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The role of molecular oxygen in the formation of radiation-engineered multifunctional nanogels
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0003-0596-0222
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2019 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 114, p. 164-175Article in journal (Refereed) Published
Abstract [en]

Nanogels are very promising biomedical nanodevices. The classic “radiation chemistry-based” approach to synthetize nanogels consists in the irradiation with pulsed electron beams of dilute, N 2 O-saturated, aqueous solutions of water-soluble polymers of the “crosslinking type”. Nanogels with controlled size and properties are produced in a single irradiation step with no recourse to initiators, organic solvents and surfactants. This paper combines experimental syntheses, performed with two e-beam irradiation setups and dose-ranges, starting from poly(N-vinyl pyrrolidone) solutions of various concentrations, both in N 2 O-saturated and air-saturated initial conditions, with the numerical simulations of the radiation chemistry of aqueous solutions of a radical scavanger exposed to the same irradiation conditions used in the experiments. This approach provides a methodology to predict the impact of system and irradiation conditions on the water radiation chemistry, which in turn affect the nanogel features in terms of molecular and physico-chemical properties. In particular, the crucial role of initial and transient concentration of molecular oxygen is revealed. This work also proposes a very simple and effective methodology to quantitatively measure the double bonds formed in the systems from disporportionation and chain scission reactions, competing with inter-/intra-molecular crosslinking.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 114, p. 164-175
Keywords [en]
Crosslinking, Kinetic modeling, Mechanism, Nanogel, Water radiolysis
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-246432DOI: 10.1016/j.eurpolymj.2019.02.020ISI: 000467668800019Scopus ID: 2-s2.0-85062017202OAI: oai:DiVA.org:kth-246432DiVA, id: diva2:1300605
Note

QC 20190329

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-06-11Bibliographically approved

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Dahlgren, BjörnJonsson, Mats

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