Article
Polymer Science
Alyssa Travitz, Ronald G. Larson
Summary: The study utilizes Brownian dynamics simulations and self-consistent field theory to calculate the transition rates and times of a telechelic polymer, revealing two different scaling regimes for the bridge-to-loop transition time. This has implications for understanding the dynamics of colloidal particles bridged by telechelic rheology-modifying polymers in latex coating fluids.
Article
Nanoscience & Nanotechnology
Daniel P. Keane, Matthew D. Mellor, Ryan Poling-Skutvik
Summary: The rheology of emulsions can be effectively modified by high-molecular-weight telechelic triblock copolymers. These polymers form elastic networks between nanodroplets, leading to increased elasticity of the emulsions. The nanoscale interactions and temperature can also be controlled to adjust the polymer partitioning and the rheological behavior of the emulsions. These findings have important implications for enhancing the processability and transport of complex fluids.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Sriram Krishnamurthy, Gopal Parthasarathy, Ronald G. Larson, Ethayaraja Mani
Summary: We performed coarse-grained Brownian dynamics simulations to study the shearing flow of a colloidal suspension with telechelic polymers as bridges. By varying the sticky end group strength epsilon, we were able to simulate the rheology of latex paints. Our results confirm that the dynamics of the system are influenced by the shear rate and the timescales of sticker release, polymer relaxation, and colloid diffusion. This study provides mesoscale simulations that can be used to improve models and constitutive equations for complex suspensions.
Article
Polymer Science
Vladimir A. Baulin
Summary: This study discusses the micellization and morphology of spherical telechelic micelles formed by triblock copolymers. The transition between closed loop and linear conformations drives the formation of different topological micelles.
Review
Polymer Science
Tianwei Yan, Damien Guironnet
Summary: This paper reviews various strategies for synthesizing telechelic polyolefins from ethylene monomers, highlighting different synthesis methods and their advantages and disadvantages. Recent advances in insertion polymerization and post-polymerization functionalization have led to the development of novel synthetic methods for accessing telechelic polyolefins.
Article
Mechanics
Chandi Sasmal
Summary: This study investigates the flow characteristics of a solid and smooth sphere moving steadily along the axis of a cylindrical tube filled with wormlike micellar solutions. Two different constitutive models are used to analyze the rheological behavior, showing that unsteady motion downstream of the sphere occurs when the Weissenberg number exceeds a critical value in the two-species model. However, the single-species Giesekus model predicts a steady flow field. The onset of unsteady motion is delayed as the ratio of sphere to tube diameter decreases, showing qualitative similarity with prior experimental results.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Polymer Science
Changpeng Gu, Zhukang Du, Xikai Ouyang, Hengxue Xiang, Meifang Zhu, Jintian Luo, GengXin Liu
Summary: In this study, in situ UV irradiation was used to increase the molecular weight of telechelic associating polymers (TAPs) without changing concentrations. The extensional rheology and structure evolution of TAPs were investigated by dripping-onto-substrate rheometer with UV-induced coupling.
Article
Polymer Science
Sina Ghiassinejad, Kell Mortensen, Matin Rostamitabar, Jagadeesh Malineni, Charles-Andre Fustin, Evelyne van Ruymbeke
Summary: This study demonstrates the ability to modulate the structure and properties of a polymer by varying the nature and amount of metal ions added to the system, as well as the sample thermal history. The effects of metal ions on sample properties were confirmed, with the stability of structures depending on the formation of complexes within the sample.
Article
Mechanics
Brato Chakrabarti, Yanan Liu, Olivia du Roure, Anke Lindner, David Saintillan
Summary: Numerical simulations are used to uncover the effects of morphological transitions on the steady shear rheology of a dilute suspension of stiff polymers as they tumble in shear flow. The results are in agreement with classic scalings for Brownian rods in relatively weak flows but differ above the buckling threshold, showing enhanced shear thinning and an increase in normal stress differences. The study highlights the subtle role of thermal fluctuations in triggering instabilities, based on past work on rigid Brownian rods and non-Brownian elastic fibers.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Multidisciplinary
Shengquan Zheng, Yue Liu, Guifu Si, Min Chen
Summary: Introducing covalently crosslinked network to telechelic polymers can enable the formation of advanced polymeric materials with enhanced material properties.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Polymer Science
Xiandeng Qiu, Hua Xue, Lin Xu, Ran Wang, Shengchao Qiu, Qun He, Weifeng Bu
Summary: Telechelic polymers with central polymer chain and two metal complex terminals were successfully synthesized with planar platinum(ii) complexes. These metallopolymers exhibit metal-metal-to-ligand charge-transfer or excimeric phosphorescence emissions, and can self-assemble into flowerlike micelles and vesicle-like structures in specific solvent mixtures. The unconventional self-assembly behaviors are attributed to strong platinum(ii) and/or pi-pi stacking interactions. This study presents a new approach to exploring functional metallopolymer materials.
