Thermal behavior of poly(acrylic acid)–poly(vinyl pyrrolidone) and poly(acrylic acid)–metal–poly(vinyl pyrrolidone) complexes

Moharram, M. A.; Khafagi, Monazah G.

doi:10.1002/app.24367

Cited by 37 publications

(30 citation statements)

References 10 publications

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“…Those peaks are attributed to fragments which results in the breakage of b-glycosidic bonds between glucosamine and N-acetyl-D-glucosamine; similar observations regarding Cs thermal degradation were reported by Lopez et al [26]. The thermal degradation of the hydrogel based on NMACs and PAA (HEA0), as TG analysis revealed, followed four stages: (1) water evaporation, (2) depolymerization of Cs and dehydration of the acid groups forming anhydride, (3) decarboxylation of maleoyl groups and decomposition of anhydrides resulting in unsaturated derivatives, and PAA chain scission [27][28][29]. Fig.…”

Section: Tg/ms/ftir Studiessupporting

confidence: 63%

Thermal behavior of hydrophobically modified hydrogels using TGA/FTIR/MS analysis technique

et al. 2015

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Section: Tg/ms/ftir Studiessupporting

confidence: 63%

Thermal behavior of hydrophobically modified hydrogels using TGA/FTIR/MS analysis technique

et al. 2015

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“…In neat PVP samples initial weight loss nearly around 19% below 100°C revealed the hydrophilic nature of PVP. PVP also shows one step degradation process and the degradation begins at 302°C and ends at 485°C as suggested in the literature [28]. Thermal behavior of PCL blended PVP obeys the single step degradation like PCL and PVP.…”

Section: Thermo Gravimetric Analysissupporting

confidence: 61%

Centrifugal spun ultrafine fibrous web as a potential drug delivery vehicle

Mary¹,

Thinakaran²,

Suganya³

et al. 2013

Express Polym. Lett.

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Abstract.Centrifugal spinning (C-spin) is one of the emerging techniques for the production of ultrafine fibrous web which mimics Extracellular matrix (ECM). Due to its unique characteristic features it is widely used in bio-medical applications such as tissue engineered scaffolds, wound dressing materials and drug delivery vehicles. In the present study tetracycline loaded polycaprolactone (PCL) blended polyvinyl pyrrolidone (PVP) fibers were fabricated using in-house built C-spin system. The developed ultrafine fibers were morphologically characterized by Scanning Electron Microscope (SEM) before and after drug release and the results showed that the developed webs were highly porous and the pores were evenly distributed. Fourier Transform Infrared (FTIR) spectroscopy results confirmed that the drug was incorporated on the fibers. The antibacterial activity and drug releasing strategy were examined and the results showed that the developed webs can effectively act as a drug delivery vehicle.

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“…40 The three weight losses observed for the PAA/Ce(NO 3 ) 3 and PAA/Ce(NO 3 ) 3 /SiO 2 fibers are consecutive to the elimination of adsorbed water, the dehydration of cerium nitrate and degradation of PAA, and the conversion of anhydrous Ce(NO 3 ) 3 to CeO 2 (at increasing temperature). 41 Since the mass of the materials remains unchanged around 600°C, the calcination temperature was fixed at this temperature.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Hierarchically Structured Metal Oxide/Silica Nanofibers by Colloid Electrospinning

Horzum

Muñoz‐Espí

Glaßer

et al. 2012

ACS Appl. Mater. Interfaces

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We present herein a new concept for the preparation of nanofibrous metal oxides based on the simultaneous electrospinning of metal oxide precursors and silica nanoparticles. Precursor fibers are prepared by electrospinning silica nanoparticles (20 nm in diameter) dispersed in an aqueous solution of poly(acrylic acid) and metal salts. Upon calcination in air, the poly(acrylic acid) matrix is removed, the silica nanoparticles are cemented, and nanocrystalline metal oxide particles of 4−14 nm are nucleated at the surface of the silica nanoparticles. The obtained continuous silica fibers act as a structural framework for metal oxide nanoparticles and show improved mechanical integrity compared to the neat metal oxide fibers. The hierarchically nanostructured materials are promising for catalysis applications, as demonstrated by the successful degradation of a model dye in the presence of the fibers. KEYWORDS: catalysis, ceria, electrospinning, lithium cobalt oxide, metal oxide, nanoparticles ■ INTRODUCTIONBecause of their large ratio of surface area to volume and interconnected porosity, metal oxide meshes have been proposed for applications in catalysis, energy storage, and sensors.1−3 Various bottom-up approachessuch as vapor− liquid−solid (VLS) 4 and vapor−solid (VS) 5 growthand topdown techniquessuch as nanocarving 6 and electrospinning 7 have been described. Among these techniques, electrospinning is probably the most versatile, because it allows the fabrication of fibrous mats from a wide variety of both organic and/or inorganic materials. 8,9 Moreover, it allows for control over the diameter, morphology, porosity, alignment, and composition of the resulting fibers. 10,11Calcination of electrospun mats obtained from metal oxide precursors is a commonly used approach because of its facility and potential for upscaling. The calcination process is usually applied to mixtures of polymers/metal oxide precursors and it is based on an oxidative conversion of the polymeric component by heat treatment. There are many successful examples in literature for the fabrication of inorganic fibers by calcination of precursor materials prepared by sol−gel, 12−18 polymer-based sol−gel processes, 19−22 or from electrospinning of polymer dispersions in the presence of ex situ formed colloids.23−27 Upon increase of the temperature, metal oxide crystals nucleate and grow while the polymeric component undergoes degradation. 28,29 In the electrospinning of inorganic precursor, one has to take into account that the calcination leads almost automatically to a shrinkage of the fibers because the polymer template is removed. After calcination, the nanofibers are usually more brittle 30 because of their thinner section and the internal stress generated by the shrinkage. Therefore, an additional material that is not mechanically or chemically affected by the calcination process needs to be incorporated in the fibers during the electrospinning.The recently reviewed electrospinning of colloids 31 has been explored for the ...

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Thermal behavior of poly(acrylic acid)–poly(vinyl pyrrolidone) and poly(acrylic acid)–metal–poly(vinyl pyrrolidone) complexes

Cited by 37 publications

References 10 publications

Thermal behavior of hydrophobically modified hydrogels using TGA/FTIR/MS analysis technique

Thermal behavior of hydrophobically modified hydrogels using TGA/FTIR/MS analysis technique

Centrifugal spun ultrafine fibrous web as a potential drug delivery vehicle

Hierarchically Structured Metal Oxide/Silica Nanofibers by Colloid Electrospinning

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