نتایج جستجو برای: poly ethylene oxide

تعداد نتایج: 271849  

2003
Berend-Jan de Gans Beate Müller Simone Wiegand

Results on thermodiffusion of poly~ethylene oxide! and colloidal boehmite (g-AlOOH! rods in ethanol/water mixtures are presented. Data were obtained using thermal diffusion forced Rayleigh scattering. The sign of the Soret coefficient of the boehmite rods changes from positive to negative with increasing water content, i.e., at sufficiently high water content the colloidal particles move to hig...

2014
Anil Barak Palash Jyoti Das Hemlata Vashisht Sudershan Kumar

The high molecular weight poly (ethylene oxide) was used to synthesize telechelic bromine terminated poly (ethylene oxide) polymers. The low molecular weight polystyrene anion was generated by living anionic polymerization by controlling monomer/initiator ratio. The living polystyrene anion was reacted with telechelic bromine terminated poly (ethylene oxide) polymers to obtain water soluble pol...

Journal: :علوم و تکنولوژی پلیمر 0
سمیه صفی مهران غیاثی محمد مرشد سید عبدالکریم حسینی

in the past decade, electrospinning as a facile and effective means in producing nanofibers with diameters ranging from microns down to a few nanometers has been developed and considered important. in this work, electrospinning of an interesting natural biopolymer, sodium alginate, has been investigated. the results showed that water solution of sodium alginate cannot be electrospun into nanofi...

Journal: :Journal of colloid and interface science 2013
Toshio Sakai Yuya Horiuchi Paschalis Alexandridis Tomohiko Okada Shozi Mishima

We report here on the segment effects of poly(ethylene oxide)-containing block copolymers (PEO-BCP) on the reduction activity for tetrachloride gold(III) ([AuCl(4)](-)), interfacial activity for gold surface, colloidal stability, and morphology of gold nanoparticles formed in aqueous solutions. In particular, the effects of poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO), polyethylene (...

Journal: :iranian chemical communication 0
bahman vasheghani farahani immam khomeini internathional university golamreza rezaei behbahani imam khomeini international university monir shalbafan imam khomeini international university

thermodynamic study on the interaction of β-cd with poly ethylene oxide and poly acrylic acid was performed by isothermal titration calorimetry at 298k. when β-cd is added to the interpolymer complex, competition is created between host-guest and hydrogen bond. enthalpy of interaction between the β-cd and interpolymer complex was calculated using the extended solvation theory. p=1 shows that wi...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2008
Chun Liu Marc A Hillmyer Timothy P Lodge

Miktoarm star triblock copolymers mu-[poly(ethylethylene)][poly(ethylene oxide)][poly(perfluoropropylene oxide)] self-assemble in dilute aqueous solution to give multicompartment micelles with the cores consisting of discrete poly(ethylethylene) and poly(perfluoropropylene oxide) domains. Tetrahydrofuran is a selective solvent for both the poly(ethylethylene) and poly(ethylene oxide) blocks, an...

2012
Débora Cristina Coraça-Huber Eliana Aparecida de Rezende Duek Maurício Etchebehere Luis Alberto Magna Eliane Maria Ingrid Amstalden

OBJECTIVE The aim of this study was to investigate bone repair after the implantation of vancomycin-loaded poly-L-lactic acid/poly-ethylene oxide microspheres compared with vancomycin-unloaded poly-L-lactic acid/poly-ethylene oxide microspheres. METHODS Poly-L-lactic acid/poly-ethylene oxide microspheres were implanted in rat tibiae and evaluated for periods of 2, 4, 8, and 12 days and 4, 8, ...

Journal: :Chemical communications 2009
Helmut Schlaad Liangchen You Reinhard Sigel Bernd Smarsly Matthias Heydenreich Alexandre Mantion Admir Masić

Direct dissolution of glycosylated polybutadiene-poly(ethylene oxide) block copolymers can lead to the spontaneous formation of vesicles or membranes, which on the outside are coated with glucose and on the inside with poly(ethylene oxide).

Journal: :Chemical communications 2010
Eun-Bum Cho Oc Hee Han Sunha Kim Dukjoon Kim Mietek Jaroniec

Imine-containing bridging groups were formed during self-assembly of periodic mesoporous organosilicas by in situ dynamic covalent chemistry of aldehyde and amine groups in the presence of poly(ethylene oxide)-poly(dl-lactic acid-co-glycolic acid)-poly(ethylene oxide) block copolymer in acidic aqueous solutions.

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