Correction for 'Nonlinear rheology of entangled polymers at turning point' by Shi-Qing Wang et al., Soft Matter, 2015, DOI: 10.1039/c4sm02664k.
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Bottom-up Multiscale Simulation of Nonlinear Rheology for Entangled Polymer Melts: Using Atactic Polystyrene as An Example.
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December 2024
Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, United States.
Article Synopsis
- A multiscale modeling framework is developed to predict the nonlinear shear rheology of entangled polymer melts, starting from an all-atom model and transitioning to coarser models through a detailed parametrization process.
- The study focuses on atactic polystyrene melts, where the steady shear viscosity is accurately calculated across various shear rates, matching experimental data without needing adjustable parameters.
- The analysis reveals a transition from power-law behavior at high shear rates to a plateau regime at lower rates, influenced by molecular weight, allowing for comprehensive viscosity predictions over a wide range of conditions.
Interactions Between Cationic Micellar Solution and Aromatic Hydrotropes with Subtle Structural Variations.
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School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
Wormlike micelles (WLMs) with tunable viscoelastic characteristics have emerged as indispensable smart materials with a wide range of applications, which have garnered intense interest over the past few decades. However, quantitatively predicting the effect of various hydrotropes on the rheological behaviors of WLMs remains a challenge. In this article, micelles were formed in a mixture of 3-hexadecyloxy-2-hydroxypropyltrimethylammonium bromide (RHTAB) and aromatic hydrotropes (e.
View Article and Find Full Text PDFEffect of the Ratio of Protein to Water on the Weak Gel Nonlinear Viscoelastic Behavior of Fish Myofibrillar Protein Paste from Alaska Pollock.
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Department of Food Science and Biotechnology, College of Agriculture and Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea.
The linear and nonlinear rheological behaviors of fish myofibrillar protein (FMP) paste with 75%, 82%, and 90% moisture content were evaluated using small-amplitude oscillatory shear (SAOS) and large-amplitude oscillatory shear (LAOS) tests. SAOS revealed pastes with 75% and 82% moisture exhibited solid-like behavior, characterized by higher storage modulus (G') than loss modulus (G″), indicative of weak gel properties with a strong protein interaction. In contrast, the 90% moisture content showed more viscous behavior due to weakened protein-protein entanglements.
View Article and Find Full Text PDFMicrostructure of starch complexes coated with arabinoxylans and β-glucans: Effect on gelatinization and digestion properties.
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January 2025
College of Food Science and Technology, Southwest Minzu University, Chengdu 610041, China. Electronic address:
Research has shown that the presence of a complete cell wall structure in the grain endosperm reduces the digestibility of grains (starch) in the human body. In this study, composite structures of diverse contents of arabinoxylan (AX) and β-glucan (BG) in combination with wheat starch were constructed to simulate the grid structure formed by the combination of starch granules wrapped within cell walls in the starch endosperm. The gel properties following gelatinization and aging of the complexes were analyzed using rheology, differential scanning calorimetry, X-ray scanning, and infrared spectroscopy.
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August 2024
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russia.
The progress in polymer science and nanotechnology yields new colloidal and macromolecular objects and their combinations, which can be defined as complex polymer materials. The complexity may include a complicated composition and architecture of macromolecular chains, specific intermolecular interactions, an unusual phase behavior, and a structure of a multi-component polymer-containing material. Determination of a relation between the structure of a complex material, the structure and properties of its constituent elements, and the rheological properties of the material as a whole is the subject of structural rheology-a valuable tool for the development and study of novel materials.
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