Just fill in the form below, click submit, you will get the price list, and we will contact you within one working day. Please also feel free to contact us via email or phone. (* is required).
2019-12-1 · In contrast simultaneous thermal analysis can be applied to determine the effective PAM content in smectite-PAM composites. At the same time, information on the thermal stability of PAM and of smectite-PAM composites are available. Tutas et al. (1987) studied the decomposition of polyacrylamide (PAM) up to 600 °C under N 2 using simultaneous ...
Get Price2020-7-14 · The thermal gelation behavior and performance evaluation of High Molecular Weight Nonionic Polyacrylamide and Polyethyleneimine mixtures for indepth Water Control in Mature Oilfields Yi Qin 1, Ruiquan Liao 2, Shunshe Luo 1,*, and Junliang Li 2 1 Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, 430100,
Get Price2016-12-1 · In order to observe the stability of acrylamide-based polymers in acid, the above four types of prepared polymers were assembled into eight polymer solutions (two replications of each polymer type), with viscosity ranging from 10 to 30 cp. Hydrochloric acid was then added to the eight polymer solutions to comprise 1 wt% HCl and 10 wt% HCl ...
Get Price2020-9-17 · model of gelation time, and the compatibility, microstructure, thermal stability, and plugging capacity of this gel system were evaluated for water control treatment. 2. Materials and Methods 2.1. Materials The nonionic polyacrylamide (NPAM) was purchased from Guangzhou Shuirun Chemical
Get PriceThe above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: The first process that increases the anionic character of polymers is responsible for the viscosity loss in the presence of monovalent salts and for eventual precipitation in the presence of divalent salts even if the molecular weight is not changed.Such a process ...
Get PriceWe have investigated the effect of temperature on the chemical (hydrolysis) and thermal (molecular weight) stability of purified polyacrylamide solution.From viscosity and light scattering data we show that no polymer degradation due to oxygen contamination results from heating polymer solutions although higher temperature is responsible for hydrolysis of amide groups.
Get Price2009-6-29 · years at 120°C. Within our experimental error, HPAM stability was the same with/without oil (decane). An acrylamide-AMPS copolymer (with 25% AMPS) showed similar stability to that for HPAM. Stability results were similar in brines with 0.3% NaCl, 3% NaCl, or 0.2% NaCl + 0.1% NaHCO3. At temperatures of 160°C and above, the polymers were more ...
Get Price2016-7-9 · The stability mechanism and thermal properties of the system alumina–anionic polyacrylamide (PAM) was studied. The polymer’s adsorption properties in dependence on the following parameters solution pH (in the range 3–9), temperature (in the range 15–35 °C), and carboxyl groups’ content in the PAM chains (in the range 5–30 %) were examined.
Get Price2018-9-7 · High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and …
Get Price2021-7-9 · The composite cross-linker can improve the thermal stability of polyacrylamide gel by improving the strength of the dendritic structure. Rheological testing showed that chromium acetate and phenolic resin can increase the storage modulus (strength) of polyacrylamide gel, with chromium acetate being more efficient than the phenolic resin.
Get PriceOur products include Polyacrylamide Flocculant series: anionic polyacrylamide (APAM), cationic polyacrylamide (CPAM), Nonionic polyacrylamide (NPAM), salt resistant and high temperature resistant polyacrylamide for oil field, instant polyacrylamide, etc.,in which instant polyacrylamide can be directly added without dissolving, with fast flocculation speed, large floc, small dosage and good effect.
Get PriceThe above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: The first process that increases the anionic character of polymers is responsible for the viscosity loss in the presence of monovalent salts and for eventual precipitation in the presence of divalent salts even if the molecular weight is not changed.Such a process ...
Get PriceThe exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.
Get Price2003-9-8 · the thermal stability (50-75 °C) of Aspergillus oryzaeR-amylase immobilized in polyacrylamide gel in phosphate buffer, mashed potatoes, and minced shrimp was examined. Changing the cross-linking agent concentration from 3.3 to 5.3% and adding 2% salt did not markedly affect the thermal stability of the immobilized R-amylase.
Get PriceSewage plant polyacrylamide PAM has a high thermal stability, the C-62 strain produced by polyacrylamide PAM after boiling for 10 minutes and its activity is still 88%. The PAM of the wastewater treatment plant has a good coagulation ability for many kinds of flocculation particles as well as the synthesis of high molecular weight PAM.
