Preparation of Antibacterial WPU Nanometer Titanium Dioxide Composite

2013 ◽  
Vol 668 ◽  
pp. 388-392 ◽  
Author(s):  
Shi Zhou ◽  
Bing Zhou ◽  
Chun Ying Huang ◽  
Jia Jun Chen
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Dibutyltin Dilaurate ◽  
Polypropylene Glycol ◽  
Film Material ◽  
Thermogravimetric Analyzer ◽  
Infrared Spectrometer ◽  
Antibiotic Property ◽  
Nanometer Titanium Dioxide ◽  
Original Crystal

In the paper, WPU nanometer titanium dioxide composite is made mainly of polypropylene glycol (PPG), 2, 4-toluene diisocynate (TDI), nanometer titanium dioxide (TiO2), oleic acid (OA), dimethylolpropionic acid (DMPA), dibutyltin dilaurate (DBTDL), triethylamine (TEA), polypropylene glycol phosphate (PPG-P). Feature of nano particle is analyzed and tested by scanning electron microscope; Fourier infrared spectrum of nanoparticle and composite is tested by fourier infrared spectrometer under room temperature; thermal property test is conducted to composite by thermogravimetric analyzer; XRD test is conducted to nanoparticle and compound thin-film material by X-ray diffractometer; mechanical property of composite is tested by universal stretcher, proving that titanium dioxide does not change structure of WPU and titanium dioxide keeps the original crystal structure instead of being destroyed. Thermogravimetric analysis shows that titanium dioxide raises thermal stability of composite better; mechanical properties prove that increase of 2wt% nanometer titanium dioxide can raise mechanical properties of WPU. Titanium dioxide has extensive application prospect in production and life because it has optical activity and can raise antibiotic property of WPU.

A poly(arylene ether sulfone) hybrid membrane using titanium dioxide nanoparticles as the filler

2016 ◽  
Vol 29 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Yunwu Yu ◽  
Wenhao Pan ◽  
Xiaoman Guo ◽  
Lili Gao ◽  
Yaxin Gu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Gas Separation ◽  
Proton Nuclear Magnetic Resonance ◽  
Separation Performance ◽  
Hydroxyl Groups ◽  
Hybrid Membranes ◽  
Permeability Coefficients ◽  
Arylene Ether ◽  
The Matrix

Poly(arylene ether sulfone) (PES)–titanium dioxide (TiO2) hybrid membranes were prepared via solution blending method using TiO2 nanoparticles as inorganic filler. The chemical structure and thermal stability of the matrix polymer were characterized by proton nuclear magnetic resonance, Fourier transform infrared, differential scanning calorimetry, and thermogravimetric analysis. The crystal structure, morphology, mechanical properties, and gas separation performance of hybrid membranes were characterized in detail. As shown in scanning electron microscopic images, TiO2 nanoparticles dispersed homogeneously in the matrix. Although the mechanical properties of hybrid membranes decreased certainly compared to the pure PES membranes, they are strong enough for gas separation in this study. All gas permeability coefficients of PES-TiO2 hybrid membranes were higher than pure PES membranes, attributed to the nanogap caused by TiO2 nanoparticles, for instance, oxygen and nitrogen permeability coefficients of Hybrid-3 (consists of PES with 4-amino-phenyl pendant group and hexafluoroisopropyl (Am-PES)-20 and TiO2 nanoparticles, 5 wt%) increased from 2.57 and 0.33 to 5.88 and 0.63, respectively. In addition, the separation factor increased at the same time attributed to the stimulative transfer effect caused by the interaction of hydroxyl groups on the TiO2 nanoparticle and polar carbon dioxide molecules.

Optical, thermal and gas separation properties of acetate-containing copoly(ether-imide)s based on 6FDA and fluorenyl diamines

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1101-1111 ◽  
Author(s):  
Yunhua Lu ◽  
Jican Hao ◽  
Guoyong Xiao ◽  
Lin Li ◽  
Zhizhi Hu ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeation ◽  
Light Transmittance ◽  
Step Method ◽  
Ether Linkage ◽  
Nuclear Magnetic Resonance Spectrometer ◽  
Thermogravimetric Analyzer ◽  
Structures And Properties ◽  
Infrared Spectrometer ◽  
The Ideal

The diamine, 9,9-bis[4-(4-amino-3-hydroxylphenoxy)phenyl]fluorene (BAHPPF) was synthesized by the modified two-step method. Then, a series of acetate-containing copoly(ether-imide)s were prepared by the copolymerization of BAHPPF, 9,9-bis(4-aminophenyl)fluorene (BAF) and 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) followed by chemical imidization. The structures and properties of the BAHPPF and copoly(ether-imide)s were characterized by nuclear magnetic resonance spectrometer (NMR), Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), ultraviolet-visible spectrophotometer (UV-VIS), and tensile testing. Single gas permeation performances of these copoly(ether-imide)s were also studied for five representative gases of interest including H2, O2, N2, CO2, and CH4. The experimental results showed that the copoly(ether-imide)s showed excellent optical properties with high light transmittance above 80.2% at 450 nm. The glass transition temperature of these copolymers were higher than 333°C. Their tensile strength and Young’s module also increased, and the elongation decreased with the decrease of BAHPPF. High gas permeabilities of copoly(ether-imide)s were obtained, and the ideal selectivity of CO2/CH4 was improved due to the introduction of acetate group and flexible ether linkage. These copoly(ether-imide)s could be applied to the field of optics and gas separation.

