نتایج جستجو برای: polyurethane

تعداد نتایج: 6803  

Journal: :علوم و تکنولوژی پلیمر 0
مهدی باریکانی فهیمه عسکری مجید باریکانی محمد برمر

polyurethane foams are extensively used in different applications such as furnitures and sandwich structures due to better mechanical properties, higher acoustic and damping behavior, higher resistance to hydrocarbon, and aging.with respect to flammability of polyurethane materials and safety precaution in living and working environments there is a vital need to study and investigate published ...

Journal: :international journal of nano dimension 0
e. ghobadi separation processes research group (sprg), department of engineering, university of kashan, kashan, iran. m. hemmati polymer science & technology division, research institute of petroleum industry, tehran, iran. gh. khanbabaei polymer science & technology division, research institute of petroleum industry, tehran, iran. m. shojaei polymer science & technology division, research institute of petroleum industry, tehran, iran. m. asghari separation processes research group (sprg), department of engineering, university of kashan, kashan, iran. energy research institute, university of kashan, ghotb-e-ravandi ave., kashan, iran.

polyurethane/zeolite 13x nanocomposite films were fabricated using solution casting method. the synthesized nanocomposite films were structurally characterized using sem, tga and tensile analysis. sem images showed appropriate distribution of nanocrystalline zeolite particles within polyurethane matrix. better thermal stability of nanocomposite films in comparison to neat polyurethane was shown...

Journal: :journal of chemical health risks 0
and shaabanz najaf i f. manouchehri f.

aqueous polyurethane dispersions (puds) have recently emerged as important alternatives to their solvent-based counterparts for various applications due to increasing health and environmental awareness (green chemistry). anionic polyester-polyurethane dispersions were synthesized by three steps. in the first step, macromonomer diisocyanate having carboxylic acid was prepared by isophorone diiso...

Journal: :Physical chemistry chemical physics : PCCP 2014
Kamal Mohamed Seeni Meera Rajavelu Murali Sankar Jaya Paul Sellamuthu N Jaisankar Asit Baran Mandal

Novel bio-renewable castor oil based polyurethane (PU)-silica nanocomposite films were prepared using castor oil, 1,6-hexamethylene diisocyanate and dibutyltin dilaurate in tetrahydrofuran at room temperature. ATR-FTIR spectra confirm the formation of polyurethane and the presence of silica nanoparticles in the polyurethane matrix. The increase of Si nanoparticle content shifts the peak positio...

Journal: :Journal of biomaterials applications 2017
Suk-Min Hong Jong-Wan Kim Jonathan C Knowles Myoung-Seon Gong

In this study, polycarbonate diol/isosorbide-based antibacterial polyurethane nanofiber fabrics containing Ag nanoparticles were prepared by electrospinning process. Bio-based highly elastic polyurethane was prepared from hexamethylene diisocyanate and isosorbide/polycarbonate diol (8/2) by a simple one-shot bulk polymerization. Ag nanoparticles were formed using simple thermal reduction of sil...

2012
Priya A Nair Parameswaran Ramesh

In this study, a calcium-containing monomer, namely calcium lactate, was used for the synthesis of calcium-containing polyurethane for use in biomedical applications. Ether-based polyurethane was prepared using poly(oxytetramethylene)glycol, hexamethylene diisocyanate and calcium lactate. The prepared polymer was characterized by FTIR spectroscopy, which confirmed the presence of ionic linkages...

ژورنال: مواد پرانرژی 2017

One way to thermal stability and ablation improving of polyurethane elastomers with approach of solid propellant rocket insulation, is use of fillers such as silica particles with property of high ablation. In this study, it was paid to prepare polyurethane-silica composites (16,25 and 38% by weight) and polyurethane-silica nanocomposites (10, 16 and 25% by weight) and then interaction, morphol...

Journal: :iranian journal of pharmaceutical sciences 0
mohammad rafienia medical physics and biomedical engineering department, school of medicine, isfahan university of medical sciences, isfahan, iran atefeh solouck biomaterial department, faculty of medical engeneering, amir kabir university of technology, tehran, iran hamid yeganeh polyurethane department, iran polymer and petrochemical institute, tehran, iran

in order to prepare polyurethane elastomers with acceptable physical properties and good biocompatibility, novel polyurethane networks were synthesized via curing reaction of epoxy-terminated polyurethane prepolymers (eups) with hexamethylene diamine. eups were prepared from reaction of glycidol with nco-terminated polyurethanes (itps). itps were also synthesized from reaction of one equivalent...

Journal: :Family planning perspectives 1999
R G Frezieres T L Walsh A L Nelson V A Clark A H Coulson

CONTEXT Condoms made of latex are not comfortable or appropriate for all consumers. Polyurethane condoms may provide a needed alternative. METHODS In a double-masked study, 805 monogamous couples were randomized to use either the polyurethane condom or the latex condom for six months. Couples recorded the frequency of intercourse, of condom use and of breakage and slippage throughout the tria...

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