Relevant bibliographies by topics / Association of polymers

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Academic literature on the topic 'Association of polymers'

Author: Grafiati
Published: 28 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Association of polymers"

1

Shi, Lei Ting, Zhe Na Shen, Wei Zhou, Zhong Bin Ye, and Jun Feng Wang. "Study on the Performance of Hydrophobic Association Water-Soluble Polymer with Strong Association Ability." Advanced Materials Research 418-420 (December 2011): 232–36. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.232.

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In this article, the viscosifying abilities, rheological properties, and flow characteristics of hydrophobic association water-soluble polymer with high association ability were studied using technical methods of viscosity measurement, rheological and core flow experiments. The results illustrate that hydrophobic associated polymers with low molecular weight rely on a strong hydrophobic interaction, the intermolecular and intramolecular micellar structure formed in solution with a strong ability to increase viscosity. Hydrophobic association water-soluble polymer, comparing with partially hydrolyzed polyacrylamides polymer with low molecular weight, presents a better ability of shear stability under the condition of shearing and the solution structure strengthens gradually so as to increase viscoelasticity remarkably. The hydrophobic association water-soluble polymer with high association ability take on greater injectivity and mobility control ability in low permeability porous media solving the problem of low injectivity and poor control ability in mid-low permeability reservoirs, which improves polymers flooding effect in such reservoirs and underlie the reasonable design of polymer molecular structure.
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2

Shapiro, Karen, Colin Krusor, Fernanda F. M. Mazzillo, et al. "Aquatic polymers can drive pathogen transmission in coastal ecosystems." Proceedings of the Royal Society B: Biological Sciences 281, no. 1795 (2014): 20141287. http://dx.doi.org/10.1098/rspb.2014.1287.

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Gelatinous polymers including extracellular polymeric substances (EPSs) are fundamental to biophysical processes in aquatic habitats, including mediating aggregation processes and functioning as the matrix of biofilms. Yet insight into the impact of these sticky molecules on the environmental transmission of pathogens in the ocean is limited. We used the zoonotic parasite Toxoplasma gondii as a model to evaluate polymer-mediated mechanisms that promote transmission of terrestrially derived pathogens to marine fauna and humans. We show that transparent exopolymer particles, a particulate form of EPS, enhance T. gondii association with marine aggregates, material consumed by organisms otherwise unable to access micrometre-sized particles. Adhesion to EPS biofilms on macroalgae also captures T. gondii from the water, enabling uptake of pathogens by invertebrates that feed on kelp surfaces. We demonstrate the acquisition, concentration and retention of T. gondii by kelp-grazing snails, which can transmit T. gondii to threatened California sea otters. Results highlight novel mechanisms whereby aquatic polymers facilitate incorporation of pathogens into food webs via association with particle aggregates and biofilms. Identifying the critical role of invisible polymers in transmission of pathogens in the ocean represents a fundamental advance in understanding and mitigating the health impacts of coastal habitat pollution with contaminated runoff.
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3

Wei, Ming-Hsin, Boyu Li, R. L. Ameri David, et al. "Megasupramolecules for safer, cleaner fuel by end association of long telechelic polymers." Science 350, no. 6256 (2015): 72–75. http://dx.doi.org/10.1126/science.aab0642.

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We used statistical mechanics to design polymers that defy conventional wisdom by self-assembling into “megasupramolecules” (≥5000 kg/mol) at low concentration (≤0.3 weight percent). Theoretical treatment of the distribution of individual subunits—end-functional polymers—among cyclic and linear supramolecules (ring-chain equilibrium) predicts that megasupramolecules can form at low total polymer concentration if, and only if, the backbones are long (>400 kg/mol) and end-association strength is optimal. Viscometry and scattering measurements of long telechelic polymers having polycyclooctadiene backbones and acid or amine end groups verify the formation of megasupramolecules. They control misting and reduce drag in the same manner as ultralong covalent polymers. With individual building blocks short enough to avoid hydrodynamic chain scission (weight-average molecular weights of 400 to 1000 kg/mol) and reversible linkages that protect covalent bonds, these megasupramolecules overcome the obstacles of shear degradation and engine incompatibility.
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4

Schertzer, Jeffrey W., and Eric D. Brown. "Use of CDP-Glycerol as an Alternate Acceptor for the Teichoic Acid Polymerase Reveals that Membrane Association Regulates Polymer Length." Journal of Bacteriology 190, no. 21 (2008): 6940–47. http://dx.doi.org/10.1128/jb.00851-08.

