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The role of molecul...
The role of molecular oxygen in the formation of radiation-engineered multifunctional nanogels
- Article/chapterEnglish2019
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Elsevier,2019
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LIBRIS-ID:oai:DiVA.org:kth-246432
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246432URI
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https://doi.org/10.1016/j.eurpolymj.2019.02.020DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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QC 20190329
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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.
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Dahlgren, BjörnKTH,Tillämpad fysikalisk kemi(Swepub:kth)u1p1nzfw
(author)
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Sabatino, M. A.
(author)
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Dispenza, C.
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Jonsson, Mats,1967-KTH,Kemi(Swepub:kth)u11mc94v
(author)
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KTHTillämpad fysikalisk kemi
(creator_code:org_t)
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In:European Polymer Journal: Elsevier114, s. 164-1750014-30571873-1945
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