Sonochemical in Situ Synthesis of Hydroxyapatite in Hdpe and Pmma

Parra, Cristina; González, Gema; Albano, Carmen; D’Amore, Alberto; Acierno, Domenico; Grassia, Luigi

doi:10.1063/1.2989038

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“…The cage effect mainly depends on solvent nature as well as its viscosity and agitation rate of solution. By application of ultrasound irradiation in polymerization media, the agitation rate deeply increases which leads to decreased cage effect .…”

Section: Resultsmentioning

confidence: 99%

Ultrasound-assisted emulsion polymerization of poly(methyl methacrylate-co-butyl acrylate): Effect of initiator content and temperature

2015

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In this study, we propose an efficient method for preparation of large scale, monodisperse poly(methyl methacrylate-co-butyl acrylate) latexes by application of the low power ultrasound irradiation. The effect of polymerization temperature and initiator concentration on the polymerization nature, particle size, and particle size distribution were investigated. Results indicated that the ultrasound pulses in the first minutes of polymerization increase instant free radical to monomer ratio as well mixing efficiency which led to higher monomer conversion, improved polymerization rate (especially at first 15 min of the reaction), and remarkable decrease in molecular weight distribution. Transmittance electron microscopy (TEM) and dynamic light scattering (DLS) revealed that the particle size and particle size distribution were significantly affected, particle size decreased, and more uniform particles were obtained. Dynamic mechanical thermal analysis also showed that the initiator concentration affected glass transition temperature (T g ) of the final copolymers and in the case of ultrasound-assisted emulsion polymerization T g was in a very good agreement with theoretical predictions for copolymerization. POLYM. ENG. SCI., 56:214-221, 2016.

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Section: Resultsmentioning

confidence: 99%