| N-isopropylacrylamide-co-acrylamide copolymers in drag reduction: synthesis, characterization, and dilute solution behavior. (Water Soluble Copolymers, ... from: Polymer Engineering and Science | Digitalby Pavneet S. Mumick (Author), Charles L. McCormick (Author)
| List Price: | $5.95 | | | Available: | Available for download now |
| | Binding: | Digital | | Publisher: | Society of Plastics Engineers, Inc. | | Page Count: | 20 Pages | | Publication Date: | September 01, 1994 |
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This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on September 1, 1994. The length of the article is 5887 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.From the author: Copolymers of N-isopropylacrylamide (IPAM) and acrylamide (AM) have been synthesized by free radical polymerization in deionized water using potassium persulfate as the initiator. Copolymer compositions were obtained by elemental analysis and [sup.13]C NMR. An [r.sub.1] [r.sub.2] value of 0.99 indicates ideal copolymerization with random incorporation of the comonomers in the copolymers. Weight average molecular weights, second virial coefficients, diffusion coefficients, and average diameters were obtained via classical and quasielastic low angle laser light scattering. The molecular weights for all the copolymers and the homopolymers of IPAM and AM ranged from 2.2 x [10.sup.6] to 5.2 x [10.sup.6] g/mol. The second virial coefficients in deionized water increased with increasing acrylamide content in the copolymers. The dilute solution properties of the copolymers were studied by turbidimetry, microcalorimetry and viscometry. All the copolymers, with the exception of IPAM-40 (the copolymer synthesized with 40 mole% IPAM in the feed), showed lower critical solution temperatures below 100[degrees]C. The solution studies were performed in deionized water, 0.514 M NaCl, and 1 M urea. The properties of the IPAM copolymers were influenced by both hydrophobic associations and hydrogen bonding. In 0.2% (~ 7mM) sodium dodecyl sulfate, the alkyl chain of the surfactant molecules associates with the IPAM moieties on the copolymer backbone, leading to high intrinsic viscosities and the elevation of the LCST above 100[degrees]C.Citation DetailsTitle: N-isopropylacrylamide-co-acrylamide copolymers in drag reduction: synthesis, characterization, and dilute solution behavior. (Water Soluble Copolymers, part 54)Author: Pavneet S. MumickPublication: Polymer Engineering and Science (Refereed)Date: September 1, 1994Publisher: Society of Plastics Engineers, Inc.Volume: v34 Issue: n18 Page: p1419(10)Distributed by Thomson Gale |
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