Principles of designing nanostructured polymeric catalysts: Mesoscopic simulation

Комаров, П. В.; Khalatur, Pavel G.; Khokhlov, Academician A. R.

doi:10.1134/s0012501615090092

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In the structure, the core consists mainly of thermosensitive units, while ionic groups are mostly located at the exterior of the particle. Based on the modeling of the thermo-induced precipitation copolymerization process [31,36], differences in hydrophobicity, copolymerization kinetics, and mono mers reactivity could lead to inhomogeneous distributions of radial ionic groups within the polymer globule or gel particles. In this case, the collapse of the whole particle should be governed by the collapse of the microgel core consisting only of the thermosensitive homopolymer.…”

Section: Resultsmentioning

confidence: 99%

1H NMR study of thermo-induced collapse of polyelectrolyte microgels

Kozhunova¹,

Ji²,

Labuta³

et al. 2018

Express Polym. Lett.

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Smart polymer gels of microscale size are attracting a lot of attention since their properties, such as fast response to various external stimuli, make them suitable candidates for many potential applications including drug delivery, nanoreactors, or separation techniques. In this research, thermosensitive microgels of poly(N-isopropylacrylamide), poly(N-vinylcaprolactam), poly(N-isopropylacrylamide-co-sodium vinylsulfonate) and poly(N-vinylcaprolactam-co-1-vinylimidazole) were prepared via aqueous free-radical precipitation polymerization. The thermo-induced collapse of the microgels and subchain mobility were thoroughly investigated by means of proton nuclear magnetic resonance (1 H NMR) spectroscopy, as well as scanning electron microscopy and dynamic light scattering. It was found that in copolymer microgels a part of the thermosensitive monomer units does not collapse upon heating, and the critical temperature is not affected strongly by the addition of ionogenic groups. That could be explained by non-uniform monomer unit distribution, leading to the appearance of thermosensitive core-charged corona structure of the microgel particle. Сore-corona architecture of microgels results in film formation with the ordering of the self-assembly structure.

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Section: Resultsmentioning

confidence: 99%