Preparation of Cationic Poly(acrylamide)/Bentonite Nanocomposites from in situ Inverse Emulsion Copolymerization and Their Performance in Papermaking

2013 ◽  
Vol 32 (1) ◽  
Author(s):  
Dong Ho Yoon ◽  
Jung Won Jang ◽  
Seung Suck Seo ◽  
Soo-Hwan Jeong ◽  
In Woo Cheong
Keyword(s):  
Emulsion Copolymerization ◽  
Inverse Emulsion ◽  
Poly Acrylamide

scholarly journals Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1403 ◽  
Author(s):  
Jie Li ◽  
Bing Xie ◽  
Kai Xia ◽  
Yingchun Li ◽  
Jing Han ◽  
...  
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Silver Ions ◽  
Antibacterial Activities ◽  
Nano Tio2 ◽  
Inverse Emulsion ◽  
Potential Applications

Nano titanium dioxide (TiO2) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO2-chitosan (STC) and TiO2-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO2 nanoparticles on the cross-linked chitosan microsphere. The STC with regular particle size of 1–10 μm exhibited excellent antibacterial activity against E. coli, P. aeruginosa and S. aureus under visible light. It is believed that STC with particle size of 1–10 μm has large specific surface area to contact with bacterial cell wall. The increased antibacterial activity was attributed to the enhancement of both electron-hole separations at the surface of nano-TiO2 by the silver ions under the visible light, and the synergetic and sustained release of strong oxidizing hydroxyl radicals of nano-TiO2, together with silver ions against bacteria. Thus, STC composites have great potential applications as antibacterial agents in the water treatment field.

Preparation and Properties of Nanocomposites Based on Poly(Vinyl acetate) and Montmorillonite Organized with Acrylic Acid

2011 ◽  
Vol 335-336 ◽  
pp. 3-11
Author(s):  
Jun Wang
Keyword(s):  
Acrylic Acid ◽  
Vinyl Acetate ◽  
Differential Scanning Calorimetric ◽  
X Ray Diffraction ◽  
Covalent Bonds ◽  
Emulsion Copolymerization ◽  
Fourier Transformation Infrared Spectroscopy ◽  
Ft Ir ◽  
Vinyl Group

The nanocomposites of poly(vinyl acetate)/montmorillonite (PVAc/MMT) were prepared using vinyl acetate and organically modified alkaline calcium base montmorillonite (MMT) by in situ emulsion copolymerization. The organic modification was acrylic acid including terminal reactive vinylic group. The samples were characterized using fourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD). Thermal properties of the PVAc/MMT films were studied by thermogravimetric (TG) and differential scanning calorimetric (DSC). The FT-IR results indicated that the vinyl group on the surface of the vinyl MMT nanoparticles had been successfully copolymerized with vinyl acetate. The XRD results demonstrated that the MMT was exfoliated during polymerization. The exfoliated PVAc/MMT nanocomposites showed a lower glass transition temperature (Tg) and a worse thermal stability compared with the pure PVAc. However, bonding power of the nanocomposite latex of PVAc/MMT was improved due to the strong interaction between silica nanoparticles and polymer matrix via covalent bonds.

Core-Shell Magnesium Hydroxide/Polymermer Nanoparticles Prepared by In Situ Emulsion Copolymerization

2011 ◽  
Vol 233-235 ◽  
pp. 2125-2128
Author(s):  
Li Li Xu ◽  
Sheng Peng Liu ◽  
Xuan Li
Keyword(s):  
Magnesium Hydroxide ◽  
Chemical Structure ◽  
Hybrid Nanoparticles ◽  
Core Shell ◽  
Polymer Shell ◽  
Emulsion Copolymerization ◽  
The Core ◽  
Polymer Hybrid ◽  
Transmission Electron

In this paper, vinylated magnesium hydroxide (MH) nanosheets were prepared with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) and pristine MH nanosheets, then the MH/polymer hybrid nanoparticles were prepared by in-situ emulsion copolymerization of vinylated MH nanosheets and styrene (St) monomer and styrene/butyl acrylate (St/BA) comonomer. The morphology, thermal stability and chemical structure of the final products were investigated in detail with transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier-transform infrared spectra (FTIR). The TEM results showed that the core-shell structure of MH/Polymer nanoparticles with MH-cores and Polymer-shell was formed.

“One-Pot” In Situ Formation of Gold Nanoparticles within Poly(acrylamide) Hydrogels

2013 ◽  
Vol 214 (10) ◽  
pp. 1114-1121 ◽  
Author(s):  
Natalya Dolya ◽  
Oscar Rojas ◽  
Sabine Kosmella ◽  
Brigitte Tiersch ◽  
Joachim Koetz ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
One Pot ◽  
In Situ Formation ◽  
Poly Acrylamide
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