Gelling temperature of polymer journal pdf
WebNov 6, 2024 · Polymer gels have been widely used in high water cut oilfields for profile control and water plugging. It is urgent to develop a gel suitable for the Tahe Oilfield (Temperature: 130 °C, salinity: 2.2 × 105 mg/L) in China. A stable gel was prepared by using an acrylamide (AM)/2-acrylamide-2-methyl propanesulfonic acid … WebJun 22, 2000 · Journal of Applied Polymer Science. Volume 77, Issue 8 p. 1769-1781. ... On the other hand, the gel transition temperature and the thermoreversibility of the copolymeric gels gradually disappeared as the content of the HEMA in the gel was increased. The larger the solvent molecular sizes of polymerization media, the better the ...
Gelling temperature of polymer journal pdf
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Webgins to gel. But this is only an ap-proximate gel point. The problem is this: As the transient gel network struc-ture is forming, stress relaxation is also taking place. So, unless measurements on the gelling sys-tem are made extremely rapidly, the exact time of gelation will be obscured by changes due to stress relaxation. Recent work by H.H ... WebAgar is made of agarose, the component with the greatest gelling ability, and agaropectin, in different proportions, commonly 75% of agarose and 25% of agaropectin. Agarose is a linear and neutral polysaccharide whose linear chains arrange themselves into …
WebFirst, the formation temperature of 20–70°C was simulated using self-made test equipment. N,N-Dimethylaniline (DMA), N,N-dimethylp-toluidine (DMT), and hydroquinone were selected as accelerators to determine gel time … WebJul 27, 2016 · Abstract. Methods for the determination of the gel time, one of the most important technological parameters of polymer resins and prepregs, useful in development of curing processes and quality control, have been discussed.
WebAbstract—Methods for the determination of the gel time, one of the most important technological parameters of polymer resins and prepregs, useful in development of curing processes and quality control, have been discussed. The capabilities and limitations, as well as the accuracy and convenience of use of these methods have been considered. WebJan 20, 2016 · Recently, we successfully designed and fabricated a new class of model networks (that is, tetra-polyethylene glycol (tetra-PEG) gel). 21, 22, 23, 24, 25 Tetra-PEG gels are formed by AB-type...
WebPolymer Journal, Vol. 20, No. 12, pp 1163- I 66 (I 988) NOTES Molecular Weight Distribution of Polyphenylene Sulfide by High Temperature Gel Permeation …
WebNov 1, 1984 · To be effective as a gelling agent above 200 degrees F [93 degrees C, a polymer must (1) be chemically stable, (2) have high intrinsic viscosity at application … simon thelwell harper adamsWebgins to gel. But this is only an ap-proximate gel point. The problem is this: As the transient gel network struc-ture is forming, stress relaxation is also taking place. So, unless … simon the lesserWebTDS-730 Viscosity of Carbopol® Polymers in Aqueous Systems Page 2 of 10 Table 1B: Compendial Status of Polymers Product Trade Name United States USP/NF* Europe (Ph. Eur.) Japan (JPE)1 Carbopol® 971P NF Polymer Carbomer Homopolymer Type A Carbomers Carboxyvinyl Polymer Carbopol® 974P NF Polymer Carbomer … simon themeWebIn this system, gelling of the solution is triggered by change in temperature, thus sustaining the drug release. These hydrogels are liquid at room temperature (20–25°C) and undergo gelation when in contact with body fluids (35– 37°C), due to an increase in temperature. The use of biomaterial whose transitions from sol-gel is simon the magician scriptureWebOct 1, 2012 · Theoretical models describe the gelation as a process of random linking of subunits to larger and larger molecules by formation of an infinite network, where no matter what type of objects are... simon the magician in actsWebIt can be shown that gel swelling is the competition between two forces, one is the osmotic pressure of the polymer solution that favors the take in of solvent and expansion, the other is the restoring force of the polymer network elasticity that favors shrinkage. simon the mega water slideWebGelling temperatures can range from 40 to 100°C [105–212°F]). However, an increase in calcium ion concentration above the concentration required to saturate the polymer (that is, to cross-link all carboxylate groups) lowers both the gel strength and the gelling temperature and may produce an undesirable apple sauce–like structure. simon the leper in mark