scholarly journals Development of highly gas-permeable polymers by metathesis copolymerization of 1-(p-trimethylsilyl)phenyl-1-propyne with tert-butyl and silyl group-containing diphenylacetylenes

RSC Advances ◽  
2021 ◽  
Vol 11 (51) ◽  
pp. 32419-32424
Author(s):  
Yi Lin ◽  
Jianrong Dong ◽  
Toshikazu Sakaguchi ◽  
Tamotsu Hashimoto
Keyword(s):  
Gas Permeability ◽  
Polymer Membranes ◽  
Silyl Group ◽  
Tert Butyl

Metathesis copolymerization of 1-(p-trimethylsilyl)phenyl-1-propyne with diphenylacetylenes was achieved and the gas permeability of polymer membranes was improved by the incorporation of 20% phenylpropyne unit.

scholarly journals Enhancement of oxygen permeability by copolymerization of silyl group-containing diphenylacetylenes with tert-butyl group-containing diphenylacetylene and desilylation of copolymer membranes

RSC Advances ◽  
2017 ◽  
Vol 7 (49) ◽  
pp. 30949-30955 ◽  
Author(s):  
T. Sakaguchi ◽  
Y. Lin ◽  
T. Hashimoto
Keyword(s):  
Oxygen Permeability ◽  
Gas Permeability ◽  
Silyl Group ◽  
Composition Ratio ◽  
Tert Butyl ◽  
Butyl Group ◽  
Tert Butyl Group

The gas permeability of poly(TMSDPA-co-TBDPA) was higher than those of homopolymers, poly(TMSDPA) and poly(TBDPA). The gas permeability of copolymers and desilylated copolymers increased with increasing of the composition ratio of TBDPA.

scholarly journals Imputation of Missing Gas Permeability Data for Polymer Membranes using Machine Learning

2020 ◽  
Author(s):  
Qi Yuan ◽  
Mariagiulia Longo ◽  
Aaron Thornton ◽  
Neil B. McKeown ◽  
Bibiana Comesana-Gandara ◽  
...  
Keyword(s):  
Machine Learning ◽  
Energy Efficient ◽  
Missing Values ◽  
Gas Permeability ◽  
Polymer Membranes ◽  
Gas Separations ◽  
Initial Stage ◽  
Sparse Features ◽  
Potential Use ◽  
Insight Into

<p><a>Polymer-based membranes can be used for energy efficient gas separations. Successful exploitation of new materials requires accurate knowledge of the transport properties of all gases of interest. An open source database of such data is of significant benefit to the research community. The Membrane Society of Australasia (https://membrane-australasia.org/) hosts a database for experimentally measured and reported polymer gas permeabilities. However, the database is incomplete, limiting its potential use as a research tool. Here, missing values in the database were filled using machine learning (ML). The ML model was validated against gas permeability measurements that were not recorded in the database. Through imputing the missing data, it is possible to re-analyse historical polymers and look for potential “missed” candidates with promising gas selectivity. In addition, for systems with limited experimental data, ML using sparse features was performed, and we suggest that once the permeability of CO<sub>2</sub> and/or O<sub>2</sub> for a polymer has been measured, most other gas permeabilities and selectivities, including those for CO<sub>2</sub>/CH<sub>4</sub> and CO<sub>2</sub>/N<sub>2</sub>, can be quantitatively estimated. This early insight into the gas permeability of a new system can be used at an initial stage of experimental measurements to rapidly identify polymer membranes worth further investigation.</a></p>

scholarly journals Polymer membranes with high gas permeability.

Kobunshi ◽  
1988 ◽  
Vol 37 (11) ◽  
pp. 832-835
Author(s):  
Tsutomu Nakagawa
Keyword(s):  
Gas Permeability ◽  
Polymer Membranes

Characterization of gas permeability of polymer membranes for encapsulation of 2D-material sensors

2021 ◽  
Author(s):  
Martin Schubert ◽  
Zahra Fekri ◽  
Thomas Ackstaller ◽  
Yagnika Vekariya ◽  
Krzysztof Nieweglowski ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Polymer Membranes ◽  
2D Material

An Electron Spin Resonance Study of the Arylsilyl Adducts of Phenyl tert-Butyl Nitrone and Their Decomposition Kinetics

