The influence of different porogens with halogen substituents on the pore structure of polydivinylbenzene beads

Liu, Qingquan; Duan, Yinxiang; Zhou, Zhi‐Hua; Wang, Juan; Wang, Mingyu; Shen, Shaohua

doi:10.1016/j.matchemphys.2012.02.039

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…The preparation and characterization of porous micro- and nanopolymeric particles is a very attractive and longstanding research topic in view of the actual and potential applications of such particles. Well-established techniques, mainly based on emulsion and suspension polymerization, allow one to prepare in a controlled manner meso- and microporous particles with porosities higher than 1 cm 3 /g, surface areas in the hundreds of square meters and average diameters ranging from some tenths of micrometers to millimeters [1,2,3,4,5,6]. Recently, this kind of structures has become interesting in the development of drug delivery systems [7,8], catalysts [9,10], enzyme and cell immobilization [11], among others.…”

Section: Introductionmentioning

confidence: 99%

Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization

Sosa¹,

Guillén²,

Saade³

et al. 2014

Molecules

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Abstract:The semicontinuous heterophase polymerization of styrene in the presence of cross-linking and porogen agents was carried out. Latexes with close to 20% solid content, which contained mesoporous nanoparticles with 28 nm in average diameters, up to 0.5 cm 3 /g in porosity and 6-8 nm in pore diameters were obtained. By varying the monomer dosing rate over the micellar solution, an unexpected direct dependence of instantaneous conversion on the monomer dosing rate was found. This was ascribed to the higher average number of radicals per particle attained in the polymerization at the higher dosing rate, which in turn would arise from the higher gel percentage in the polymer. It is believed that the cross-linked chains prevent encounters between radicals, delaying the bimolecular termination reactions and allowing the existence of more than one radical inside the particles, which in turn increases the propagation rate.

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Section: Introductionmentioning

confidence: 99%

Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization

Sosa¹,

Guillén²,

Saade³

et al. 2014

Molecules

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Enrichment of steroid hormones in water with porous and hydrophobic polymer‐based SPE followed by HPLC–UV determination

Zhang

Tong

et al. 2013

J of Separation Science

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There have been great concerns about the persistence of steroid hormones in surface water. Since the concentrations of these compounds in water samples are usually at a trace level, the efficient enrichment of steroid hormones is vital for further analysis. In this work, a porous and hydrophobic polymer was synthesized and characterized. The composition of solvent used as porogen in the synthetic process was shown to have an effect on the morphology of the polymer, which was successfully used as an SPE sorbent for simultaneously enriching steroid hormones in surface water samples. The recoveries of the steroid hormones on the custom-made polymer ranged from 93.4 to 106.2%, whereas those on commercialized ENVI-18, LC-18, and Oasis HLB ranged from 54.8 to 104.9, 66 to 93.6, and 77.2 to 106%, respectively. Five types of steroid hormones were simultaneously measured using HPLC-UV after they were enriched by the custom-made sorbent. Based on these findings, the SPE-HPLC method was developed. The LODs of this method for estriol, estradiol, estrone, androstenedione, progesterone were 0.07, 0.43, 0.61, 0.27, and 0.42 μg/L, respectively, while precision and reproducibility RSDs were <6.40 and 7.49%, respectively.

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The influence of different porogens with halogen substituents on the pore structure of polydivinylbenzene beads

Cited by 2 publications

References 16 publications

Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization

Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization

Enrichment of steroid hormones in water with porous and hydrophobic polymer‐based SPE followed by HPLC–UV determination

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