Get PriceJun 08, 2011· Water Treatment Chemicals Friday, June 17, 2011. polyacrylamide PAM is a linear polymer, it is soluble in water PAM good thermal stability PAM (PAM) abbreviation Polyacrylamide, is a linear polymers, the application of water-soluble polymer compound is one of the most extensive varieties, PAM and its derivatives can be used as ...
Get PriceChanges in mechanical properties, thermal stability, reducible cross-links and glycosyl-lysines in rat skin induced by corticosteroid treatment. Oxlund H, Sims T, Light ND. The effects of systemic cortisol treatment on the biophysical and biochemical properties of skin were investigated.
Get Price1986-1-30 · Effect of temperature and low pH on structure and stability of matrix porin in micellar detergent solutions. Markovic-Housley Z, Garavito RM. Thermal and low pH stabilities of matrix porin (Omp F) solubilized in the micellar solutions of ionic (SDS) and nonionic detergents were investigated by the methods of circular dichroism, intrinsic ...
Get Price2016-12-9 · The results show that the introduced nonionic surfmer along polymer chain can lead to a strong intermolecular hydrophobic association in water. The viscosity and surface activity increased with the increase of polymer concentration and nonionic surfmer concentration. Additionally, the polymer showed a good thermal stability and good salt tolerance.
Get Price2021-5-23 · Hydrolysis and thermal stability of partially hydrolyzed polyacrylamide in high‐salinity environments - Oliveira - 2019 - Journal of Applied. Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry.
Get PriceThermodynamic stability of polyacrylamide and poly(N,N‐dimethyl acrylamide) ... Thermal degradation to form a radical would require the cleavage of carbon–carbon bonds in the polymer chain; the energy needed for this cleavage was found to depend on the structure of the repeat unit which ranged from low of 72.5 kcal for a rare head‐to ...
Get PriceWe hypothesized that the thermal stability of Moloney murine leukaemia virus reverse transcriptase (MMLV RT) will increase with increases in its ability to bind with a template-primer (T/P). To test this hypothesis, we introduced positive charges into MMLV RT by site-directed mutagenesis at position …
Get PriceAppearance:white powder or granule . Polyacrylamide is, simply called PAM, a water- soluble high polymer and widely used in petroleum, paper-making, metallurgical, textile, chemical and environment protection fields. There are three categories of . anionic, cationic and non-ionic type. Chemicals Nonionic Flocculant NPAM for Mineral Processing
Get PriceThermal Stability. Foam thermal stability was tested in a high-pressure, high-temperature recirculating foam flow loop viscometer. Generally, the viscometer is a 25 ft, 3/10″ ID pipe with a recirculating pump. The water, foaming agent, and other additives are added to …
Get Price2010-9-30 · The retention in porous medium for sulfonated polyacrylamide polymers was measured in core floods using outcrop Berea sandstone. For the studied polymer sacrificial agent may protect polymer structure at high temperature. Higher sacrificial agent concentration gives better thermal stability in both 5 wt % NaCl and SSW solvents.
Get PriceNonionic associative thickeners suitable for use in aqueous coating compositions comprise an aqueous solution polymer of (a) from about 40 percent to about 98 percent, preferably from 60 to 95 percent, by weight of a monoethylenically unsaturated monomer such as acrylamide, N,N-dimethyl acrylamide, vinyl pyrrolidone, hydroxyethyl acrylate and mixtures thereof; and (b) from about 2 percent to ...
Get PriceHydrolysis and thermal stability of partially hydrolyzed Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the ...
Get Price2003-9-8 · the thermal stability (50-75 °C) of Aspergillus oryzaeR-amylase immobilized in polyacrylamide gel in phosphate buffer, mashed potatoes, and minced shrimp was examined. Changing the cross-linking agent concentration from 3.3 to 5.3% and adding 2% salt did not markedly affect the thermal stability of the immobilized R-amylase.
Get Price2019-9-3 · A series of ionic compounds 1,n-dialkyl-3,3′-bis-l-vinylimidazolium bromide (C n VIM) are prepared and employed to crosslink acrylamide for polyacrylamide (PAAM) hydrogel preparation via in situ solution polymerization. The swelling behavior, mechanical properties and thermal stability of the prepared C n VIM crosslinked PAAM hydrogels are investigated.
