Photoinitiation of buthylmethacrylate polymerization by colloidal semiconductor nanoparticles

Stroyuk, A. L.; Granchak, V. M.; Korzhak, A. V.; Kuchmii, S. Ya.

doi:10.1016/s1010-6030(03)00371-x

Cited by 78 publications

(56 citation statements)

References 34 publications

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“…The nanodimensional CdS is capable of initiating the polymerization of vinyl monomers under the influence of UV light. The polymerization mechanism involves interaction of the electrons and holes formed on the surface of the CdS under the influence of the radiation with the molecules of the monomer, leading to the formation of radicals and radical-ions [154]. Using only CdS as catalyst it was possible to achieve 2-3% conversion.…”

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

“…In [154] the mechanism of the effect of inorganic semiconducting CdS, ZnO, and Fe 2 O 3 nanoparticles in the presence of fluorescein and its analogs in isopropyl alcohol on the photopolymerization of butyl methacrylate (BMA) was investigated. It was established that it is due to the transition of the e CB − electron from the HOMO of the excited dye to the conduction band of the nanoparticle:…”

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

“…The phototransfer of an electron from the dye to the semiconductor can take place both through the S 1 and through the T state of the dye [154]. The effectiveness of such transfer depends on the size of the energy gap between the excited levels of the dye and the semiconductor.…”

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

“…The effectiveness of such transfer depends on the size of the energy gap between the excited levels of the dye and the semiconductor. The size of the gap is determined not only by the chemical structure of these components but also by the size of their particles [154]. In the absence of the dye the semiconducting nanoparticles can also initiate polymerization during photoexcitation at their absorption band.…”

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

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Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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The main factors affecting the degradation of dyed polymeric matrices by the action of light (conversion of light energy into thermal energy, electron phototransfer, population of triplets, aggregation of dyes, oxidation-reduction processes, interaction with oxygen, including singlet) are analyzed and classified. Their dependence on the structure of the dyes, the nature of the polymer, and the method of dyeing of the latter is examined. Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness. However, these advantages can only be realized to the full extent in the solution of various applied problems if dyed matrices with sufficient stability to the action of light are created. The aim of the present review was therefore to analyze, classify, and generalize methods of creating such matrices. FACTORS GIVING RISE TO THE DEGRADATION OF DYED POLYMERS DURING THE ACTION OF LIGHTThe presence of absorbing microimpurities that are heated by radiation are responsible for the radiation damage of optically transparent polymers. Purification from such inclusions at the monomer stage leads to a substantial increase in the threshold of radiation damage in the obtained polymer. For instance, the purification of methylmethacrylate (MMA) by repeated slow distillation raises this threshold of polymethylmethacrylate (PMMA) from several times [16] to two orders of magnitude [17]. 0040-5760/09/4503-0143

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Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

See 2 more Smart Citations

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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“…22 There have been several reports in which semiconductors were applied to the polymerization of vinyl monomers under UV light. [23][24][25] Zhang et al 21 reported the polymerization of N,Ndimethyl acrylamide using semiconductor NPs as the initiator under sunlight. Also, Bao et al 26 carried out the polymerization of N,N-dimethyl acrylamide and 2-acrylamide-2-methyl propane sulfonic acid monomers with a 2,2-diethoxyacetophenone photoinitiator.…”

mentioning

confidence: 99%

Photodegradation of methylene blue with a titanium dioxide/polyacrylamide photocatalyst under sunlight

Kazemi

Mohamadnia

Kaboudin

et al. 2016

J of Applied Polymer Sci

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Hydrogels containing TiO 2 nanoparticles (NPs) have photocatalytic properties and degrade pollutants under light. In this study, a polyacrylamide (PAAm) hydrogel was synthesized with TiO 2 P25 NPs as the initiator, acrylamide as a monomer, and N,N 0 -methylene bisacrylamide as a crosslinker in aqueous media under sunlight. Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy were applied to characterize the TiO 2 /PAAm hydrogel. The effects of different synthetic conditions, such as the initiator concentration, crosslinker, and dilution, on swelling were investigated. The maximum swelling of the TiO 2 /PAAm hydrogel was 45 g/g in the hydrogel synthesized with optimum conditions by 0.2% TiO 2 . The photocatalytic degradability of the hydrogel was investigated with methylene blue (MB) as the pollutant target. Also, the effects of the pH and MB concentration were studied. Under optimum conditions, 95.00% of the MB was degraded by the TiO 2 / PAAm photocatalyst after 5 h of irradiation under sunlight. The comparison of the results with those of the TiO 2 P25 powder showed that the TiO 2 NPs had better activity than the hydrogel, but unlike the hydrogel, the activity of these NPs decreased in each recycling time because of the aggregation of NPs. Finally, the hydrogel was recycled seven times without a considerable reduction in the degradation efficiency.

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Preparation and characterization of OH‐functionalized magnetic nanogels under UV irradiation

Gong¹,

Yu²,

Sun³

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:A novel preparation method of net magnetic polymer nanogels with swollen shell was developed. UVinduced photopolymerization of 2-hydroxyethyl methacrylate (HEMA) was performed in the magnetite aqueous suspension, free of any additive to obtain monodisperse magnetic nanogels with swollen shell. Owing to the step-growth polymerization of the monomer, the particle size of magnetic nanogels can be conveniently manipulated by changing the irradiation time and the volume of the monomer dropped. The crystalline structure of Fe 3 O 4 core and chemical composition of PHEMA magnetic nanogels were characterized by using X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis, respectively. Particle sizes, size distributions of magnetic nanogels in swollen state and dry state were measured by photo-correlation spectroscopy (PCS) and transmission electron microscopy (TEM), respectively. The morphology of swollen magnetic nanogels and that of polymer capsules obtained from magnetic nanogels etched by hydrochloride acid were observed by TEM. The high magnetizations and superparamagnetic behaviors of naked Fe 3 O 4 and magnetic nanogels at room temperature were confirmed by the measurement of hysteresis curves.

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Photoinitiation of buthylmethacrylate polymerization by colloidal semiconductor nanoparticles

Cited by 78 publications

References 34 publications

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Photodegradation of methylene blue with a titanium dioxide/polyacrylamide photocatalyst under sunlight

Preparation and characterization of OH‐functionalized magnetic nanogels under UV irradiation

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