Flows of dilute hydrolyzed polyacrylamide solutions
The results stress the importance of the solvent properties on the actions of the polymers and on the resultant pressure drop for porous media flows. The addition of salt ions to solutions of partially hydrolyzed polyacrylamides yields onset behavior previously observed for nonionic polymers.
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Analysis of structurally modified polyacrylamides
Caulfield et al. , and references cited therein (e.g. Leung et al., ), have been describing the thermal degradation of polyacrylamides. The compounds are degraded either to glutarimides accompanied with the loss of ammonia or to nitriles by dehydration of the amide groups within the polymer.
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Phosphorus Containing Polyacrylamides as Flame Retardants
Novel polymeric flame retardants based on two acrylamides and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) or 5,5-dimethyl-[1,3,2]dioxaphosphinane-2-oxide (DDPO) are described for several applications in HexFlow® RTM6, a high-performance epoxy resin. Neat resin samples and carbon fiber-reinforced composites were tested for their glass transition temperatures (dynamic mechanical
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polyacrylamide water absorb at sa market | Water Treatment
Properties of Polyacrylamides – polymerdatabase.com. Polyacylamides are high molecular weight water soluble or swellable polymers formed from acrylamide or its derivatives. Their glass transition temperature is well above room temperature (> 400 K). The only commercially important polyacrylamide is poly(2-propenamide) which is simply called
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Study on Properties of Branched Hydrophobically Modified
The properties of polymer solution were characterized; the results of the experiments showed that BHMPAM exhibited the properties of pseudoplastic fluid, and the viscosity of BHMPAM was 345.9 mPa · s (polymer concentration was 1750 mg/L) under the condition of 75°C and 9374 mg/L of salinity.
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Inverse Emulsion Polymerization for the Synthesis of High
Polyacrylamides constitute a class of polymers that can entirely dissolve or swell in water to form a solution or hydrogel, respectively. Free radical polymerization of acrylamide monomer, using both solution and inverse emulsion polymerization, was applied to produce polyacrylamide with various molecular weights. This investigation was focused on the production of polymers with varying
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Temperature Responsive Cellulose-graft-Copolymers via
Well-defined cellulose-graft-polyacrylamide copolymers were synthesized in a grafting-from approach by reversible addition–fragmentation chain transfer polymerization (RAFT). A chlorine moiety (degree of substitution DS(Cl) ≈ 1.0) was introduced into the cellulose using 1-butyl-3-methylimidazolium chloride (BMIMCl) as solvent before being substituted by a trithiocarbonate moiety resulting
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Research Article Study on Properties of Branched
polyacrylamide s properties and its applications in high tem-perature and salinity reservoirs, HPAM should be modi ed to change the viscosifying way. In this paper, we synthesized a new branched hydrophobically modi ed polyacrylamide (BHMPAM) and evaluated the properties of the polymer solution. 2. Experiments Involved.. Materials.
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Star-Like Branched Polyacrylamides by RAFT polymerization
In the present study the performance of a series of star-like branched polyacrylamides (SB-PAMs) has been investigated in oil recovery experiments to ultimately determine their suitability as novel thickening agent for enhanced oil recovery (EOR) applications. Hereby, SB-PAMs were compared with conventional linear PAM. The effect of a branched molecular architecture on rheology, and
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EUROPEAN POLYMER JOURNAL - Elsevier
polymers and the relationships between molecular structure and polymer properties. In addition, we welcome submissions on bio-based or renewable polymers, stimuli-responsive systems and polymer bio-hybrids. European Polymer Journal also publishes research on the biomedical application of polymers, including drug delivery and regenerative medicine.
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Polymer | Journal | ScienceDirect.com
Read the latest articles of Polymer at ScienceDirect.com, Elsevier’s leading platform of peer-reviewed scholarly literature
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High‐molecular‐weight hydrolyzed polyacrylamides. I
Read "High‐molecular‐weight hydrolyzed polyacrylamides. I. Characterization. Effect of salts on the conformational properties, Journal of Polymer Science (In Two Sections)" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Get PriceTemperature Responsive Cellulose-graft-Copolymers via
Well-defined cellulose-graft-polyacrylamide copolymers were synthesized in a grafting-from approach by reversible addition–fragmentation chain transfer polymerization (RAFT). A chlorine moiety (degree of substitution DS(Cl) ≈ 1.0) was introduced into the cellulose using 1-butyl-3-methylimidazolium chloride (BMIMCl) as solvent before being substituted by a trithiocarbonate moiety resulting
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1. Introduction - Hindawi Publishing Corporation
The properties of polymer solution were characterized; the results of the experiments showed that BHMPAM exhibited the properties of pseudoplastic fluid, and the viscosity of BHMPAM was 345.9 mPa · s (polymer concentration was 1750 mg/L) under the condition of 75°C and 9374 mg/L of salinity. Moreover, BHMPAM also performed well in viscoelasticity which can meet the property requirements for EOR polymer.