Get Price2021-7-4 · stability in electrolytes of high salinity. Deng et al. [15] studied the interaction of cationic, anionic, and nonionic polyacrylamides (PAM) with clay minerals. They indicated that anionic PAM had the lowest affinity for the clay surfaces; in other words, it served as …
Get Priceprocessability and thermal stability to those of other commodity plastics, like polyethylene and polystyrene [5]. PVC is thermoplastic and due to its low thermal stability the use of PVC polymer is limited in industry. Several attempts have been made to enhance the thermal stability and mechanical properties of PVC in recent years [6-8].
Get Price2012-3-2 · Polyacrylamide‐calcium carbonate (PAM/CaCO 3) and polyacrylamide‐calcium sulfate (PAM/CaSO 4) nanocomposites were prepared via solution‐mixing technique.The resulting PAM‐based nanocomposites with various CaCO 3 and CaSO 4 nanoparticles contents (0–4% w/w) were investigated. Nanoparticles of CaCO 3 and CaSO 4 were synthesized by in situ deposition technique.
Get PriceCompany Registration: US DUNS Number: 07-930-0068. UK DUNS Number: 222811 636. NAICS: 326150. UK VAT: 265649761. India GST: 03AABCI9814Q1Z6
Get PriceDOWFAX™ anionic products consists of a pair of sulfonate groups on a diphenyl oxide backbone; the hydrophobe may be a linear or branched alkyl group comprised of from six to sixteen carbons. Two sulfonates mean double charge density: a more powerful, durable and versatile surfactant molecule. DOWFAX™ anionic are the right choice for ...
Get PricePartially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the solution can lead to precipitation of this polymer.
Get Price2013-4-8 · In a previous work (Zaitoun, et al., 2012), a study of the shear stability of different EOR polymers was reported.Shear stability was found to directly correlate to chain flexibility. Thus, for a flexible coil such as polyacrylamide, the presence of large monomer groups (e.g. ATBS, NVP) leads to an increase of its rigidity, hence enhancing its shear stability.
Get PriceThe metalloprotease exhibited significant stability in the presence of organic solvents with log P values more than 2.5, nonionic detergents and oxidising agent. An attempt was made to test the synthesis of aspartame precursor (Cbz-Asp-Phe-NH2) which was catalysed by …
Get PriceThe exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.
Get PriceHydrolysis and thermal stability of partially hydrolyzed Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the ...
Get PriceEmpirical Correlations for Viscosity of Polyacrylamide. The conventional polymer such as partially hydrolyzed polyacrylamide (HPAM) is commonly used in the Enhanced Oil Recovery (EOR) processes to control the mobility ratio and to improve the sweep efficiency (Myagchenkov and …
Get PriceDisulfilde bonds and thermal stability in T4 lysozyme ... polyacrylamide gels as described (15). Variants containing the Ile-3 -* Cys-3, Cys-54 -+ Thr-54, Cys-54 -* Val-54, and ... Stability is more rigorously characterized as the free energy of denaturation at a given temperature, AG(T), which may be
Get Price2021-3-12 · Thermal stability is becoming a barrier for silica nanofluid use at high temperatures in several industrial applications including oil fields. Homoagglomeration of SiO2 nanoparticles (NPs), which leads to premature sedimentation of large NP clusters, is one of the reasons for the loss in thermal stability. However, this can be improved by incorporating a thermally conductive co-stabilizer ...
Get Price2016-5-18 · thermal stability, solutions (5% w/v) of hydrolysates and SPI were subjected to heat treatment at 95°C for 60 min followed by centrifugation and determination of protein content in the supernatant using a nitrogen analyzer. Solubility and thermal stability at different protein concentrations (1%, 2.5%, 5%, and 7%) in a black tea beverage
Get Price2021-3-12 · There are several pathways through which a polymer can degrade such as thermal, photoinduced, biological, chemical and mechanical. The thermal degradation process of polymers is widely studied because of both academic and industrial interest. Here we have investigated the kinetics of thermal degradation and structural modification of polyacrylamide ultrathin films as a result of heat …
Get PricePolyacrylamide (PAM) is a linear polymer with good thermal stability. It can be dissolved in water in any proportion as polyacrylamide water treatment, and the aqueous solution is a uniform and transparent liquid. 1、Anionic polyacrylamide contains a certain number of polar groups in its molecular chain.
