 citation statements)

References 49 publications

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“…increased obviously from 0.18 for the untreated catalyst to 0.26 for the treated catalyst at 300 C. The ratio, i.e., the amount of hydroxyl groups, was in exact accordance with the order of the catalytic activity shown in Fig. 36,37 The ratio of the steam treated catalyst was greater than that of the untreated catalyst. This indicated that the hydroxyl groups promoted the catalytic activity of the B-Li 3 PO 4 catalyst.…”

Section: The Effect Of Steam Treatment On the Catalytic Activitysupporting

confidence: 74%

Steam treatment of a hollow lithium phosphate catalyst: enhancing carbon deposition resistance and improving the catalytic performance of propylene oxide rearrangement

Wang

et al. 2016

RSC Adv.

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Carbon deposition is a great problem for most solid acid and base catalysts applied in organic catalytic reactions. Basic lithium phosphate catalyst, when used for propylene oxide rearrangement, is also easily deactivated due to carbon deposition. In this paper, a green surface modification technique of steam treatment was employed to suppress carbon deposition on the basic lithium phosphate catalyst and to improve its catalytic performance. The results showed that the catalyst which was pre-treated with steam at 300 C for 30 minutes exhibited excellent catalytic activity. Furthermore, the amount of carbon deposition was 15.1%, much lower than that of the untreated catalyst (21.5%). The steam treatment could increase the amount of hydroxyl and adjust the distribution of the acid and base sites. The decrease of the amount of Brønsted acid sites resulted in the reduction of carbon deposition. The enhancement of activity could be attributed to the increase of synergistic sites, and this could be due to an increase in the amount of Lewis acid sites and in the strength of the base sites.

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Section: The Effect Of Steam Treatment On the Catalytic Activitysupporting

confidence: 74%

Steam treatment of a hollow lithium phosphate catalyst: enhancing carbon deposition resistance and improving the catalytic performance of propylene oxide rearrangement

Wang

et al. 2016

RSC Adv.

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“…The sample composed of 50 wt% of PS 54 ‐ b ‐PTTBM‐B 23 exhibits, however, a more homogeneous surface, fact that can explain the lower contact angle values found. The surface roughness is probably due to a phase separation process as a consequence of the incompatibility of the different blend components . The surface morphology of the prepared films was further examined by AFM, as depicted in Figure 3 for the sample containing 10 wt% of PS 54 ‐ b ‐PTTBM‐M 44 .…”

Section: Resultsmentioning

confidence: 99%

“…The surface roughness is probably due to a phase separation process as a consequence of the incompatibility of the different blend components. [25] The surface morphology of the prepared films was further examined by AFM, as depicted in Figure 3 for the sample containing 10 wt% of PS 54 -b-PTTBM-M 44 . The topography images show that the surfaces have both micro and nanoroughness, which increase significantly the surface area of the antimicrobial films.…”

Section: Antimicrobial Films Preparation and Surface Characterizationmentioning

confidence: 99%

Contact Active Antimicrobial Coatings Prepared by Polymer Blending

Cuervo-Rodríguez

López-Fabal

Gómez-Garcés

et al. 2017

Macromolecular Bioscience

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Herein, contact active antimicrobial films are prepared by simply blending cationic amphiphilic block copolymers with commercial polystyrene (PS). The copolymers are prepared by combining atom transfer radical polymerization and "click chemistry." A variety of copolymers are synthesized, and composed of a PS segment and an antimicrobial block bearing flexible side chain with thiazole and triazole groups, 4-(1-(2-(4-methylthiazol-5-yl)ethyl)-1H-1,2,3-triazol-4-yl) butyl methacrylate (TTBM). The length of the TTBM block is varied as well as the alkylating agent. Different films are prepared from N,N-dimethylformamide solution, containing variable PS-b-PTTBM/PS ratio: from 0 to 100 wt%. Remarkably, the blend films, especially those with 30 and 50 wt% of copolymers, exhibit excellent antimicrobial activities against Gram-positive, Gram-negative bacteria and fungi, even higher than films prepared exclusively from the cationic copolymers. Blends composed of 50 wt% of the copolymers present a more than 99.999% killing efficiency against the studied microorganisms. The better activity found in blends can be due to the higher roughness, which increases the surface area and consequently the contact with the microorganisms. These results demonstrate that the use of blends implies a reduction of the content of antimicrobial agent and also enhances the antimicrobial activity, providing new insights for the better designing of antimicrobial coatings.

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“…On the other hand, polymers with quaternary ammonium groups (cationic biocidal moieties) are probably the most explored class of polymeric biocides [4]. Polysiloxanes are well known for their efficiency in reducing the formation of biofilms via their fouling-release characteristics [5,6,7] as a result of their low surface energy, low modulus and high flexibility [8,9,10]. The incorporation of inorganic slow-release biocides into polysiloxanes has been shown to be effective in reducing the degree of biofouling taking place on surfaces in the coating industry [9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties

Mansouri

Truong

MacLaughlin³

et al. 2019

Nanomaterials

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In this work, we report on the incorporation of a siloxane copolymer additive, poly((2-phenylethyl) methylsiloxane)-co(1-phenylethyl) methylsiloxane)-co-dimethylsiloxane), which is fully soluble at room temperature, in a rapid-cure thermoset polyester coating formulation. The additive undergoes polymerization-induced phase segregation (PIPS) to self-assemble on the coating surface as discrete discoid nanofeatures during the resin cure process. Moreover, the copolymer facilitates surface co-segregation of titanium dioxide pigment microparticulate present in the coating. Depending on the composition, the coatings can display persistent superhydrophobicity and self-cleaning properties and, surprisingly, the titanium dioxide pigmented coatings that include the siloxane copolymer additive display high levels of antibacterial performance against Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) bacteria. This antibacterial performance is believed to be associated with the unique surface topology of these coatings, which comprise stimuli-responsive discoid nanofeatures. This paper provides details of the surface morphology of the coatings and how these relates to the antimicrobial properties of the coating.

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Microstructure and antibacterial performance of functionalized polyurethane based on polysiloxane tethered cationic biocides

Abstract: The designed polyurethane containing polysiloxanes tethered quaternary ammonium salt groups exhibited special surface migrations, low surface free energy and excellent antibacterial activity towardsEscherichia coli.

Cited by 26 publications

References 49 publications

Steam treatment of a hollow lithium phosphate catalyst: enhancing carbon deposition resistance and improving the catalytic performance of propylene oxide rearrangement

Steam treatment of a hollow lithium phosphate catalyst: enhancing carbon deposition resistance and improving the catalytic performance of propylene oxide rearrangement

Contact Active Antimicrobial Coatings Prepared by Polymer Blending

Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties

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