Study on Synthesis and Thermal Property of Polyvinylamine

2010 ◽  
Vol 150-151 ◽  
pp. 1500-1503 ◽  
Author(s):  
Hong Chi Zhao ◽  
Qi Li ◽  
Wen Yu Xu ◽  
Fan Huang
Keyword(s):  
Decomposition Temperature ◽  
Characteristic Peak ◽  
Initial Decomposition Temperature ◽  
Nmr Spectrum ◽  
X Ray ◽  
Nuclear Magnetic Resonance Spectrometer ◽  
Chemical Structures ◽  
Thermogravimetric Analyzer ◽  
Infrared Spectrometer ◽  
Thermal Stability Of

Polyvinylamine (PVAm) and polyvinylamine chloride (PVAm•HCl) were synthesized by Hofmann degradation of polyacrylamide (PAM). The reaction condition is gentle and the operation is safe, simple and economical so that it is a good reaction method. The chemical structures and thermal properties of the polymers were studied by Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance spectrometer (NMR), X-ray diffractmeter (XRD) and thermogravimetric analyzer (TGA). Synthesis of PVAm•HCl was confirmed by the intensities of the characteristic peak of -CONH2 decreased and the appearance of a new absorption peak at 1530cm-1 (due to N-H bond of -NH3+ ) in the FTIR spectrum, the appearance of the characteristic absorption peaks of carbon atoms in the 13C NMR spectrum, the appearance of chemical shift assignments of proton in 1H NMR spectrum and the appearance of characteristic dispersing diffraction peak between 22.5° to 25.2° in the XRD spectrum, respectively. PAM had three decomposing stages, but PVAm•HCl had two decomposing stages. TG curve of PAM and PVAm•HCl showed that the initial decomposition temperature were 190oC and 140oC, respectively. The thermal stability of PVAm•HCl was poorer than that of PAM.

scholarly journals Atomistic investigation into the mechanical behaviour of crystalline and amorphous TiO2 nanotubes

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 28121-28129 ◽  
Author(s):  
Yanan Xu ◽  
Mingchao Wang ◽  
Ning Hu ◽  
John Bell ◽  
Cheng Yan
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Titanium Dioxide ◽  
Molecular Dynamics Simulations ◽  
Mechanical Behaviour ◽  
Tio2 Nanotubes ◽  
Amorphous Tio2 ◽  
Dynamics Simulations

The mechanical properties of titanium dioxide (TiO2) nanotubes are studied based on molecular dynamics simulations.

Influence of Polyacrylate on the Compatibility in P(MMA/EA)/PU Semi-IPNs

2012 ◽  
Vol 627 ◽  
pp. 873-877
Author(s):  
Xiao Xia Jian ◽  
Le Qin Xiao ◽  
Wei Liang Zhou ◽  
Hai Qin Ding
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Polymer Networks ◽  
Thermoplastic Elastomer ◽  
Ethyl Acrylate ◽  
Interpenetrating Polymer Networks ◽  
Structure And Properties ◽  
Infrared Spectrometer ◽  
Nuclear Magnetic Resonance Spectrometry ◽  
Magnetic Resonance Spectrometry

The Semi-Interpenetrating Polymer Networks(Semi-IPNs) of poly(methyl methyacrylate/ethyl acrylate)(P(MMA/EA)) and polyurethane thermoplastic elastomer (PU) were synthesized by PU and copolymer of methyl methacrylate and ethyl acrylate to improve the compatibility of polymethyl methacrylate(PMMA) and PU Semi-IPNs . The structure and properties were investigated by Fourier transform infrared spectrometer, Solid nuclear magnetic resonance spectrometry, Dynamic mechanical thermal analysis and Mechanical properties. The tensile stress of (P(MMA/EA)/PU)( P(MMA/EA):PU=3:7) can get to 9.6MPa, the additional physical crosslinks and entanglement for Semi-IPNs are the reasons.

The Effects of Nanometer Titanium Dioxide on Tumor Cells and in Rats with Nasopharyngeal Carcinoma

2020 ◽  
Vol 12 (12) ◽  
pp. 1431-1437
Author(s):  
Hui Liu ◽  
Peng Zhang ◽  
Fang Zhang ◽  
Qing Liu
Keyword(s):  
Titanium Dioxide ◽  
Nasopharyngeal Carcinoma ◽  
Tumor Cells ◽  
Delivery System ◽  
Cellular Level ◽  
Disease Treatment ◽  
Nanometer Titanium Dioxide ◽  
Xenotransplantation Model ◽  
Proliferation And Invasion

A drug delivery system based on nanomaterials has demonstrated a powerful function in disease treatment. In this study, a titanium-dioxide-nanotube-based cisplatin (nano-TiO2-DDP) delivery system was designed, and its effects in rats with nasopharyngeal carcinoma (NPC) and on tumor cells were analyzed. First, we obtained electrochemistry anodic oxidation (EAO) for the preparation of Nnano-TiO2, which was adopted as the carrier of cisplatin (CDDP). Then, we used a scanning electron microscope (SEM) to characterize and study the surface morphology of nano-TiO2. At the cellular level, flow cytometry, MTT, and Transwell assays were performed to analyze the apoptosis, proliferation, and invasion of cells treated by nano-TiO2-DDP, respectively. At the animal level, a xenotransplantation model was established for evaluating tumor growth and changes in experimental animals after injection of nano-TiO2-DDP. As a result, nano-TiO2-DDP strongly suppressed the invasion and vitality of tumor cells, induced their apoptosis, and delivered DDP more efficiently than did systems without a nano-TiO2 structure. In addition, injected nano-TiO2-DDP strongly inhibited the growth of solid tumors in vivo. Therefore, we believe that nano-TiO2-DDP can effectively suppress the growth of NPC, and it is more efficient than conventional drugs.

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