Get PriceThermal Stability of Polyacrylamides in Oilfield Brines Containing Ca2+, Ions. In the absence of oxidative degradation, it has been well established that the backbone chain of vinyl polymers, such as polyacrylamide, is quite thermally stable to temperatures as high as 120 degrees C [248 degrees F].
Get Price2019-7-30 · 2.1. Materials. The used polymer in this study is nonionic polyacrylamide (PAM) that was obtained from Sigma-Aldrich. It is in powder form with a pH of 6 and was used as provided. The molecular weight of PAM is with average 5,000,000–6,000,000mol. wt. Polyethylenimine (PEI) was used as crosslinker provided by BASF with a pH of approximately 11.7.
Get Price2014-9-9 · Glucoamylase[α-1,4: 1,6-glucan-4: 6-glucohydroease, EC 3.2.1.3] from Rhizopus niveus was entrapped in polyacrylamide gels and adsorbed onto SP-Sephadex C–50 to elucidate the thermostability mechanism of immobilized enzymes. The thermal stability of immobilized glucoamylase entrapped in polyacrylamide gels was enhanced slightly compared with glucoamylase in free solution, and was …
Get Price2010-5-18 · The improved efficiency and stability that immobilizing enzymes was analyzed by placing horseradish peroxidase within a cross-linked polyacrylamide gel. It was then allowed to react with 4-aminoantipyrine-phenol and hydrogen peroxide for short periods of time at both room and elevated temperatures and the rate of reaction measured ...
Get PriceIn the current study, two diverse cellulose models (water only; water, dicyandiamide, melamine and polyacrylamide) are developed and analyzed. Numerous model variables, including the diffusion coefficient of water and cellulose chain distance, are collated, in order to examine the effects of amines on the thermal stability of cellulose.
Get PricePatcharin, R., T. Juming, and A. R. Barbara, “Thermal stability of α-amylase from Aspergillus oryzae entrapped in polyacrylamide gel”, J. Agri. Food Chem. 51: 5462-5466, 2003. has been cited by the following article: ... (BSA) as a modifier was used with glutaraldehyde as a binder to study the activity and thermal stability of ...
Get Price2013-10-7 · as a precursor in the production of several polymers, such as polyacrylamide [1, 19]. High molecular weight polymers can be modified to develop nonionic, anionic, or cationic proper‐ ties for specific uses [1, 20]. Various grades of acrylamide are available with the industrial grade typically with a purity of 98 to 99%.
Get PriceNonionic associative thickeners suitable for use in aqueous coating compositions comprise an aqueous solution polymer of (a) from about 40 percent to about 98 percent, preferably from 60 to 95 percent, by weight of a monoethylenically unsaturated monomer such as acrylamide, N,N-dimethyl acrylamide, vinyl pyrrolidone, hydroxyethyl acrylate and mixtures thereof; and (b) from about 2 percent to ...
Get PriceAnionic PAM Polyacrylamide - ori-chem.com. Chemical Flocculant specification Anionic Polyacrylamide cationic polyacrylamide powder,polyacrylamide powder CAS No. 3. Nonionic PAM is suitable for separating mixed organic and inorganic suspension, the solution is neutral or acid. Get Price
Get PricePerformance Comparisons of Nano-LC Systems, 2013-1-17 · Manufacturers and many researchers tend to report the RSD of only a single peak. The best single-peak RSDs in this study for m/z 582.3 were 0.14% for Waters nanoACQUITY UPLC, 0.33% for Proxeon EASY-nLC, 0.23% for Eskigent nanoLC-Ultra and 0.42% for Eksigent nanoLC-2D, which were all within the manufacturers' specifications and …
Get PriceThe thermal stability properties of cationic modified Ti3C2/PS nanocomposites were improved considerably with the temperatures at 5% weight loss increasing by 20 °C for DTAB-Ti3C2/PS, 25 °C for OTAB-Ti3C2/PS and 23 °C for DDAB-Ti3C2/PS, respectively.
Get PriceThe present invention discloses an ink printing method using an image-recording element which provides an image having excellent image quality and superior dry time comprising the steps of: a) providing an ink image-recording clement comprising a support having thereon at least one image-receiving layer comprising polymeric particles in a polymeric binder, wherein said polymeric particle is ...
Get PriceIn the 30-65-day period after calving, the level of milk progesterone was 2.02-2.08 times higher than that in the 24-29-day postpartum period. After insemination, the level of progesterone in milk increased by 10.77-22.54% compared with the level from cows on days 30-65 after calving.
Get Price