نتایج جستجو برای: Poly vinyl alcohol

تعداد نتایج: 201707  

Journal: :علوم و تکنولوژی پلیمر 0
امیرحسین نوارچیان سعید موسی زاده

poly(vinyl acetate) is synthesized via solution polymerization, and then it is converted to poly(vinyl alcohol) by alkaline alcoholysis. the aim of the work study was to investigate statistically the  influence of reaction variables in vinyl acetate polymerization, the conversion of this monomer to polymer, degree of branching of acetyl group in poly(vinyl acetate), as well as the molecular wei...

Journal: :journal of paramedical sciences 0
esmaeil biazar department of biomaterials engineering, tonekabon branch, islamic azad university, tonekabon, iran. davood zaeifi proteomics research center, shahid beheshti university of medical sciences, tehran, iran. saeed heidari keshel eye research center, farabi eye hospital, tehran university of medical sciences, tehran, iran sanaz ojani department of biomaterials engineering, tonekabon branch, islamic azad university, tonekabon, iran. arefeh hajiaghaee department of biomaterials engineering, tonekabon branch, islamic azad university, tonekabon, iran. roya safarpour department of biomaterials engineering, tonekabon branch, islamic azad university, tonekabon, iran.

poly vinyl alcohol/chitosan nanofibrous mat were prepared by electrospinning method with suitable pore sizes as potential matrices for soft tissue engineering. the designed scaffolds by electrospinning method evaluated by differentanalyses such morphological, mechanical, and cellular analysis.microscopic results showed diameters of poly vinyl alcohol/chitosan nanofibers were approximately 150 n...

Journal: :nanomedicine journal 0
raheleh faridi-majidi nanotechnology and advanced materials department, materials and energy research center, karaj, alborz, iran nader nezafati nanotechnology and advanced materials department, materials and energy research center, karaj, alborz, iran mohammad pazouki nanotechnology and advanced materials department, materials and energy research center, karaj, alborz, iran saeed hesaraki nanotechnology and advanced materials department, materials and energy research center, karaj, alborz, iran

objective(s): three-dimensional structures such as nanofibrous scaffolds are being used in biomedical engineering as well as provide a site for cells to attach and proliferate leading to tissue formation. in the present study, poly(vinyl pyrrolidone) (pvp)/ poly(vinyl alcohol)(pva) hybrid nanofibrous scaffold was synthesized by electrospinning. materials and methods: the effect of adding nano h...

The Poly (vinyl alcohol)/Kefirane nanofiber membrane was successfully fabricated for the firsttime using electrospinning of the polyvinyl alcohol (PVA) and Kefirane blend solution. Scanningelectron microscope (SEM), attenuated total reflectance Fourier transform infrared (ATRFT-IR), and differential scanning calorimetry (DSC) were used to characterize the electrospunPoly (vinyl alcohol)/Kefiran...

Journal: :international journal of nanoscience and nanotechnology 2011
a. doustgani e. vasheghani-farahani m. soleimani s. hashemi-najafabadi

nanofibrous scaffolds produced by electrospinning have attracted much attention, recently. aligned and random nanofibrous scaffolds of poly (vinyl alcohol) (pva), poly (ε-caprolactone) (pcl) and nanohydroxyapatite  (nha) were fabricated by electrospinning method in this study. the composite nanofibrous scaffolds were subjected to detailed analysis. morphological investigations revealed that the...

Journal: :modares journal of medical sciences: pathobiology 2009
mohammad ali shokrgozar fatemeh mottaghitalab vahid mottaghitalab mehdi farrokhi ali eslamifar

objective: tissue engineering is an (interdisciplinary field that applies polymeric scaffolds to control tissue formation in three-dinemtion (3d). the scaffold provides the microenvironment (synthetic temporary extracellular matrix) for regenerative cells, supporting cell attachment, proliferation, differentiation, and neo tissue genesis due to their suitable chemical, physical and biological s...

Journal: :modares journal of medical sciences: pathobiology 2010
fatemeh mottaghitalab vahid mottaghitalab mehdi farokhi nasim amiralian ali eslamifar

objective: nowadays, as the field of neural tissue engineering advances, the fabrication and application of combined structures open a new window of research for the regeneration of nervous system injuries. in this study, chitosan/poly(vinyl alcohol)-carbon nanotube nanocomposites has been exploited as scaffolds. materials and methods: electrospinning was used to fabricate chitosan/poly(vinyl ...

Journal: :journal of nanostructures 2015
m. goudarzi d. ghanbari m. salavati-niasari

al(oh)3 nanoparticles were synthesized by a simple precipitation reaction. the effect of various amines like ethylene diamine, propylene diamine, triethylenetetramine and tetraethylenepentamine as precipitating agents on the morphology of al(oh)3 nanostructures was investigated. the influence of al(oh)3 nanoparticles on the flame retardancy of the poly vinyl alcohol (pva) matrix was studied usi...

2011
ANDRES BERNAL IVO KURITKA PETR SAHA

Poly(vinyl alcohol) and poly(vinyl pyrrolidone) were blended and films were obtained by casting method. Glutaraldehyde, hydrochloric acid and lactic acid were added to investigate their effect on mechanical properties, swelling and solubility of the blends with the aim to find a possible material candidate for medium or long term implants. Combination of all three additives (lactic acid, glutar...

Journal: :iranian journal of pharmaceutical sciences 0
zahra fahimi biomedical engineering faculty, amirkabir university of technology, tehran, iran maryam parviz biomedical engineering faculty, amirkabir university of technology, tehran, iran fariba orang biomedical engineering faculty, amirkabir university of technology, tehran, iran shahin bonakdar biomedical engineering faculty, amirkabir university of technology, tehran, iran

in this research, hydrogels based on poly vinyl alcohol and poly acrylic acid blend were prepared which were cross-linked by applied thermal conditions. afterward, effects of time and heating on water uptake were investigated. the highest water uptake value exhibited by the sample that was heated for 20 min. at 110 ºc was about 2129% after 4 days at equilibrium state. hydrogels exhibited ph-sen...

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