Styrene‐divinylbenzene copolymers II. Influence of the nature of the diluent on the texture of macroporous copolymers

Abstract

Macroporous styrene-divinylbenzene resins are studied using precipitating agents as diluents. A definition of the macroporous domain is given, based on homogeneous properties and structures. The existence of this macroporous domain is proved to be a general feature of the macroporous resins field. The position of this domain is specified for 4 different diluents. The evolution of the texture of the resins, according to their position inside or outside the macroporous domain is analyzed and discussed. RESUME:Les resines macroporeuses styrene-divinylbenzene preparees en presence d'agents reticulants comme porogenes ont ete etudiees. Une definition du domaine macroporeux est donnee en se fondant sur l'homogeneite des proprietes et des structures. L'existence de ce domaine macroporeux apparait comme un des traits caracteristiques des resines macroporeuses. La position de ce domaine est donnee pour 4 porogenes differents. L'evolution de la texture des resines est analysee et discutee en fonction de leur localisation a I'interieur ou a l'exterieur du domaine macroporeux.

Synthesis and characterization of reactive macroporous poly(glycidyl methacrylate‐triallyl isocyanurate‐ethylene glycol dimethacrylate) microspheres by suspension polymerization: Effect of synthesis variables on surface area and porosity

“…It clearly demonstrates the highly reticular, three dimensional porous matrix of the bead, which was formed by clusters of globules and numerous interconnected channels and pores. The globules in the bead are formed by the agglomerations of microspheres and microspheres are made by the coagulations of nuclei 34. The pores show a rather large size distribution and appear to be interconnected by numerous channels in the pores walls, and pore diameter reaches up to 4 μm, moreover, globules having diameter in the range 100 to 300 nm can also be observed.…”

“…A number of studies have been performed concerning the effects of variations in the concentration and type of diluent used 1, 34–37. For oil in water systems, the porogenic diluents are generally saturated hydrocarbons, aliphatic alcohols, and carboxylic acids.…”

Synthesis and characterization of styrene-divinylbenzene loaded with di(2-ethylhexyl)phosphonic acid. I. Influence of diluent mixture on the porous structure of the copolymer

“…Based on eq. (1), 15 which shows the relawith the polymer chains. Thus, an increase of phase separation during the copolymer synthesis tion between pore volume and surface area, we can suggest that, probably, an accentuated inhas probably occurred.…”

Resinas poliméricas para separação e pré-concentração de chumbo

“…Entre esses estão a concentração do agente de reticulação, a relação entre a quantidade de diluente e de monômero (grau de diluição) e a afinidade do polímero pelo solvente, ou seja, o poder solvatante do diluente. A combinação desses fatores torna possível a obtenção de estruturas variadas, com a porosidade desejada para um determinado fim [84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99] . A porosidade, o grau de ligações cruzadas e o tamanho das partículas do suporte influenciarão diretamente a velocidade da reação de extração, já que se trata de um processo controlado pela difusão da solução iônica através da matriz polimérica.…”