scholarly journals Speciation in CO2-loaded aqueous solutions of sixteen triacetoneamine-derivates (EvAs) and elucidation of structure-property relationships

2021 ◽  
Author(s):  
Elmar Kessler ◽  
Luciana Ninni ◽  
Tanja Breug-Nissen ◽  
Benjamin Willy ◽  
Rolf Schneider ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Spectroscopic Study ◽  
Mass Fraction ◽  
Chemical Structure ◽  
Ring Structure ◽  
Important Influence ◽  
Co2 Absorption ◽  
Structure Property ◽  
Structure Property Relationships

The speciation in CO2-loaded aqueous solutions of 16 different derivates of triacetoneamine (EvAs) was investigated in a comprehensive NMR-spectroscopic study. About 350 experiments were carried out for CO2-loadings up to 3 moles CO2 per mole amine, temperatures between 20 °C and 100 °C, and a mass fraction of EvA in the unloaded solvent of 0.1 g/g. The observed CO2-containing species were primary and secondary carbamates, alkylcarbonate, (bi)carbonate, and molecular CO2. Some EvAs can form zwitterions with a ring structure, which have an important influence on the speciation. From the comprehensive set of data, relationships between the chemical structure of the EvAs and the observed speciation in aqueous solution were established. These results were related to application properties of the EvAs that were taken from previous work. Based on the findings, some general guidelines for the design of new amines were derived and applied for proposing new amines for CO2-absorption.

scholarly journals Defining side chain successions in anthracene-based poly(arylene ethynylene)-alt-poly(phenylene vinylene)s: probing structure–property relationships

2019 ◽  
Vol 10 (39) ◽  
pp. 5339-5347
Author(s):  
Christoph Ulbricht ◽  
Nassima Bouguerra ◽  
Samuel Inack Ngi ◽  
Oliver Brüggemann ◽  
Daniel A. M. Egbe
Keyword(s):  
Conjugated Polymers ◽  
Spectroscopic Study ◽  
Side Chain ◽  
Phenylene Vinylene ◽  
Structure Property ◽  
Structure Property Relationships

A detailed spectroscopic study of nine conjugated polymers with various octyloxy/2-ethylhexyloxy side chain sequences prepared using optimized regio-selective synthetic pathways.

Elastomeric Polyether-Ester Block Copolymers. I. Structure-Property Relationships of Tetramethylene Terephthalate/Polyether Terephthalate Copolymers

1977 ◽  
Vol 50 (4) ◽  
pp. 688-703 ◽  
Author(s):  
J. R. Wolfe
Keyword(s):  
Phase Separation ◽  
Melting Point ◽  
Block Copolymers ◽  
Low Temperature ◽  
Chain Length ◽  
Chemical Structure ◽  
High Water ◽  
Structure Property ◽  
Tear Strength ◽  
Structure Property Relationships

Abstract The properties of elastomeric tetramethylene terephthalate/polyether terephthalate copolymers have been related to the chemical structure, chain length, and concentration in the copolymers of the PTMEG-, PEG-, and PPG-derived polyether units. Low-temperature properties and tear strength are dependent on all three polyether-related variables. Melting point, hardness, and stress at 100% elongation appear to be independent of polyether structure. Polyether glycols of low MW volatilize during copolymer preparation. High-MW polyethers tend to crystallize when present in the copolymers. Polyether glycols of intermediate MW (∼ 1000) yield copolymers with the best resistance to low-temperature stiffening. Copolymer synthesis is most difficult with PPG as the polyether glycol. Inherent viscosities are low, and phase separation occurs at lower polyether MW than with PTMEG or PEG. The PEG-based copolymers exhibit high water swell, particularly at intermediate and high PEG MW. The PTMEG-based copolymers are easiest to synthesize and exhibit the best overall combination of properties.

Experiments on the Kinetics and Activation Mechanism of CO2 Loaded MEA-MDEA Aqueous Solutions

2012 ◽  
Vol 610-613 ◽  
pp. 1213-1217 ◽  
Author(s):  
Dong Fu ◽  
Lin Wei ◽  
Xiang Fei
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Mass Fraction ◽  
Absorption Rate ◽  
Normal Pressure ◽  
Activation Mechanism

The solubility and absorption rate of CO2 in monoethanolamine (MEA) promoted N-methyldiethanolamine (MDEA) aqueous solution were measured at normal pressure with temperatures ranging from 303.15-323.15K. The temperature and the mass fraction dependences of the solubility of CO2 and CO2 loading were determined. The influence of the mass fraction of MEA on the absorption rate of CO2 was illustrated.

