Results 261 to 270 of about 102,586 (309)
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Journal of Applied Polymer Science, 2006
AbstractA series of waterborne polyurethane (WPU) derived from isophorone isocyanate and poly(tetramethylene glycol) were modified by hydroxyl‐terminated polydimethylsiloxane (HPMS). The solutions were then cast into films named as PUHS. Rheological behavior of the emulsions were studied using Rheometer and morphology was studied with transmission ...
Guiqiang Fei +3 more
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AbstractA series of waterborne polyurethane (WPU) derived from isophorone isocyanate and poly(tetramethylene glycol) were modified by hydroxyl‐terminated polydimethylsiloxane (HPMS). The solutions were then cast into films named as PUHS. Rheological behavior of the emulsions were studied using Rheometer and morphology was studied with transmission ...
Guiqiang Fei +3 more
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Physical Chemistry Chemical Physics, 2014
The effects of polydimethylsiloxane (PDMS) on phase separation, optical transmittance and surface properties including surface composition, morphology and wettability of waterborne polyurethane (WPU) containing PDMS were investigated. After the introduction of PDMS into the WPU backbone by polymerization, the large difference in the solubility ...
Zhaofeng, Wu +5 more
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The effects of polydimethylsiloxane (PDMS) on phase separation, optical transmittance and surface properties including surface composition, morphology and wettability of waterborne polyurethane (WPU) containing PDMS were investigated. After the introduction of PDMS into the WPU backbone by polymerization, the large difference in the solubility ...
Zhaofeng, Wu +5 more
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Polydimethylsiloxane (PDMS)-based antifoams
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1997The most widely used industrial antifoams are based on polydimethylsiloxane (PDMS) oils, yet very little fundamental information exists for these products. In most formulations hydrophobically modified particles are dispersed in the oil to increase antifoam efficiency but the primary mechanism responsible for this effect has remained unclear.
V. Bergeron +5 more
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Polysulfone–polydimethylsiloxane block copolymers
Journal of Polymer Science Part A-1: Polymer Chemistry, 1971AbstractAlternating block copolymers have been synthesized from dihydroxyl‐terminated polysulfone and bis(dimethylamine)‐terminated polydimethylsiloxane oligomers. The products are soluble, amorphous, and transparent, and display excellent thermal and hydrolytic stability. Elastomeric and rigid compositions can be prepared by varying oligomer molecular
A. Noshay, M. Matzner, C. N. Merriam
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Thermodynamics of polydimethylsiloxane solutions
Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1973Solvent chemical potentials and heats of dilution have been obtained for systems containing polydimethylsiloxane and solvents comprising normal and branched alkanes, aromatic hydrocarbons and dimethylsiloxane oligomers. Using the Flory–Huggins approximation to eliminate the combinatorial contribution to ΔSM, the results are expressed as concentration ...
Ramlal S. Chahal +2 more
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Polyurethane/polydimethylsiloxane segmented copolymers
European Polymer Journal, 1999Abstract New polydimethylsiloxane-containing segmented block copolyurethanes were obtained from aromatic or aliphatic diisocyanates, 1,4-butanediol and poly(ethylene glycol)adipate using a multistep polyaddition process. The polydimethylsiloxane–polyurethane elastomers were characterized by IR and NMR spectroscopy, DSC, WAXD and TEM measurements ...
A Stanciu +5 more
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Environmental Occurrence of Polydimethylsiloxane
Environmental Science & Technology, 1997An extensive monitoring program was conducted to determine the occurrence of polydimethylsiloxane (PDMS) in environmental compartments impacted by consumer waste disposal practices. Eight wastewater treatment plants, representative of those found in North America, were monitored to determine PDMS removal during wastewater treatment.
N. J. Fendinger +3 more
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Injectable polydimethylsiloxane-hydroxyapatite composite cement.
Bio-medical materials and engineering, 2003An injectable polydimethylsiloxane/hydroxyapatite (PDMS/HAp) composite cement was synthesised using linear PDMS and HAp (particles of about 100 nm in size) of different mass fractions. The effect of HAp mass fraction (5-60 mass%) on the hardness of PDMS/HAp composite cement was investigated. The hardness achieved is 25-49 degrees ShA.
Ignjatović, Nenad +3 more
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Elasticity of Polydimethylsiloxane Melts
Nature, 1968THE observation of Mieras and Van Rijn1 that the steady shear flow compliance of polymer melts is dependent only on the width of the molecular weight distribution, characterized by Mz/Mw, is in accord with our similar measurements on polydimethylsiloxane melts.
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