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Interaction and Adsorption of Hydrophobically Modified
The adsorption of polymers affects the cost and oil recovery in oil reservoir exploitation and the flocculation effect in the treatment of oil sand tailings. The adhesion and adsorption of a hydrophobically modified polyacrylamide (HMPAM), i.e., P(AM-NaAA-C 16 DMAAC), on silica and asphaltene were investigated using surface force measurements, thermodynamic analysis and quartz crystal
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DE112006003232T5 - Nanostructured backing paper - Google
Backing paper composition which is substantially cellulose-based and repellent to foreign substances, characterized in that the cellulose fibers in the backing paper composition are at least partially coated with a linear, branched or star-shaped, amphiphilic block copolymer having hydrophilic blocks (a) and hydrophobic blocks (b), wherein - The hydrophilic blocks (a) of the amphiphilic block copolymer are selected from polyethylene oxide, polyvinyl alcohol, polyvinyl acetate
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Journal of Materials Chemistry B - Royal Society of Chemistry
Journal of Materials Chemistry B Tuning of endosomal escape and gene expression by functional groups, molecular weight and transfection medium: a structure–activity relationship study † Friederike Richter , a Liam Martin , a Katharina Leer , a Elisabeth Moek , a Franziska Hausig , a Johannes C. Brendel ab and Anja Traeger * ab
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Developing Cheap and Mass‐Producible Graphite‐Filled Paper
Mechanical and electrical properties were balanced during development. (Jagenberg Paper Systems GmbH, Germany) with one hardened and polished steel roll with a diameter of 150 mm and a softened steel roll covered with polymer with a diameter of 200 mm was used for calendering the paper filled with graphite. Polyacrylamides (PAM) were
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Emulsion Polymerization Mechanism
phobically modi ed polyacrylamides and some observations on rheological properties. European Polymer Journal. 2004; 40 (1):47-56 [38] Freedman HH, Mason JP, Medalia A. Polysoaps.
Get PriceJournal of Polymer Engineering | H-Index - Academic
The latest h-index of Journal of Polymer Engineering is 22.The h-index is defined as the maximum value of h such that the given author/journal has published h papers that have each been cited at least h times. This index can be widely applied to the productivity and impact of a scholarly journal, individual researcher or a group of scientists, such as a department or university or country.
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Cationic starch flocculants as an alternative to synthetic
The cationic polyacrylamides and cationic starches were selected with a wide range of charge densities and molecular weights in order to study the effect of flocculant properties on the flocculation and dewatering performance of the used soils. The optimum dose of each flocculant was determined using the jar test.
Get Price10 years of research impact: top cited papers in Scopus
Scopus is celebrating 10 years since its launch. As the largest abstract and citation database of peer-reviewed literature available today, Scopus boasts 53 million records, 21,915 titles from 5,000 publishers. In this paper we aimed to identify some of the top cited papers indexed in Scopus across various disciplines between 2001 and 2011.
Get PriceTributyltin fluoride polymer | EVISA's Materials
The establishment of EVISA is funded by the EU through the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Get PriceSynthesis and characterization of pH and temperature
Synthesis and characterization of pH and temperature responsive poly(2-hydroxyethyl methacrylate-co-acrylamide) hydrogels (Switzerland). HEMA was purified by passing through a column filled with a HQ/MEHQ resin from Polysciences (Eppelheim, Germany) for inhibitor removing, and immediately before use it was purified by vacuum distillation
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Versatile derivatisation of solid support media
Also, the chemistry warrants the modulation of other surface properties such as charge or hydrophobicity. Preferentially, attachment of nucleic acids takes place only via the terminal amino-group of amino-modified oligonucleotides or the terminal hydroxyl-group of unmodified molecules so that the entire molecule is accessible to probe hybridisation.
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Solubilization of beclomethasone dipropionate
Introduction. In pharmaceutical technology, many drug-releasing and drug-targeting systems have been developed to reduce drug degradation and/or enhance the amount of drug in the target area.1,2 In general, poorly water-soluble agents are usually associated with poor absorption and bioavailability.3 In addition, from a pharmacological point of view, hydrophobicity is beneficial for the drug
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High molecular weight hydrolyzed polyacrylamides. III
The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight (M̄p ≅ 4 × 106) partly hydrolyzed (τ ≅ 31%) polyacrylamide (HPAM‐25) solutions with initial pH values near 4 and 7, respectively, is reported. Potentiometric and spectroscopy data indicate that upon heating the solutions for 16 days the extent of hydrolysis is
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Performance of Bored Piles Constructed Using Polymer
In the United States, AASHTO gives some required properties for polymer fluids, specifying ranges for density, viscosity, pH, and sand content but the suggested lower and upper limits appear to have been directly transferred from material suppliers’ recommendations. It is considered in this paper that these could be further developed.
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Cyclodextrin-induced host–guest effects of classically
Several reports are available on the preparation and properties of thermally responsive polyacrylamides containing azobenzene or stilbene dyes in the side chain . Furthermore, the interaction of dye-containing polymers with CD in water is of some interest, because of their external, light-induced, reversible complexation [1-3,10,11] .
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Re‐evaluation of carrageenan (E 407) and processed
Carrageenan (E 407) and processed Eucheuma seaweed (E 407a) are two of the food additives that composed jelly mini‐cups which were suspended in 2004 by the European Commission to be placed on the market and import (Commission Decision 2004/37/EC, European Commission, 2004), following the measures taken and information provided by different Member States. Jelly mini‐cups are defined as ‘jelly confectionery of a firm consistence, contained in semi rigid mini‐cups or mini‐capsules
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Initial wet web strength of paper | SpringerLink
Despite much research into and development within the complex area of the initial wet web strength of paper, no complete model has yet been developed to describe this property. This type of paper strength is the most important property to ensure an effective paper machine run.
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Detergent Properties and Applications | Sigma-Aldrich
Subtle differences in the physicochemical properties of alkyl glycosides bearing various alkyl chains, attached to a glucose, maltose, or a sucrose head group, can be exploited for selective solubilization of membrane proteins. 10. Zwitterionic Detergents. Zwitterionic detergents have characteristics of both ionic and non-ionic types.
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