Synthesis of TiO2/PAA nanocomposite by RAFT polymerization

Hojjati, Behnaz; Sui, Ruohong; Charpentier, Paul A.

doi:10.1016/j.polymer.2007.07.054

Cited by 99 publications

(58 citation statements)

References 43 publications

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“…However, the filled TiO 2 particles often exhibited still large size, wide size distribution, and irregular shape, leading to the frequent generation of many non-selective voids at the polymer/TiO 2 interface. It is well known that in situ formation of inorganic nanoparticles within polymer matrix is an effective method to solve these problems (Dong et al, 2000;Hojjati et al, 2007;Li et al, 2006). Nevertheless, there was only one article about polymer/TiO 2 nanocomposite membranes prepared by in situ method to the best of our knowledge (Vona et al, 2007), since the hydrolysis rate of titanium precursor was often too quick.…”

Section: Introductionmentioning

confidence: 99%

Chitosan/TiO2 nanocomposite pervaporation membranes for ethanol dehydration

Yang

Jiang

et al. 2009

Chemical Engineering Science

168

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Section: Introductionmentioning

confidence: 99%

Chitosan/TiO2 nanocomposite pervaporation membranes for ethanol dehydration

Yang

Jiang

et al. 2009

Chemical Engineering Science

168

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“…The original titania particles ( Figure 4a) have no absorption peaks from 1400 to 1800 cm -1 except a strong bands at 1630 cm -1 which is the characteristic of bending vibration of water molecules [21]. For the samples after functionalized by MAA coupling agent (Figure 4b and 4c), the peak at 1721 cm -1 is attributed to typical C=O vibration [22] and the bands at 1540, 1440, and 1410 cm -1 are due to the bidentate coordination between titanium centers and the carboxylic groups of MAA [19].…”

Section: Ft-ir Spectra Of the Modified Anatase Titania Nanoparticlesmentioning

confidence: 99%

Photocatalytic polymerization induced by a transparent anatase titania aqueous sol and fabrication of polymer composites

Wang¹,

Wang

Song³

et al. 2010

Express Polym. Lett.

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Abstract. The surface modification of the anatase titania nanoparticles prepared via a controlled nonhydrolytic sol-gel process is achieved by the formation of the bidentate coordination between titania and methacrylic acid (MAA) molecules. The in situ photocatalytic polymerization of methyl methacrylate (MMA) monomer is initiated by surface modified anatase titania nanoparticles under Xe lamp irradiation. A variety of techniques including differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and scanning electron microscopy (SEM) are employed to characterize the resulting materials. The glass transition temperatures and the thermal stabilities of polymethyl methacrylate (PMMA) composite materials prepared via photocatalytic polymerization are enhanced compared with pure polymer. The partial aggregation of titania nanoparticles in PMMA composite films is derived from the surface polymerization of MMA, which makes the inorganic particles hydrophobic and drives them to the water/oil interfaces.

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“…[12][13][14][15][16][17] More recently, radical polymerization grafting was improved by the reversible addition-fragmentation chain-transfer (RAFT) grafting method to allow the direct polymerization of a wide range of functional monomers in a controlled fashion with narrowly dispersed molecular weight. [18][19][20][21][22] It has already been shown that polymers bearing appropriate chemical functions can modulate cell attachment, spreading, and activity on these bioactive polymers. [23][24][25][26] The distributions of ionic groups along with the macromolecular chains create active sites, which can interact with extracellular proteins, such as fibronectin, implicated in cell response.…”

Section: Introductionmentioning

confidence: 99%

Grafting titanium nitride surfaces with sodium styrene sulfonate thin films

2014

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The importance of titanium nitride lies in its high hardness and its remarkable resistance to wear and corrosion, which has led to its use as a coating for the heads of hip prostheses, dental implants and dental surgery tools. However, the usefulness of titanium nitride coatings for biomedical applications could be significantly enhanced by modifying their surface with a bioactive polymer film. The main focus of the present work was to graft a bioactive poly(sodium styrene sulfonate) (pNaSS) thin film from titanium nitride surfaces via a two-step procedure: first modifying the surface with 3-methacryloxypropyltrimethoxysilane (MPS) and then grafting the pNaSS film from the MPS modified titanium through free radical polymerization. X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were used after each step to characterize success and completeness of each reaction. The surface region of the titanium nitride prior to MPS functionalization and NaSS grafting contained a mixture of titanium nitride, oxynitride, oxide species as well as adventitious surface contaminants. After MPS functionalization, Si was detected by XPS, and characteristic MPS fragments were detected by ToF-SIMS. After NaSS grafting, Na and S were detected by XPS and characteristic NaSS fragments were detected by ToF-SIMS. The XPS determined thicknesses of the MPS and NaSS overlayers were $1.5 and $1.7 nm, respectively. The pNaSS film density was estimated by the toluidine blue colorimetric assay to be 260 6 70 ng/cm 2

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Synthesis of TiO2/PAA nanocomposite by RAFT polymerization

Cited by 99 publications

References 43 publications

Chitosan/TiO2 nanocomposite pervaporation membranes for ethanol dehydration

Chitosan/TiO2 nanocomposite pervaporation membranes for ethanol dehydration

Photocatalytic polymerization induced by a transparent anatase titania aqueous sol and fabrication of polymer composites

Grafting titanium nitride surfaces with sodium styrene sulfonate thin films

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