Experiments on the Kinetics and Solubility of CO2 in AMP-PZ Aqueous Solutions

2013 ◽  
Vol 411-414 ◽  
pp. 2989-2992
Author(s):  
Dong Fu ◽  
Hong Mei Wang ◽  
Lei Xia Du
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Mass Fraction ◽  
Absorption Rate ◽  
Normal Pressure

The solubility and saturated loading of CO2in piperazine (PZ) promoted 2-amino-2-methyl-1-propanol (AMP) aqueous solution were measured at normal pressure with temperatures ranging from 293.15K to 323.15K. The temperature and the mass fraction dependences of the solubility and saturated loading of CO2were determined. The influence of the mass fraction of PZ on the absorption rate of CO2was illustrated.

A spectroscopic study of solvent effects on the formation of Cu(II)-chloride complexes in aqueous solution

2021 ◽  
Author(s):  
ning zhang ◽  
Jianfeng Tang ◽  
Yuntian Ma ◽  
Minghui Liang ◽  
Dewen Zeng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Spectroscopic Study ◽  
Solvent Effects ◽  
Chloride Complexes ◽  
Concentrated Aqueous Solutions ◽  
X Ray ◽  
X Ray Absorption

A combination of electronic (UV-Vis) and X-ray absorption (EXAFS, XANES) spectroscopies has been used to investigate the formation of copper(II)/chloride complexes in concentrated aqueous solutions. It is established that lowering...

Structure-property relationships in epoxy hybrid networks based on high mass fraction pendant POSS incorporated at molecular level

Polymer ◽  
2018 ◽  
Vol 139 ◽  
pp. 201-212 ◽  
Author(s):  
Amit K. Sharma ◽  
Reese Sloan ◽  
Ramesh Ramakrishnan ◽  
Sergei I. Nazarenko ◽  
Jeffrey S. Wiggins
Keyword(s):  
Mass Fraction ◽  
Molecular Level ◽  
Hybrid Networks ◽  
High Mass ◽  
Structure Property ◽  
Structure Property Relationships

Acceptor–donor–acceptor type molecules for high performance organic photovoltaics – chemistry and mechanism

2020 ◽  
Vol 49 (9) ◽  
pp. 2828-2842 ◽  
Author(s):  
Xiangjian Wan ◽  
Chenxi Li ◽  
Mingtao Zhang ◽  
Yongsheng Chen
Keyword(s):  
Organic Photovoltaics ◽  
High Performance ◽  
Chemical Structure ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Donor Acceptor

The chemical structure–property relationships and mechanism for high performance organic photovoltaics of acceptor–donor–acceptor type molecules are discussed.

scholarly journals Relationships between chemical structure, mechanical properties and materials processing in nanopatterned organosilicate fins

2017 ◽  
Vol 8 ◽  
pp. 863-871 ◽  
Author(s):  
Gheorghe Stan ◽  
Richard S Gates ◽  
Qichi Hu ◽  
Kevin Kjoller ◽  
Craig Prater ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Electrical Characterization ◽  
Inverse Correlation ◽  
Structure Characterization ◽  
Structure Property ◽  
Chemical Structures ◽  
Structure Property Relationships ◽  
Nanoscale Characterization ◽  
20 Nm

The exploitation of nanoscale size effects to create new nanostructured materials necessitates the development of an understanding of relationships between molecular structure, physical properties and material processing at the nanoscale. Numerous metrologies capable of thermal, mechanical, and electrical characterization at the nanoscale have been demonstrated over the past two decades. However, the ability to perform nanoscale molecular/chemical structure characterization has only been recently demonstrated with the advent of atomic-force-microscopy-based infrared spectroscopy (AFM-IR) and related techniques. Therefore, we have combined measurements of chemical structures with AFM-IR and of mechanical properties with contact resonance AFM (CR-AFM) to investigate the fabrication of 20–500 nm wide fin structures in a nanoporous organosilicate material. We show that by combining these two techniques, one can clearly observe variations of chemical structure and mechanical properties that correlate with the fabrication process and the feature size of the organosilicate fins. Specifically, we have observed an inverse correlation between the concentration of terminal organic groups and the stiffness of nanopatterned organosilicate fins. The selective removal of the organic component during etching results in a stiffness increase and reinsertion via chemical silylation results in a stiffness decrease. Examination of this effect as a function of fin width indicates that the loss of terminal organic groups and stiffness increase occur primarily at the exposed surfaces of the fins over a length scale of 10–20 nm. While the observed structure–property relationships are specific to organosilicates, we believe the combined demonstration of AFM-IR with CR-AFM should pave the way for a similar nanoscale characterization of other materials where the understanding of such relationships is essential.

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