On the formation of poly(ethyleneoxide)–poly(vinylalcohol) blends

Mishra, Rachna; Rao, K. J.

doi:10.1016/s0014-3057(98)00283-3

Cited by 62 publications

(38 citation statements)

References 26 publications

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“…There was a sharp, large exothermic peak at 495 °C concurrent with a weight loss of approximately 88%, which indicated the complete decomposition of the nanofiber that agrees with the TG curve ( Figure 4) 22,23 . As shown in Figure 4b, rapid weight loss occurred from 50 to 150 °C in the thermal curves of the PVA/SiO 2 hybrid nanofiber due to the polycondensation of Also on the DTA curve, endothermic peaks were observed at 106, 230, and 485 °C, while exothermic peaks occurred at 221, 390, 478, and 565 °C.…”

Section: Resultssupporting

confidence: 74%

Preparation and characterization of UV-cured hybrid polyvinyl alcohol nanofiber membranes by electrospinning

et al. 2014

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The present study investigated the possibility of preparing polyvinyl alcoholic (PVA) organicinorganic hybrid nanofiber membranes by electrospinning with UV irradiation. To this end, PVA, PVA/SiO 2 organic-inorganic hybrid obtained with Geniosil® XL 33 as a SiO 2 source, and imidazolefunctionalized mesoporous PVA/SiO 2 /N=N nanofiber membranes were synthesized. These membranes were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric-differential thermal analysis, and Brunauer-Emmett-Teller analysis. According to results, fine polymeric nanofibers were obtained in the size range of 100-200 nm for pure PVA nanofibers and 150-250 nm for PVA/SiO 2 hybrid nanofibers, while imidazole-functionalized PVA/ SiO 2 nanofibers were less than 100 nm. The membranes produced are suitable for use in various applications, including filtration and adsorption, in the biomedical and textile industries, among others.

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Section: Resultssupporting

confidence: 74%

Preparation and characterization of UV-cured hybrid polyvinyl alcohol nanofiber membranes by electrospinning

et al. 2014

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“…All formulations prepared with 3% of PVA showed optical transparence and mechanical properties suitable to be easily "peeled" after application (Figure 1a), whereas dispersions with 2% of PVA are too fluids to be handled (Figure 1b). PVA and PEO are not completely miscible [28,29], and to obtain a stable and transparent gel formulation the critical point is the perfect dissolution of the polymers in the common solvent. When dissolution is not complete the gels are opaque and undergo premature syneresis.…”

Section: Resultsmentioning

confidence: 99%

Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfaces

et al. 2015

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Abstract:Poly(vinylacohol) (PVA) is a versatile polymer capable of forming hydrogels useful in a wide range of applications. Hydrogels based on cross-linking of PVA with borax, and able to incorporate organic solvents, have been used in the field of cultural heritage as tool for cleaning the surfaces. Poly(ethylenoxide) (PEO) has been introduced in the formulations of PVA-borax, with the aim of increasing the gel compatibility with organic solvents and of improving the mechanical properties of the materials. The formulations were investigated with rheological characterization, solvent loss measurements and study of the free water through the determination of the Free Water Index. The PEO molecules do not participate in the formation of the network but have been found to be responsible for a decrement of the storage moduli, explained by a spacing between crosslinks and the partial disentanglement of the PVA chains. At the same time PEO produces in the gel an increase of the apparent relaxation time, thus stabilizing the dispersions and enhancing their ability to maintain the shape. Cleaning tests for removal of an acrylic coating on limestone have been also successfully performed.

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“…The most important bands feature of these samples appears to be C-O-C stretching vibration around 1136 cm -1 , and O-H bending vibration at 1328 cm -1 , and C=O stretching vibration at 1567 cm -1 and 1712 cm -1 . The vibrational bands appeared at 2894, and 3304 cm -1 correspond to υ(CH) and υ(OH), respectively [26,27]. In general, the vibrational bands of PVA/PEO blend shows spectrum characterizing of both PVA and PEO polymer.…”

Section: −mentioning

confidence: 91%

Complexion Formation in PVA/PEO/CuCl<sub>2</sub> Solid Polymer Electrolyte

Abdullah¹,

Saber²,

Hamasalih³

2015

ujms

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Solid polymer electrolyte films based on polymer blends of poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO), with different concentration of copper (II) chloride (CuCl 2 ) were prepared using casting technique. Optical studies were performed using Fourier transform infrared (FT-IR) and Ultraviolet-visible (UV-Vis) spectroscopy. The optical properties of these films were varied by varying CuCl 2 concentration. The results show the absorption edge for electrolyte samples shifts toward a lower energy region by increasing the salt concentration, leading to the band gap reduction. The band gap energy data showed that the incorporation of CuCl 2 into the polymeric system causes charge transfer complexes in the blend polymer, which lead to increase in the electrical conductivity, by providing additional charges in the lattice. The PVA/PEO/CuCl 2 solid polymer electrolyte films exhibit good UV shielding properties in the wavelength range from 190 to 400 nm.

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On the formation of poly(ethyleneoxide)–poly(vinylalcohol) blends

Cited by 62 publications

References 26 publications

Preparation and characterization of UV-cured hybrid polyvinyl alcohol nanofiber membranes by electrospinning

Preparation and characterization of UV-cured hybrid polyvinyl alcohol nanofiber membranes by electrospinning

Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfaces

Complexion Formation in PVA/PEO/CuCl<sub>2</sub> Solid Polymer Electrolyte

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