151Eu Mössbauer Spectroscopy in La0.48Eu0.29Ca0.33MnO3

Reddy, T. Govardhan; Reddy, P. Yadagiri; Reddy, V. Raghavendra; Gupta, Ajay; Reddy, K. Kondal

doi:10.1007/3-540-29194-6_25

Cited by 9 publications

(13 citation statements)

References 15 publications

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“…In second step, this polysiloxane rubber was copolymerized with acrylic monomers. This hybrid latex showed a better impact-resistance compared to non-hybrid latexes when it was formulated in sealants [12]. Inverted core-shell morphology was obtained when polysiloxane was used in second step [13].…”

Section: Introductionmentioning

confidence: 98%

Optimization and comparison of polysiloxane acrylic hybrid latex synthesis methods

Bas

Soucek

2012

J Polym Res

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Two methods were used to prepare polysiloxanefunctionalized acrylic latexes via emulsion polymerization. Ethyl acrylate and 2-ethylhexyl acrylate were used in both methods as acrylic phase. In the first method, an acrylic core was prepared with addition of a coupling agent, 3-(trimethoxysilyl) propyl methacrylate, after which cyclic siloxane monomer (octamethylcyclotetrasiloxane) was reacted with the coupling agent. In the second method, a silaneterminated polysiloxane (H-PDMS) was reacted with ethylene glycol dimethacrylate, and then copolymerized with ethyl acrylate and 2-ethylhexyl acrylate in a batch emulsion polymerization. Particle size distribution and particle morphology were evaluated by using dynamic light scattering (DLS) and transmission electron microscopy (TEM), respectively. Core-shell morphology was observed in TEM for the first preparation method as proposed. After film formation, surface tension, morphology and dynamic mechanical properties were investigated. Stratification of polysiloxane was examined by Fourier-transform infrared spectroscopy (FT-IR) and energy dispersive X-ray (EDX). Energy dispersive X-ray data indicated that only the second preparation method had higher silicon content at film-air interface than film-substrate interface. In both methods, storage modulus and surface energy of latex films decreased after grafting polysiloxane.

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Section: Introductionmentioning

confidence: 98%

Optimization and comparison of polysiloxane acrylic hybrid latex synthesis methods

Bas

Soucek

2012

J Polym Res

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“…, which is the lowest reported value [10]. Semiquantitative method using GCE was also applied for the determination of benzocaine together with structurally similar compounds existing in the state of solid microparticles [11].…”

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confidence: 99%

Determination of Benzocaine Using HPLC and FIA with Amperometric Detection on a Carbon Paste Electrode

et al. 2011

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A new method for benzocaine determination employing FIA and HPLC with electrochemical detection on a carbon paste electrode was developed. The optimum conditions for the determination were found. Carrier solution for FIA consisted of B-R buffer pH 4 (80 % methanol, v/v) and used flow rate was 1.0 mL min À1. Mobile phase for HPLC consisted of B-R buffer pH 4 (75 % methanol, v/v) with flow rate 0.4 mL min À1 . Working potential of + 1.2 V was employed. Practical applicability of the methods was tested on the determination of benzocaine in selected pharmaceuticals. The results were in agreement with results obtained using spectrophotometric detection and with one exception also with the content declared by the manufacturer.

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“…The varying recystallization conditions such as rate of stirring and cooling, antisolvent addition, refluxing/heating, drying under vacuum, and presence of impurities, along with solvents and/or their mixtures with varying polarity have yielded different forms of efavirenz. The patent literature till date reveals 23 different polymorphic forms of efavirenz, one monohydrate and an amorphous form although there is some ambiguity about the actual number of solid forms (polymorphs and solvates) of this API (Radesca et al, 1999(Radesca et al, , 2004Sharma et al, 2006;Khanduri et al, 2006;Reddy et al, 2006;Dova, 2008). In these patents, inventors have claimed novel solid forms of efavirenz based on XRPD and DSC analysis.…”

Section: Efavirenzmentioning

confidence: 99%