Abstract:This paper describes the preparation of magnetic copolymer obtained from suspension polymerization of styrene (Sty) and divinylbenzene (DVB) in the presence of iron particles treated and not treated with oleic acid. The magnetic copolymers were characterized according to their morphology, particle size distribution and magnetic properties. The results show that incorporation of iron particles significantly changed the particles' morphology. All samples presented higher saturation magnetization than the values … Show more
“…The similar was observed for crosslinked ionic polymers containing strongly 31 and magnetic copolymer obtained from suspension polymerization of styrene and divinylbenzene. 11 Highly developed internal porous structure is advantageous for the metal ions sorption due to the decrease of the mass transfer resistance, facilitation of the metal ions diffusion which consequently provides high adsorption rate and capacity. 32 The SEM-EDS analysis conrmed the presence of all expected elements (C, O, N and Fe).…”
Section: Characterization Of Mpgme and Mpgme-detamentioning
confidence: 99%
“…10 The most important parameters for application of magnetic copolymers are the size, size distribution, morphology, hydrophobicity/hydrophilicity, density of reactive surface groups and magnetic properties. 11 Our previous studies have shown that PGME-deta due to the presence of numerous functional groups (-OH and -NH 2 ) can be used for binding of metal oxo-anion species, like Cr and Mo. [12][13][14] The sorption ability of PGME-deta towards pertechnetate anions was also investigated.…”
A novel magnetic macroporous poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (mPGME) was prepared by suspension copolymerization and functionalized with diethylenetriamine (mPGME-deta).
“…The similar was observed for crosslinked ionic polymers containing strongly 31 and magnetic copolymer obtained from suspension polymerization of styrene and divinylbenzene. 11 Highly developed internal porous structure is advantageous for the metal ions sorption due to the decrease of the mass transfer resistance, facilitation of the metal ions diffusion which consequently provides high adsorption rate and capacity. 32 The SEM-EDS analysis conrmed the presence of all expected elements (C, O, N and Fe).…”
Section: Characterization Of Mpgme and Mpgme-detamentioning
confidence: 99%
“…10 The most important parameters for application of magnetic copolymers are the size, size distribution, morphology, hydrophobicity/hydrophilicity, density of reactive surface groups and magnetic properties. 11 Our previous studies have shown that PGME-deta due to the presence of numerous functional groups (-OH and -NH 2 ) can be used for binding of metal oxo-anion species, like Cr and Mo. [12][13][14] The sorption ability of PGME-deta towards pertechnetate anions was also investigated.…”
A novel magnetic macroporous poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (mPGME) was prepared by suspension copolymerization and functionalized with diethylenetriamine (mPGME-deta).
“…Na etapa onde diferentes tipos de suspensão foram utilizados, foi possível verificar que a utilização da técnica de semissuspensão com balão mostrou-se mais eficiente na manutenção da uniformidade do tamanho das microesferas neste sistema, e que o uso da semissuspensão levou a produção de partículas poliméricas com distribuição de tamanho mais estreita do que uma polimerização em suspensão convencional. Estes resultados estão, também, de acordo com a literatura [4,10] . No estudo onde se utilizou diferentes concentrações de DVB foi verificado que o aumento do teor de DVB (20%) também deslocou de maneira significativa o tamanho de partículas para faixas de tamanho maiores em relação ao polímero com 10% de DVB.…”
Section: Microesferas Magnéticas à Base De Poli(metacrilato De Metilaunclassified
“…Há relatos na literatura de que, assim como o uso da semissuspensão, o uso do iniciador AIBN e do agente estabilizante poli(álcool vinílico)(PVA) colaboram para que o tamanho médio de partículas diminua e a curva de distribuição de tamanho médio de partículas fique mais estreita [4,5,9,10] . Além disso, já é bem conhecido na literatura que microesferas poliméricas magnéticas podem apresentar estado de superparamagnetismo com o uso de maghemita (Fe 2 O 3 ) ou magnetita (Fe 3 O 4 ) [8,11].…”
ResumoMicroesferas poliméricas à base de metacrilato de metila (MMA), divinilbenzeno (DVB) e material magnético foram preparadas via polimerização por suspensão. Foi estudada a influência da polimerização em suspensão ou semisuspensão, concentração de material magnético e concentração de divinilbenzeno sobre as características das microesferas obtidas. As partículas poliméricas foram caracterizadas por espectroscopia vibracional na região do infravermelho por transformada de Fourier (FT-IR), microscopia eletrônica de varredura, analisador de área específica e porosimetria, espalhamento de luz e magnetometria de amostra vibrante. O material magnético também foi caracterizado por FT-IR, além de difratometria de raios X e espectroscopia Mössbauer. Foram obtidas, com sucesso, microesferas poliméricas magnéticas à base de MMA e DVB (P(MMA-co-DVB)-M), contendo partículas magnéticas tanto na superfície quanto no interior da microesfera. As partículas obtidas através de polimerização em semisuspensão apresentaram tamanhos menores e distribuição de tamanhos de partículas mais estreita que as partículas obtidas através de suspensões convencionais. Os compósitos apresentaram um comportamento superparamagnético. As microesferas magnéticas sintetizadas neste trabalho têm potencial para serem modificadas e aplicadas como resinas de troca iônica ou suportes catalíticos.
Palavras-chave: polimerização em suspensão, propriedades magnéticas, metacrilato de metila, divinilbenzeno, material magnético.
AbstractMagnetic polymeric microspheres based on methyl methacrylate (MMA), divinylbenzene (DVB) and magnetic materials were prepared via suspension polymerization. We studied the influence of the suspension or semi-suspension polymerization, magnetic materials and divinylbenzene concentration on the characteristics of the microspheres. Polymeric particles were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy, accelerated surface area and porosimetry analyzer (ASAP), dynamic light scattering (DLS) and vibrating sample magnetometer (VSM). The magnetic materials were also characterized by FT-IR, X-ray diffraction and Mössbauer spectroscopy. Magnetic polymeric microspheres based on MMA and DVB (P(MMA-co-DVB)-M), containing magnetic particles on the surface or inside the microspheres, were successfully obtained. The polymer particles obtained through semi-suspension polymerization had smaller sizes and narrower particle size distribution than particles obtained by conventional suspension. The composites showed a superparamagnetic behavior. The magnetic microspheres synthesized in this work have potential to be modified and applied as ion-exchange resins or catalyst supports.
“…These resins have shown great relevance in the field of research and development due to their wide applicability 2 . These applications include biotechnology, biomedical engineering and medicine, drug segmentation, image enhancement in nuclear magnetic resonance, environmental remediation such as bioremediation of contaminated waters and soils, and in metal separation processes 3–7 …”
Magnetized styrene‐divinylbenzene resins can be obtained by inserting superparamagnetic nanoparticles of maghemite (γ‐Fe2O3) in the polymeric matrix. The incorporation of this nanoparticulate material can be influenced by several factors. The objective of this work was to evaluate the influence of these variables through an experimental design, where three factors were evaluated: cross‐linking degree, initiator content and porogenic agent, at two levels. Subsequently, to evaluate the properties of the synthesized magnetized resins, magnetization curves were plotted using a vibrating sample magnetometer, thermal stability of the magnetized copolymer was determined by thermogravimetric analysis and the morphology was observed by scanning electron microscopy. The highest initiator content produced the greatest synthesis yield, and the presence of toluene had a positive effect on saturation magnetization, indicating that incorporation of maghemite in the polymer matrix and thermal degradation were influenced by higher divinylbenzene content.
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