Photoinduced electron transfer polymerization

Timpe, H.‐J.

doi:10.1007/3-540-52379-0_6

Cited by 20 publications

(8 citation statements)

References 126 publications

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“…The quenching of DAR * by monomer and nonradiative deactivation of DAR * disfavor the formation of radicals and slow down the polymerization. [20] The mechanism of photophysical and phochemical processes proceeding in the present system can be summarize as follows (Figure 10):…”

Section: Resultsmentioning

confidence: 99%

On photoinduced polymerization of acrylamide

Capek

2013

Designed Monomers and Polymers

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The solution and micellar polymerizations of acrylamide (Aam) initiated by the photoinitiator DAROCUR 2959 (DAR) under UV-light were studied. Variations of kinetic parameters with DAR and AAm concentrations and with the emulsifier type were followed. Furthermore, the kinetics of AAm polymerization under argon and air atmosphere was investigated. Dilatometry was implemented to follow continuously the fast photopolymerization. The polymerization rate vs. conversion curve of the photoinduced polymerization of AAm was described by two and four nonstationary rate intervals. Variation of the rate of polymerization with conversion was discussed in terms of two types of initiating radicals and the gel effect. They are formed by the decomposition of excited DAR * {DAR…AAm} * or {DAR…O 2 } * exciplexes. The intra-and intermolecular association of polyAAm, the self-assembling of AAm monomers, and the association of PAAm with Aam and cross-linking change the solution polymerization into the dispersion one.

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Section: Resultsmentioning

confidence: 99%

On photoinduced polymerization of acrylamide

Capek

2013

Designed Monomers and Polymers

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“…Silver ions and silver nanoparticles (AgNPs) have been recognized as excellent antimicrobial agents because of their effective biocidal ability and biocompatibility to human cells. , Thus, using pure AgNPs or AgNP/polymer hybrid materials as antibacterial agents has been reported numerous times, which indicates that these materials have a good capability for antibacterial activity. , Here, we combine AgNPs with PNIPAAm on glass surfaces for “smart” antibacterial films by using a one-step photopolymerization method involving a photoinitiator that absorbs UV light (365 nm) to produce free radicals. On the one hand, free radicals can induce polymerization of NIPAAm, whereas on the other hand, the free radicals can also reduce silver ions to silver metal that then coalesce to form silver nanoparticles ,− (Scheme…”

Section: Introductionmentioning

confidence: 99%

Smart Antibacterial Surface Made by Photopolymerization

Yang¹,

Li²,

Stansbury

et al. 2016

ACS Appl. Mater. Interfaces

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Based on the use of photopolymerization technology, a facile and reliable method for in situ preparation of silver nanoparticles (AgNPs) within PNIPAAm functional surfaces is presented as a means to achieve non-fouling, antibacterial films. The surface properties were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), water contact angle and thermogravimetric analysis (TGA). The antibacterial and release properties of the surfaces were tested against E. coli: at 37 ˚C (above the LCST of PNIPAAm), the functional films facilitated the attachment of bacteria, which were then killed by the AgNPs. Changing temperature to 4 ˚C (below the LCST), swollen PNIPAAm chains led the release of dead bacteria. The results showed that AgNPs/PNIPAAm hybrid surfaces offer a "smart" antibacterial capability in response to the change of environmental temperature.

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“…They form polymerisation initiating radicals upon exposure to UV-light [1][2][3][4][5][6] or elevated temperatures. [7 -10] The photochemistry of quinoid monomers is an interesting topic: depending on the reaction partner, the triplet state of quinoid monomers can abstract hydrogen atoms, [3,6] react by electron transfer [4,5] or lead to the collapse of an exciplex into a biradical/zwitterion.…”

Section: Introductionmentioning

confidence: 99%

“…[4,5] The strong electron acceptor maleic anhydride has already been supposed to initiate polymerisation via electron transfer. [2] In the seventies several basic research papers on the optical [12] and EPR-spectra [13 -15] of maleimide-derived radicals and radical ions have provided a sound basis to discriminate between the hydrogen-adduct radical and the radical anion.…”

Section: Introductionmentioning

confidence: 99%