Article
Polymer Science
Aaron A. Burkey, Danyon M. Fischbach, Charlotte M. Wentz, Kathryn L. Beers, Lawrence R. Sita
Summary: A general synthetic strategy is reported for producing various phenyl-group-terminated polyethenes and poly(alpha-olefins), which can be transformed into different telechelic polyolefins through postpolymerization reactions. These materials serve as building blocks for polyolefin-based synthetic polymers, as demonstrated by the syntheses of well-defined polyolefin-polyester di- and triblock copolymers.
Article
Chemistry, Multidisciplinary
Seigo Watanabe, Hiromichi Nishio, Kenichi Oyaizu
Summary: This paper reports a facile synthesis method for telechelic poly(phenylene sulfide)s through the Friedel-Crafts type electrophilic substitution of the poly(phenylene sulfide) precursors and the halogenated electron-deficient aromatic sulfonium cation.
Article
Polymer Science
Shuang Liu, Zhijie Zhang, Quan Chen, Yumi Matsumiya, Hiroshi Watanabe
Summary: The study found that ionomers based on sodium carboxylate or sodium sulfonate groups form networks sustained by salt aggregates, with M-n-SO3Na showing more stable aggregates compared to M-n-COONa. In nonlinear rheology, M-n-COONa exhibited larger strain during stress overshoot before showing weaker pseudo-yielding and higher fracture strains after overshoot, indicating easier reconstruction of the network. These differences are attributed to a nonuniform distribution of salt aggregate size and superbridge length in M-n-COONa, allowing for more efficient energy dissipation under strong flow conditions.
Article
Polymer Science
Moritz Meier-Merziger, Marcel Fickenscher, Frank Hartmann, Bjoern Kuttich, Tobias Kraus, Markus Gallei, Holger Frey
Summary: Bifunctional initiators were used to synthesize complex triblock copolymer structures in carbanionic polymerization. Isoprene was polymerized using 1,3-bis(1-phenylethenyl)benzene (PEB), resulting in a high content of 93% 1,4-PI units. Hydroxyl groups were then introduced simultaneously in the alpha- and omega-position using end-functionalization of the living anionic di-lithiated polyisoprene (PI) chains with 1,2-isopropylidene glyceryl glycidyl ether (IGG) and subsequent acidic deprotection. The resulting hexa-hydroxy functional PI-macroinitiators were used to initiate l-lactide (LLA) polymerization, leading to the formation of super-H-shaped (PLLA)(3)-b-PI-b-(PLLA)(3) triblock structures with narrow molecular weight distributions.
Article
Chemistry, Physical
J. Castillo-Tejas, O. Castrejon-Gonzalez, S. Carro, V. Gonzalez-Coronel, J. F. J. Alvarado, O. Manero
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2016)
Article
Chemistry, Physical
Manuel Sanchez-Cantu, Clara Barcelos-Santiago, Claudia M. Gomez, Esthela Ramos-Ramirez, Ma. de Lourdes Ruiz Peralta, Nancy Tepale, Valeria J. Gonzalez-Coronel, A. Mantilla, Francisco Tzompantzi
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2016)
Article
Energy & Fuels
Manuel Sanchez-Cantu, Lydia M. Perez-Diaz, Nancy Tepale-Ochoa, Valeria J. Gonzalez-Coronel, Maria E. Ramos-Cassellis, David Machorro-Aguirre, Jaime S. Valente
Article
Polymer Science
Valeria J. Gonzalez-Coronel, Enrique J. Jimenez-Regalado
JOURNAL OF POLYMER RESEARCH
(2013)
Article
Polymer Science
Valeria J. Gonzalez Coronel, Enrique J. Jimenez-Regalado
