Patent Highlights June–July 2017

Mucke, Hermann Am

doi:10.4155/ppa-2017-0034

Cited by 1 publication

(1 citation statement)

References 45 publications

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“…Dichloromethane (CH 2 Cl 2 , 99,8%, PJSC "Khimprom", Novochebok-sarsk, Russia) and dimethyl sulfoxide (DMSO, 99%, "Component-Reagent", Moscow, Russia) were used. The substances studied as photostabilizers (see Figure 1), 4-methyl-2,6diisobornylphenol (DIBP) and N-isocamphylaniline (NICA), were synthesized using the methods described in [19,20]. The UV spectra of DIBP, NICA, and PLA were obtained at UV-1700 (Shimadzu, Kyoto, Japan) in chloroform solution, in the range of 200-600 nm.…”

Section: Methodsmentioning

confidence: 99%

Isobornyl and Isocamphyl Photostabilizers in Poly(lactic acid)-Based Electrospun Fibers

Belyi,

Kuzivanov,

Fedorova

et al. 2024

Polymers

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In this work, electrospun polylactide fibers with new photostabilizing additives, 4-methyl-2,6-diisobornylphenol (DIBP) and N-isocamphylaniline (NICA), have been tested under the influence of UV-C radiation (254 nm). The changes in the polymers’ chemical structure under UV-C radiation were revealed through the increase in absorption in the 3600–3100 cm−1 region in regard to the FTIR spectra. In the samples that were irradiated for 1 h, the stabilizing effect of the photoprotectors became most noticeable as the difference in the content of the hydroxyl groups in stabilized and the pure PLA reached a maximum. The TG–DSC method revealed that the most sensitive indicator of the irradiation effect was the glass transition temperature (Tg), which persisted after 2 h of irradiation when using photostabilizers and their combinations. The PLA/DIBP(1) and PLA/NICA(1) samples showed the best results in protecting PLA from UV-C radiation based on the Tg values; although, the mixture of DIBP and NICA was not as effective. The chemical structure of the photostabilized PLA samples was studied using NMR, GPC, and Py–GC/MS analysis. The electrospun polylactide fibers were mechanically tested and the effects of the electrospun samples on cell viability were studied.

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Section: Methodsmentioning

confidence: 99%