Mesoscale Simulations of Quaternary Ammonium-Tethered Triblock Copolymers: Effects of the Degree of Functionalization and Styrene Content

2020 ◽  
Vol 124 (30) ◽  
pp. 16315-16323
Author(s):  
Xubo Luo ◽  
Hongjun Liu ◽  
Chulsung Bae ◽  
Mark E. Tuckerman ◽  
Michael A. Hickner ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Triblock Copolymers ◽  
Styrene Content ◽  
Mesoscale Simulations

Mesoscale Simulations of Anion Exchange Membranes Based on Quaternary Ammonium Tethered Triblock Copolymers

2017 ◽  
Vol 50 (11) ◽  
pp. 4397-4405 ◽  
Author(s):  
Fatemeh Sepehr ◽  
Hongjun Liu ◽  
Xubo Luo ◽  
Chulsung Bae ◽  
Mark E. Tuckerman ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Quaternary Ammonium ◽  
Triblock Copolymers ◽  
Anion Exchange Membranes ◽  
Mesoscale Simulations

scholarly journals Investigating Silver Nanoparticle Interactions with Quaternary Ammonium Functionalized Triblock Copolymers and Their Effect on Midblock Crystallinity

2020 ◽  
Vol 2 (11) ◽  
pp. 4914-4923
Author(s):  
Nora C. Buggy ◽  
Yifeng Du ◽  
Mei-Chen Kuo ◽  
Ryan J. Gasvoda ◽  
Soenke Seifert ◽  
...  
Keyword(s):  
Silver Nanoparticle ◽  
Quaternary Ammonium ◽  
Triblock Copolymers ◽  
Nanoparticle Interactions

Triblock copolymers functionalized with quaternary ammonium salts as dehydrating agents for heavy and extra-heavy crude oils

2018 ◽  
Vol 39 (10) ◽  
pp. 1502-1509 ◽  
Author(s):  
Edgar B. Zamora ◽  
Flavio Vázquez ◽  
Edgar I. Hernández ◽  
Fernando Álvarez ◽  
Gerardo Zavala ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Triblock Copolymers ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Crude Oils ◽  
Heavy Crude

Catalyst- and oxidant-free electrochemical para-selective hydroxylation of N-arylamides in batch and continuous-flow

2020 ◽  
Vol 22 (19) ◽  
pp. 6437-6443
Author(s):  
Cheng-Kou Liu ◽  
Meng-Yi Chen ◽  
Xin-Xin Lin ◽  
Zheng Fang ◽  
Kai Guo
Keyword(s):  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Continuous Flow ◽  
Quaternary Ammonium Salt ◽  
Selective Hydroxylation

A catalyst-, oxidant-, acidic solvent- and quaternary ammonium salt-free electrochemical para-selective hydroxylation of N-arylamides at rt in batch and continuous-flow was developed.

Self-Assembly of Hydrogels From Elastin-Mimetic Block Copolymers

2002 ◽  
Vol 724 ◽  
Author(s):  
Elizabeth R. Wright ◽  
R. Andrew McMillan ◽  
Alan Cooper ◽  
Robert P. Apkarian ◽  
Vincent P. Conticello
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Variable Temperature ◽  
Inverse Temperature ◽  
Temperature Transition ◽  
Scanning Calorimetry ◽  
Design Synthesis ◽  
Inverse Temperature Transition ◽  
Functional Biomaterials

AbstractTriblock copolymers have traditionally been synthesized with conventional organic components. However, triblock copolymers could be synthesized by the incorporation of two incompatible protein-based polymers. The polypeptides would differ in their hydrophobicity and confer unique physiochemical properties to the resultant materials. One protein-based polymer, based on a sequence of native elastin, that has been utilized in the synthesis of biomaterials is poly (Valine-Proline-Glycine-ValineGlycine) or poly(VPGVG) [1]. This polypeptide has been shown to have an inverse temperature transition that can be adjusted by non-conservative amino acid substitutions in the fourth position [2]. By combining polypeptide blocks with different inverse temperature transition values due to hydrophobicity differences, we expect to produce amphiphilic polypeptides capable of self-assembly into hydrogels. Our research examines the design, synthesis and characterization of elastin-mimetic block copolymers as functional biomaterials. The methods that are used for the characterization include variable temperature 1D and 2D High-Resolution-NMR, cryo-High Resolutions Scanning Electron Microscopy and Differential Scanning Calorimetry.

Multiscale Simulations of Triblock Copolymers

2007 ◽  
Vol 5 (3-4) ◽  
pp. 167-179 ◽  
Author(s):  
Jan Andzelm ◽  
Frederick L. Beyer ◽  
James Snyder ◽  
Peter W. Chung
Keyword(s):  
Triblock Copolymers ◽  
Multiscale Simulations

Determination of quaternary ammonium compounds in food products by the method of ultra-performance liquid chromatography/high resolution mass-spectrometry

2020 ◽  
Vol 86 (8) ◽  
pp. 23-31
Author(s):  
V. G. Amelin ◽  
D. S. Bolshakov
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Quaternary Ammonium ◽  
High Resolution Mass Spectrometry ◽  
Food Products ◽  
Quaternary Ammonium Compounds ◽  
High Resolution Mass ◽  
Ammonium Compounds ◽  
Resolution Mass

The goal of the study is developing a methodology for determination of the residual amounts of quaternary ammonium compounds (QAC) in food products by UHPLC/high-resolution mass spectrometry after water-acetonitrile extraction of the determined components from the analyzed samples. The identification and determination of QAC was carried out on an «UltiMate 3000» ultra-high-performance liquid chromatograph (Thermo Scientific, USA) equipped with a «maXis 4G» high-resolution quadrupole-time-of-flight mass spectrometric detector and an ion spray «ionBooster» source (Bruker Daltonics, Germany). Samples of milk, cheese (upper cortical layer), dumplings, pork, chicken skin and ground beef were used as working samples. Optimal conditions are specified for chromatographic separation of the mixture of five QAC, two of them being a mixture of homologues with a linear structure (including isomeric forms). The identification of QAC is carried out by the retention time, exact mass of the ions, and coincidence of the mSigma isotopic distribution. The limits for QAC detection are 0.1 – 0.5 ng/ml, the determination limits are 1 ng/ml for aqueous standard solutions. The determinable content of QAC in food products ranges within 1 – 100 ng/g. The results of analysis revealed the residual amount of QAC present in all samples, which confirms data of numerous sources of information about active use of QAC-based disinfectants in the meat and dairy industry. The correctness of the obtained results is verified by introduction of the additives in food products at a level of 10 ng/g for each QAC. The relative standard deviation of the analysis results does not exceed 0.18. The duration of the analysis is 30 – 40 min.

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