Polyvinyl Compounds, Others

Hallensleben, Manfred L.

doi:10.1002/14356007.a21_743

Cited by 53 publications

(25 citation statements)

References 77 publications

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“…It is widely used commercially because of its hydrophilicity, biodegradability, and non-toxicity. 35 The freeze-dried Ti 3 C 2 T x nanosheet powder was used to prepare these vacuum-filtered polymer composites at the following ratios: (1) 50-50 wt% Ti 3 C 2 T x to PVA respectively and (2) 10-90 wt% Ti 3 C 2 T x to PVA respectively; both samples were kept under atmospheric conditions for the duration of the experiment. The conductivity of 50-50 wt% Ti 3 C 2 T x /PVA sample was roughly 40% of its original value on the 30 th day and 20% of the original value by the 57 th day.…”

Section: Resultsmentioning

confidence: 99%

Oxidation stability of Ti3C2Tx MXene nanosheets in solvents and composite films

et al. 2019

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Ti 3 C 2 T x belongs to the family of MXenes, 2D materials with an attractive combination of functional properties suitable for applications such as batteries, supercapacitors, and strain sensors. However, the fabrication of devices and functional coatings based on Ti 3 C 2 T x remains challenging as they are prone to chemical degradation by their oxidation to TiO 2. In this paper, we examine the oxidation of Ti 3 C 2 T x in air, liquid, and solid media via conductivity measurements to assess the shelf life of Ti 3 C 2 T x MXenes. The oxidation of Ti 3 C 2 T x was observed in all the media used in this study, but it is fastest in liquid media and slowest in solid media (including polymer matrices). We also show that the conventional indicators of MXene oxidation, such as changes in color and colloidal stability, are not always reliable. Finally, we demonstrate the acceleration of oxidation under exposure to UV light.

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Section: Resultsmentioning

confidence: 99%

Oxidation stability of Ti3C2Tx MXene nanosheets in solvents and composite films

et al. 2019

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“…Due to its interesting optical properties, PVA is considered as one of the most significant commercial polymers. The instability of the vinyl alcohol monomer with respect to acetaldehyde is the reason PVA is prepared by first polymerizing vinyl acetate followed by converting the produced polyvinyl acetate to PVA [5]. Because of * corresponding author; e-mail: rania.7.8.2016@gmail.com its high refractive index, excellent elasticity, lack of color and low cost, PVA has been utilized as a nonlinear optical element, a polymer waveguide and for the replacement of glass in its uses in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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In the present research work a solution casting technique was utilized to fabricate various blends of polyvinyl alcohol (PVA)/polyethylene glycol (PEG). Embedding PEG in PVA resulted in obvious shifts in the absorption edge which points to a decrease in the energy gap values based on PEG content. Loss of the photon energy was a consequence of increasing the extinction coefficient at high wavelengths. The PEG content increased the refractive index of the PVA in the produced PVA/PEG blends. The direct and indirect energy gap values were decreased whereas the Urbach energy values were increased with increasing the PEG content. The exact electron transition which is responsible for the absorption process was determined successfully based on the complex optical dielectric functions. In addition, some other optical parameters were estimated to more understand fully the effect of embedding the PEG in the PVA. The Fourier transform infra red spectroscopy was used to determine the characteristic functional groups of both the PVA and the PEG.

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“…Thus, the molecular structure of PVB is mainly composed of butyraldehyde acetal groups, vinyl alcohol hydroxyl groups and about 2% acetate groups derived from the precursor vinyl acetate [20]. The balance between the cyclic acetal structures and the OH groups determines the final properties of the PVB [20, 27, 28].…”

Section: Resultsmentioning

confidence: 99%

Isolated left pulmonary artery: Interventional stenting of a persistent fifth aortic arch

Koch

Ludwig

Zink

et al. 2007

Cathet Cardio Intervent

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A few cases of isolated pulmonary artery have been successfully palliated by stenting the arterial duct using coronary stents. However, progressive luminal narrowing within the stent due to neointimal proliferation and peal formation is a considerable problem. We report the successful interventional palliation in a 7-week-old infant with isolated left pulmonary artery using sirolimus-eluting stents. In this unusual case, the isolated pulmonary artery was supplied by a duct-like remnant of a persistent fifth aortic arch, whereby the distal part of this vessel showed severe constriction. Implantation of two sirolimus-eluting coronary stents re-established good perfusion of the left pulmonary artery. Seven months after the procedure, echocardiography revealed that perfusion of the stented vessel and the left pulmonary artery was still very good. Stents eluting antimitotic agents also help to preserve the patency of small vessels in infants, and may be useful for ductal stenting.

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Polyvinyl Compounds, Others

Abstract: The article contains sections titled: 1. Poly(Vinyl Alcohol) 1.1. Structure and Crystallinity … Show more

Cited by 53 publications

References 77 publications

Oxidation stability of Ti3C2Tx MXene nanosheets in solvents and composite films

Oxidation stability of Ti3C2Tx MXene nanosheets in solvents and composite films

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Isolated left pulmonary artery: Interventional stenting of a persistent fifth aortic arch

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