1974 ◽  
Vol 52 (16) ◽  
pp. 2901-2905 ◽  
Author(s):  
Babatunde B. Adeleke ◽  
Sau-King Wong ◽  
Jeffrey K. S. Wan
Keyword(s):  
Decomposition Kinetics ◽  
Electron Spin Resonance Study ◽  
Silyl Group ◽  
First Order ◽  
Tert Butyl ◽  
First Order Kinetics ◽  
Spin Resonance ◽  
Butyl Peroxide ◽  
The Stability ◽  
Spin Resonance Study

The formation and the stability of some arylsilyl adducts of phenyl tert-butyl nitrone were studied in a photochemical system using di-tert-butyl peroxide as solvent. The β-proton splittings of all the arylsilyl adducts, ranging from 5.6 to 8.3 G, are relatively larger than their carbon analogs, which are usually less than 4 G. The arylsilyl adducts are found to decompose in di-tert-butyl peroxide solvent by a first-order kinetics. The activation energy involved in the decomposition of a series of arylsilyl adducts varies from about 14 to about 9 kcal/mol, as the size of the silyl group increases. In all cases, very low values of the A factors (between 106 and 1010) were observed.

scholarly journals New Poly(imide)s Bearing Alkyl Side-Chains: A Study on the Impact of Size and Shape of Lateral Groups on Thermal, Mechanical, and Gas Transport Properties

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 141
Author(s):  
Fidel E. Rodríguez-González ◽  
Germán Pérez ◽  
Vladimir Niebla ◽  
Ignacio Jessop ◽  
Rudy Martin-Trasanco ◽  
...  
Keyword(s):  
Transport Properties ◽  
Gas Transport ◽  
Gas Permeability ◽  
Tensile Modulus ◽  
Side Group ◽  
Tert Butyl ◽  
Degradation Temperature ◽  
Gas Transport Properties ◽  
The Impact ◽  
Poly Imide

A set of five new aromatic poly(imide)s (PIs) incorporating pendant acyclic alkyl moieties were synthesized. The difference among them was the length and bulkiness of the pendant group, which comprises of linear alkyl chains from three to six carbon atoms, and a tert-butyl moiety. The effect of the side group length on the physical, thermal, mechanical, and gas transport properties was analyzed. All PIs exhibited low to moderate molecular weights (Mn ranged between 27.930–58.970 Da, and Mw ranged between 41.760–81.310 Da), good solubility in aprotic polar solvents, except for PI-t-4, which had a tert-butyl moiety and was soluble even in chloroform. This behaviour was probably due to the most significant bulkiness of the side group that increased the interchain distance, which was corroborated by the X-ray technique (PI-t-4 showed two d-spacing values: 5.1 and 14.3 Å). Pure gas permeabilities for several gases were reported (PI-3 (Barrer): He(52); H2(46); O2(5.4); N2(1.2); CH4(1.1); CO2(23); PI-t-4 (Barrer): He(139); H2(136); O2(16.7); N2(3.3); CH4(2.3); CO2(75); PI-5 (Barrer): He(44); H2(42); O2(5.9); N2(1.4); CH4(1.2); CO2(27); PI-6 (Barrer): He(45); H2(43); O2(6.7); N2(1.7); CH4(1.7); CO2(32)). Consistent higher volume in the side group was shown to yield the highest gas permeability. All poly(imide)s exhibited high thermal stability with 10% weight loss degradation temperature between 448–468 °C and glass transition temperature between 240–270 °C. The values associated to the tensile strength (45–87 MPa), elongation at break (3.2–11.98%), and tensile modulus (1.43–2.19 GPa) were those expected for aromatic poly(imide)s.

The tert-butyl dimethyl silyl group as an enhancer of drug cytotoxicity against human tumor cells

2005 ◽  
Vol 15 (15) ◽  
pp. 3536-3539 ◽  
Author(s):  
Osvaldo J. Donadel ◽  
Tomás Martín ◽  
Víctor S. Martín ◽  
Jesús Villar ◽  
José M. Padrón
Keyword(s):  
Tumor Cells ◽  
Human Tumor ◽  
Human Tumor Cells ◽  
Silyl Group ◽  
Tert Butyl
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