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ABSTRACT The study of bacterial extracellular polysaccharide biosynthesis is hampered by the fact that these molecules are synthesized on membrane-resident carrier lipids. To get around this problem, a practical solution has been to synthesize soluble lipid analogs and study the biosynthetic enzymes using a soluble system. This has been done for the Bacillus subtilis teichoic acid polymerase, TagF, although several aspects of catalysis were inconsistent with the results obtained with reconstituted membrane systems or physiological observations. In this work we explored the acceptor substrate promiscuity and polymer length disregulation that appear to be characteristic of TagF activity away from biological membranes. Using isotope labeling, steady-state kinetics, and chemical lability studies, we demonstrated that the enzyme can synthesize poly(glycerol phosphate) teichoic acid using the elongation substrate CDP-glycerol as an acceptor. This suggests that substrate specificity is relaxed in the region distal to the glycerol phosphate moiety in the acceptor molecule under these conditions. Polymer synthesis proceeded at a rate (27 min−1) comparable to that in the reconstituted membrane system after a distinct lag period which likely represented slower initiation on the unnatural CDP-glycerol acceptor. We confirmed that polymer length became disregulated in the soluble system as the polymers synthesized on CDP-glycerol acceptors were much larger than the polymers synthesized on the membrane or previously found attached to bacterial cell walls. Finally, polymer synthesis on protease-treated membranes suggested that proper length regulation is retained in the absence of accessory proteins and provided evidence that such regulation is conferred through proper association of the polymerase with the membrane.
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5

Okawa, Kaori, Jian Ping Gong, and Yoshihito Osada. "Self-Propagating Association of Zwitterionic Polymers Initiated by Ionene Polymers." Macromolecular Rapid Communications 23, no. 7 (2002): 423. http://dx.doi.org/10.1002/1521-3927(20020401)23:7<423::aid-marc423>3.0.co;2-f.

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6

Srebnik, Simcha. "Physical association of polymers with nanotubes." Journal of Polymer Science Part B: Polymer Physics 46, no. 24 (2008): 2711–18. http://dx.doi.org/10.1002/polb.21605.

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7

Zhang, Zhijie, Chongwen Huang, R. A. Weiss, and Quan Chen. "Association energy in strongly associative polymers." Journal of Rheology 61, no. 6 (2017): 1199–207. http://dx.doi.org/10.1122/1.4997586.

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8

Quan, Xie, Su, and Feng. "The Thermoviscosifying Behavior of Water-Soluble Polymer Based on Graft Polymerization of Pluronic F127 with Acrylamide and 2-Acrylamido-2-methylpropane Sulfonic Acid Sodium Salt." Polymers 11, no. 10 (2019): 1702. http://dx.doi.org/10.3390/polym11101702.

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A new concept of thermoviscosifying polymers is proposed to address the problems about decreasing viscosity of polymer solution under high temperatures. However, existing thermoviscosifying polymers have complicated synthesis processes and high costs, and both of them restrict the wide practical applications of thermoviscosifying polymers. Although polyethers have the characteristics of thermal gelatinization, they just display thermoviscosifying behaviors only under extremely high concentrations (&gt;15 wt %). Therefore, the graft copolymerization of the commercialized Pluronic F127 (PEO100-PPO65-PEO100) with acrylamide and 2-acrylamide-methylpropionic acid sodium salt was studied here. A series of graft modified polyether polymers were prepared and it was expected to get thermoviscosifying polymers with high molecular weights and low association temperatures. Several factors on thermoviscosifying behaviors were investigated, such as polymerization condition, polymer concentration, hydrophilic monomer, molecular structure and molecular weight. It was also proven that the apparent viscosity of polymer solution is influenced by polymer concentration, molecular weight of polymer, and content of anion groups.
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9

Donato, Ricardo K., and Alice Mija. "Keratin Associations with Synthetic, Biosynthetic and Natural Polymers: An Extensive Review." Polymers 12, no. 1 (2019): 32. http://dx.doi.org/10.3390/polym12010032.

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Among the biopolymers from animal sources, keratin is one the most abundant, with a major contribution from side stream products from cattle, ovine and poultry industry, offering many opportunities to produce cost-effective and sustainable advanced materials. Although many reviews have discussed the application of keratin in polymer-based biomaterials, little attention has been paid to its potential in association with other polymer matrices. Thus, herein, we present an extensive literature review summarizing keratin’s compatibility with other synthetic, biosynthetic and natural polymers, and its effect on the materials’ final properties in a myriad of applications. First, we revise the historical context of keratin use, describe its structure, chemical toolset and methods of extraction, overview and differentiate keratins obtained from different sources, highlight the main areas where keratin associations have been applied, and describe the possibilities offered by its chemical toolset. Finally, we contextualize keratin’s potential for addressing current issues in materials sciences, focusing on the effect of keratin when associated to other polymers’ matrices from biomedical to engineering applications, and beyond.
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10

Peng, Yuankun, Tongkui Yue, Sai Li, et al. "Rheological and structural properties of associated polymer networks studied via non-equilibrium molecular dynamics simulation." Molecular Systems Design & Engineering 6, no. 6 (2021): 461–75. http://dx.doi.org/10.1039/d1me00017a.

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The physical polymer network formed by molecular association via non-covalent interactions between end groups alters a great many rheological properties of polymers and produces some fascinating rheological phenomena.
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