Preparation of Antibacterial Polymer-grafted Nano-sized Silica and Surface Properties of Silicone Rubber Filled with the Silica

Yamashita, Risako; Takeuchi, Yoko; Kikuchi, H; Shirai, Kumi; Yamauchi, Takeshi; Tsubokawa, Norio

doi:10.1295/polymj.pj2005225

Cited by 14 publications

(16 citation statements)

References 20 publications

(32 reference statements)

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“…Desirable properties in waterborne coatings include flexibility [ 29 , 88 , 117 ], adhesion [ 81 , 118 , 119 ], wear resistance [ 92 , 102 , 120 , 121 , 122 ], and durability [ 120 ]. Among the possibilities for added coating functionality are, for example, flame retardancy [ 119 ], solvent and chemical resistance [ 123 , 124 ], stain resistance [ 102 , 124 ], anti-cavitation [ 81 ], extreme robustness (for space-based applications) [ 125 ], antimicrobial activity [ 126 , 127 , 128 , 129 , 130 , 131 ], superhydrophobicity [ 84 , 95 , 124 , 132 , 133 , 134 , 135 , 136 , 137 , 138 ], or photoactive fluorescent coatings [ 29 ] presented in Table 3 .…”

Section: Applications Of Hybrid Nanostructured Filmsmentioning

confidence: 99%

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

2021

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Combining organic and inorganic components at a nanoscale is an effective way to obtain high performance coating materials with excellent chemical and physical properties. This review focuses on recent approaches to prepare hybrid nanostructured waterborne coating materials combining the mechanical properties and versatility of silica as the inorganic filler, with the flexural properties and ease of processing of the polymer matrix. We cover silica-polymer coupling agents used to link the organic and inorganic components, the formation of hybrid films from these silica-polymer nanostructures, and their different applications. These hybrid nanostructures can be used to prepare high performance functional coatings with different properties from optical transparency, to resistance to temperature, hydrophobicity, anti-corrosion, resistance to scratch, and antimicrobial activity.

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Section: Applications Of Hybrid Nanostructured Filmsmentioning

confidence: 99%

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

2021

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“…(2) elements remain, namely, 2) , and χ XXZ (2) = χ YYZ (2) , and the intensity of the generated SFG signal is given by linear combinations of these effective second-order susceptibility tensor elements (χ (2),eff ). These linear combinations can be probed with four sets of polarizations of the incident and generated beams denoted as ssp, sps, pss, and ppp.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Using the same arguments, the sps configuration (χ YZY (2) ) detects vibrational modes with a dipole moment parallel to the surface, whereas in the ppp configuration (χ ZZZ (2) , χ XXZ (2) , χ XZX (2) , and χ ZXX (2) ), vibrational modes with both perpendicular and parallel dipole components are probed. The corresponding SFG intensities for each polarization set are given by …”

Section: ■ Introductionmentioning

confidence: 99%

“…This larger intensity is explained by the derivatives of the dipole moment with respect to the normal coordinates, which are almost perpendicular to the surface ( Figure 5) and have a larger amplitude because of the larger polarity of the SiH bond. In addition to leading to large IR and Raman intensities, they lead to dominant χ ZZZ (2) tensor components for the g 1 + and g 2 + modes. Without the Surface: Dependence on the Rotation Angle ξ.…”

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confidence: 99%

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Theoretical Investigation of Vibrational Sum-Frequency Generation Signatures of Functionalized H—Si(111)

2015

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Developments toward a general approach for simulating and interpreting the sum-frequency generation signatures of functionalized surfaces are reported. This approach encompasses two steps: (1) The molecular properties (vibrational frequencies, IR and Raman quantities) are evaluated using first-principles approaches implemented in standard quantum chemistry programs, and (2) the macroscopic optical responses (second-order nonlinear optical susceptibility tensor) of the adsorbate on its substrate are determined within the three-layer model of the interface. A homemade code was written to carry out this second step, including (1) the evaluation of the Fresnel factor and (2) the determination of the molecular orientation in the laboratory frame. This approach and program allow for the generation of the SFG spectra for different combinations of molecular orientations and experimental setups, as well as the identification of the vibrational modes to facilitate their analysis. Then, the approach is illustrated in the case of a decyl chain covalently bonded to hydrogen-terminated Si(111) [ Si(CH 2 ) 9 CH 3 ]. The simulated ppp spectrum agrees closely with experiment, whereas the agreement gets worse when parts of the chain are frozen, demonstrating that the SFG signature originates from a large part of the decyl chain. Calculations were also performed for the other sets of polarizations (sps, ssp, and pss), highlighting the fact that the spectral profile varies considerably from ppp to ssp, sps, and pss, which is attributed to the combined effects of the Fresnel factors and the structure of the χ (2),R tensor. The impact of the orientation of the alkyl chain (tilt and rotation angles) on the ppp SFG intensity was then monitored by reducing the system to an isolated decane molecule and determining the changes in the SFG spectral pattern related to the orientation of the IR dipole moment.

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“…In the previous paper, we have succeeded in the grafting of polymer having alkylphosphonium sulfate groups (poly(St-SO 3 À P þ (Bu) 3 R)) onto the surface of silica nanoparticle. 12 We have pointed out that the surface of silicone rubber filled with the poly(St-SO 3 À P þ (Bu) 3 R)-grafted silica shows strong antibacterial activity to a Staphylococcus aureus and an Escherichia coli.…”

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confidence: 98%

Preparation of Antibacterial Polymer-Grafted Silica Nanoparticle and Surface Properties of Composites Filled with the Silica (2)

et al. 2009

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Antibacterial polymer was grafted onto silica nanoparticle and the surface properties of various composites filled with the silica were investigated. The grafting of antibacterial polymer, poly(vinylbenzyltributylphosphonium chloride) (poly(St-CH 2 P þ (Bu) 3 Cl À )), onto silica surface was achieved by two methods: one is treatment of poly(vinylbenzylchloride) (poly(St-CH 2 Cl))-grafted silica with tributylphosphine and the other is direct grafting of poly(St-CH 2 P þ (Bu) 3 Cl À ) by radical graft polymerization of the corresponding monomer. The grafting of poly(St-CH 2 Cl) and poly(St-CH 2 P þ (Bu) 3 Cl À ) onto silica surface were initiated by the system consisting of trichloroacetyl groups on the silica surface and Mo(CO) 6 . Trichloroacetyl groups were introduced onto the silica surface by the reaction of amino groups on the silica surface with trichloroacetyl isocyanate. The percentage of poly(St-CH 2 Cl) grafting during the graft polymerization initiated by the system increased with progress of the polymerization reached 116%. The grafting of poly(St-CH 2 P þ (Bu) 3 Cl À ) onto silica surfaces was confirmed by FT-IR spectra, thermal decomposition gas chromatograms and mass spectra (GC-MS), and 13 C-CP/MAS NMR. The surfaces of silicone rubber, polystyrene film, and paints filled with the poly(St-CH 2 P þ (Bu) 3 Cl À )-grafted silica shows strong antibacterial activity. These composites retained the antibacterial activity even after the boiling in water for 24 h.

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Preparation of Antibacterial Polymer-grafted Nano-sized Silica and Surface Properties of Silicone Rubber Filled with the Silica

Cited by 14 publications

References 20 publications

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

Theoretical Investigation of Vibrational Sum-Frequency Generation Signatures of Functionalized H—Si(111)

Preparation of Antibacterial Polymer-Grafted Silica Nanoparticle and Surface Properties of Composites Filled with the Silica (2)

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