A study of the initiator concentration’s effect on styrene-divinylbenzene polymerization with iron particles

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 reported in the literature and the particle size distribution was more monodisperse when the polymerization was conducted with 5%wt of benzoyl peroxide (BPO).

A novel macroporous polymer–inorganic nanocomposite as a sorbent for pertechnetate ions

“…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 conrmed the presence of all expected elements (C, O, N and Fe).…”

“…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.…”

Microesferas magnéticas à base de poli(metacrilato de metila-co-divinilbenzeno) obtidas por polimerização em suspensão

“…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.…”

“…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].…”

Experimental design to evaluate the efficiency of maghemite nanoparticles incorporation in styrene‐divinylbenzene copolymers

“…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 …”