Macromol. Rapid Commun. 9/2007

Norakankorn, Chaiwat; Pan, Qinmin; Rempel, Garry L.; Kiatkamjornwong, Suda

doi:10.1002/marc.200790018

Cited by 7 publications

(12 citation statements)

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“…These results were also consistent with other work which reported that AIBN was a suitable initiator for emulsion or microemulsion polymerization and more economical than the system using a water soluble initiator 22. For the emulsion polymerization of methacrylate monomers such as 2‐hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA), and butyl methacrylate (BMA), more hydrophobic monomers, the hydrophobic initiators lead to much better polymerization results, with much less coagulum and smaller particles, than the hydrophilic potassium peroxodisulfate 23.…”

Section: Resultssupporting

confidence: 93%

Factorial design of nanosized polyisoprene synthesis via differential microemulsion polymerization

Suppaibulsuk

Prasassarakich

Rempel

2010

Polymers for Advanced Techs

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The synthesis of nanosized polyisoprene latex was carried out by differential microemulsion polymerization using 2, 2′‐Azoisobutyronitrile (AIBN) initiator system under various reaction conditions. A $2_V^{5 - 1} $ fractional factorial experimental design was applied to study the effects of reaction variables: amount of initiator and surfactant, monomer‐to‐water ratio, reaction temperature, and stirring speed on rubber particle size and monomer conversion. The analysis of the results from the design showed the main effects on the observed response and the amount of initiator, reaction temperature and stirring speed in the range of the test had significant effects on polyisoprene particle size. The significant effects on monomer conversion were reaction temperature, stirring speed, and interaction between reaction temperature and stirring speed in the range of the test. The optimum conditions gave highest monomer conversion of 90% and average particle size of polyisoprene of 27 nm. The nanosized polyisoprene was also characterized by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Copyright © 2009 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 93%

Factorial design of nanosized polyisoprene synthesis via differential microemulsion polymerization

Suppaibulsuk

Prasassarakich

Rempel

2010

Polymers for Advanced Techs

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“…The particle size of nanosized PIP decreased with increasing surfactant concentration. The results were similar to those obtained in the preparation of poly(MMA) nanoparticles initiated by AIBN via differential microemulsion polymerization . For the preparation of nanosized PIP with a particle size of around 20 nm, the required surfactant amount could be as low as 0.09 of the isoprene monomer amount by weight.…”

Section: Resultssupporting

confidence: 84%

Synthesis of styrene‐g‐polyisoprene nanoparticles by emulsion polymerization and its effect on properties of polyisoprene composites

Suppaibulsuk

Rempel

Prasassarakich

2011

Polymers for Advanced Techs

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The graft copolymerization of styrene onto nanosized polyisoprene (PIP) was carried out by using cumene hydroperoxide and tetraethylene pentamine as redox initiators. The high conversion and high degree of grafting could be achieved when a small particle was used as the core polymer. The grafting efficiency and monomer conversion increased with increasing reaction temperature and monomer concentration. Transmission electron microscopy indicated that the small PIP nanoparticles were completely coated with polystyrene (PS) by grafting resulting in a core shell morphology of nanosized graft PIP. Nanosized PIP and nanosized PS‐g‐PIP could be used as compatibilizers for vulcanized rubber latex. The addition of nanosized PIP and PS‐g‐PIP strongly influenced the mechanical properties of the natural rubber (NR)‐based compound. Incorporation of nanosized PIP and PS‐g‐PIP resulted in an improvement of the resistance of the compounds to heat aging. Copyright © 2011 John Wiley & Sons, Ltd.

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“…Monodisperse PMMA nanospheres 53 were synthesized by surfactant-free microemulsion polymerization with potassium peroxodisulfate as initiator. 17,65 The monomer and the initiator concentrations were adjusted to obtain nanoparticles with an average size in the order of 300 nm.…”

Section: B Pmma Fluorescent Nanospheresmentioning

confidence: 99%

“…In this article, we present an optical technique that allows the direct measurement of the absolute quantum yield of fluorescent nanoparticles such as zeolite L ͑ZL͒ nanocrystals 2,[20][21][22][28][29][30][31] and poly͑methyl methacrylate͒ ͑PMMA͒ nanospheres 5,17,19,[23][24][25]53,54 both loaded with fluorescent perylene molecules, which are well known for their chemical and photochemical stabilities as well as for their high quantum yield. 5,55 Our experimental method is based on the measurement of the diffuse reflectance ͑DR͒ spectra of fluorescent nanopigments adsorbed on microcrystalline cellulose substrates.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent nanopigments: Quantitative assessment of their quantum yield

Ferrini

Nicolet

Huber

et al. 2010

Journal of Applied Physics

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In the last few years, an intense research effort has focused on the synthesis of fluorescent nanopigments for functional inks, light harvesting, tagging, tracing, ͑bio͒labeling, imaging, and lighting applications. Moreover, combined with dielectric matrices, these fluorescent nanoparticles may open the way to the realization of novel optophotonic devices. In particular, due to the large variety of available organic fluorescent dyes, their encapsulation into either an inorganic or an organic host is a very promising approach to synthesize a large palette of new fluorescent nanopigments. However, since the dye encapsulation may affect the fluorescence efficiency, measuring the quantum yield of fluorescent nanopigments is of paramount importance for the development of any connected application. In this article, we present a diffuse reflectance ͑DR͒ technique that enables the quantitative assessment of the quantum yield of fluorescent nanoparticles such as zeolite L nanocrystals and poly͑methyl methacrylate͒ nanospheres both loaded with fluorescent perylene molecules. Our method is validated by measuring a well known fluorescence standard and by comparing the results obtained for a model zeolite nanopigment with those provided by an alternative DR technique. Reliable and reproducible quantum yield values are obtained for both low-and high-efficiency fluorescent nanoparticles. Our technique can thus enable systematic and quantitative studies that may yield an important insight in the mechanisms affecting the fluorescence efficiency of a large variety of nanopigments.

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Macromol. Rapid Commun. 9/2007

Cited by 7 publications

References 0 publications

Factorial design of nanosized polyisoprene synthesis via differential microemulsion polymerization

Factorial design of nanosized polyisoprene synthesis via differential microemulsion polymerization

Synthesis of styrene‐g‐polyisoprene nanoparticles by emulsion polymerization and its effect on properties of polyisoprene composites

Fluorescent nanopigments: Quantitative assessment of their quantum yield

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