TiO2 colloidal nanocrystals functionalization of PMMA: A tailoring of optical properties and chemical adsorption

Convertino, Annalisa; Leo, G.; Tamborra, M.; Sciancalepore, Corrado; Striccoli, Marinella; Curri, M. Lucia; Agostiano, Angela

doi:10.1016/j.snb.2006.11.043

Cited by 56 publications

(33 citation statements)

References 16 publications

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“…Another trick that can be applied in the case of TiO 2 particles is to impose a hydrophobic character to their surface while the synthesis is taking place, to make them compatible with the polymer medium with which they will be mixed later on. This approach was successfully used by Convertino et al 56 to make a nanocomposite of TiO 2 phosphonic acid capped particles with PMMA. Silicone/TiO 2 compounds were also obtained by this method.…”

Section: Ex Situ Methodsmentioning

confidence: 99%

Novel approaches to flexible visible transparent hybrid films for ultraviolet protection

Calvo

Smirnov

Míguez

2012

J Polym Sci B Polym Phys

121

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Herein, we present an overview of the most recent achievements and innovations regarding the development of flexible visible transparent films for selective ultraviolet (UV) shielding, with focus on those based on hybrid inorganic-organic materials. The main synthetic paths used nowadays to ensure a high degree of protection are reviewed. Polymers containing organic UV absorbing molecules, hybrid mixtures of polymers and nanoparticles, and the recently introduced series of structures displaying structural color, are identified as the three main types of materials used for this purpose.The use of biocompatible and flexible films to achieve spectrally selective UV protection can find applications in a wide diversity of fields such as photo-treatment of skin diseases, food and beverage packing, and storage of cosmetics. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: [945][946][947][948][949][950][951][952][953][954][955][956] 2012

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Section: Ex Situ Methodsmentioning

confidence: 99%

Novel approaches to flexible visible transparent hybrid films for ultraviolet protection

Calvo

Smirnov

Míguez

2012

J Polym Sci B Polym Phys

121

View full text Add to dashboard Cite

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“…In bibliography, there are many articles about polymeric nanocomposites filled with ceramic oxides, nanoparticles, and a wide range of synthesis methods are described for developing this new interesting type of materials [5][6][7][8][9]. However, in order to prepare nanocomposites, the so-called top-down approach, where ex situ-preformed nanoparticles have to be dispersed into the polymeric matrix by physicalmechanical mixing, is still widely used [10,11].…”

Section: Introductionmentioning

confidence: 99%

Poly(methyl methacrylate)–TiO2 nanocomposites obtained by non-hydrolytic sol–gel synthesis: the innovative tert-butyl alcohol route

et al. 2012

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The present article concerns the preparation of poly(methyl methacrylate)/titania nanocomposites by a non-conventional bottom-up approach, as alternative to the conventional mechanical compounding of preformed filler particles. Poly(methyl methacrylate) (PMMA) was modi- fied with in situ generation of titania nanoparticles by means of the so-called non-hydrolytic sol–gel (NHSG) process in the presence of tert-butyl alcohol (tBuOH) as oxygen donor and polymer solvent. The results showed that the synthetic procedure used permitted the preparation of the highly filled PMMA (up to 20 phr of titania in anatase form) with titania actual content values very close to the nominal ones and with enhanced filler dispersion and homogeneous distribution within the polymeric matrix, avoiding the typical rheological problems related to distributive and dispersive mixing of conventional compounding methods. The presence of titania nanoparticles led to increases in glass transition temperature and E' modulus in the rubbery region for all the prepared samples with respect to the pristine PMMA. Finally, the nano-composites showed an interesting photo-catalytic activity towards organic molecules. The findings led us to conclude that the NHSG process was successfully employed to produce anatase titania in the presence of tBuOH and PMMA. The proposed process seems to offer a very promising method to produce polymer nanocomposites with good filler dispersion and homogeneous distribution and with interesting functional properties such as photo-catalytic activity

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“…Organophosphorus molecules like phosphates and phosphonates offer another possibility to modify the surface of metal oxide particles 14–18. These coupling agents have the advantage that they form hydrolytically stable bonds to metal oxide surfaces, while the commonly used trialkoxysilanes can form labile bonds under some conditions.…”

Section: Introductionmentioning

confidence: 99%

Polyester Preparation in the Presence of Pristine and Phosphonic‐Acid‐Modified Zirconia Nanopowders

Svehla

Pabisch

Feichtenschlager

et al. 2011

Macro Materials & Eng

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A novel zirconia polyester nanocomposite is prepared using an in situ approach. Surface‐functionalized zirconia nanoparticles are obtained by attaching 3‐phosphonopropionic acid to the metal oxide. Neat and surface‐covered metal oxide particles are incorporated at the beginning of the polyesterification reaction of isophthalic acid and neopentyl glycol resulting in zirconia/poly(neopentyl isophthalate) (PNI) nanocomposites. TEM shows that the dispersibility of the inorganic filler is improved by covering the zirconia surface with carboxylic acid groups. These results are verified by SAXS. Rheological measurements reveal that the viscosities are increasing compared to pristine PNI at particle loads of 10 wt% (neat zirconia) and 5 wt% (phosphonic‐acid‐capped zirconia), respectively.

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TiO2 colloidal nanocrystals functionalization of PMMA: A tailoring of optical properties and chemical adsorption

Cited by 56 publications

References 16 publications

Novel approaches to flexible visible transparent hybrid films for ultraviolet protection

Novel approaches to flexible visible transparent hybrid films for ultraviolet protection

Poly(methyl methacrylate)–TiO2 nanocomposites obtained by non-hydrolytic sol–gel synthesis: the innovative tert-butyl alcohol route

Polyester Preparation in the Presence of Pristine and Phosphonic‐Acid‐Modified Zirconia Nanopowders

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