The AA* + B*B2 approach A simple and convenient synthetic strategy towards hyperbranched polyurea-urethanes

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Bernd Bruchmann ◽  
Wolfgang Schrepp
Keyword(s):  
Functional Groups ◽  
Raw Materials ◽  
Protecting Groups ◽  
Isophorone Diisocyanate ◽  
Step Process ◽  
Synthetic Strategy ◽  
One Step

Abstract Synthesizing hyperbranched polyurethanes in a one step process using commercially available raw materials: these were the primary conditions for this work. By taking advantage of intramolecular reactivity differences of isocyanate groups in diisocyanates in combination with reactivity differences of OH and NH groups in alkanolamines, it is possible to generate in situ AB2 molecules by controlling reactions of specific functional groups towards each other. This AA* + B*B2 approach works without protecting groups and opens up a simple and versatile strategy towards hyperbranched aromatic as well as aliphatic polyureaurethanes. Preferential diisocyanates for this synthesis were 2,4-toluylene diisocyanate and isophorone diisocyanate, whereas diethanolamine and diisopropanolamine were used as isocyanate-reactive counterparts.

scholarly journals Ternary composites by an in situ hydrolytic polymerization process

RSC Advances ◽  
2018 ◽  
Vol 8 (26) ◽  
pp. 14713-14721 ◽  
Author(s):  
K. Nagel ◽  
L. Kaßner ◽  
A. Seifert ◽  
R.-E. Grützner ◽  
G. Cox ◽  
...  
Keyword(s):  
Polyamide 6 ◽  
Polymerization Process ◽  
Step Process ◽  
Hydrolytic Polymerization ◽  
One Step

Polyamide 6/silica/polysiloxane composites have been prepared in a one-step process using lactam-substituted silicon monomers.

Primary Study on the Improvement and Application of Formulation Optimization of 2116# Rosin Modified Phenolic Resin

2020 ◽  
Vol 837 ◽  
pp. 168-173
Author(s):  
Qing Zhang ◽  
Li Li Huang ◽  
Mei Ye Wu ◽  
Xiao Zhang Yu
Keyword(s):  
Bisphenol A ◽  
Performance Indicators ◽  
Phenolic Resin ◽  
Raw Materials ◽  
Primary Study ◽  
Step Process ◽  
Technical Performance ◽  
Coating Industry ◽  
One Step ◽  
Printing Ink

2116# Rosin Modified Phenolic Resin is synthesized by means of one-step process taking calcium hydroxide as catalyst and Rosin, Bisphenol A, solid formaldehyde and glycerol as main raw materials. The formulation and process are improved and characterized. The result shows that it satisfies technical performance indicators. And, it is preliminarily applied to ink. This resin is expected to be applied to printing ink and coating industry.

Catalytic Sulfone Upgrading Reaction with Alcohols via Ru(II)

2019 ◽  
Author(s):  
Tomas Vojkovsky ◽  
Shubham Deolka ◽  
Saiyyna P. Stepanova ◽  
Michael C. Roy ◽  
Eugene Khaskin
Keyword(s):  
Functional Groups ◽  
Secondary Alcohol ◽  
Value Added ◽  
Catalytic Dehydrogenation ◽  
Reaction Conditions ◽  
Stoichiometric Amount ◽  
Reaction Proceeds ◽  
One Step ◽  
Value Added Products

<a>Sulfones and sulfonamides with an α-CH bond can be easily alkylated by aliphatic alcohols to add the carbon skeleton of the alcohol via a one-step, Ru(II) catalyzed redox neutral reaction. The reaction requires a sub-stoichiometric amount of base and produces only water as a byproduct. A number of pharmaceutically relevant functional groups such as piperidine, morpholine, etc. are well tolerated under the reaction conditions to give higher value-added products in one step from widely available substrates. The reaction proceeds through a sulfone carbanion addition to an in-situ generated aldehyde formed via catalytic dehydrogenation and subsequent catalyst mediated replacement of the secondary alcohol by hydrogen.</a>

Preparation of Epoxy Resin/Montmorillonite Composites by Monomer Insert In Situ Polymerization

2010 ◽  
Vol 178 ◽  
pp. 236-241
Author(s):  
Jing Xie ◽  
Shang Yue Shen ◽  
Yu Xia Luo ◽  
Meng Meng Zhang ◽  
Ying Chen
Keyword(s):  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Epoxy Resin ◽  
In Situ Polymerization ◽  
Raw Materials ◽  
One Step ◽  
Polymerization Method ◽  
Intercalative Polymerization

Epoxy resin/ montmorillonite (EP/MMT) composite was prepared via monomer insert in-situ polymerization. It was shown that the EP/MMT composites could be successfully synthesized from the raw materials only by one step, making it simpler than traditional in-situ intercalative polymerization method. The d001 spacing of montmorillonite was tested by XRD and increased to 4.30nm. The results showed that tensile strength and impact strength were improved by 98.11 and 93.69%, respectively. The glass transition temperature was increased by 17.3 °C.

Catalytic Sulfone Upgrading Reaction with Alcohols via Ru(II)

2019 ◽  
Author(s):  
Tomas Vojkovsky ◽  
Shubham Deolka ◽  
Saiyyna P. Stepanova ◽  
Michael C. Roy ◽  
Eugene Khaskin
Keyword(s):  
Functional Groups ◽  
Secondary Alcohol ◽  
Value Added ◽  
Catalytic Dehydrogenation ◽  
Reaction Conditions ◽  
Stoichiometric Amount ◽  
Reaction Proceeds ◽  
One Step ◽  
Value Added Products

<a>Sulfones and sulfonamides with an α-CH bond can be easily alkylated by aliphatic alcohols to add the carbon skeleton of the alcohol via a one-step, Ru(II) catalyzed redox neutral reaction. The reaction requires a sub-stoichiometric amount of base and produces only water as a byproduct. A number of pharmaceutically relevant functional groups such as piperidine, morpholine, etc. are well tolerated under the reaction conditions to give higher value-added products in one step from widely available substrates. The reaction proceeds through a sulfone carbanion addition to an in-situ generated aldehyde formed via catalytic dehydrogenation and subsequent catalyst mediated replacement of the secondary alcohol by hydrogen.</a>

scholarly journals In situ biosynthesis of bacterial nanocellulose-CaCO3 hybrid bionanocomposite: One-step process

2016 ◽  
Vol 65 ◽  
pp. 393-399 ◽  
Author(s):  
Faranak Mohammadkazemi ◽  
Marisa Faria ◽  
Nereida Cordeiro
Keyword(s):  
Bacterial Nanocellulose ◽  
Step Process ◽  
One Step

scholarly journals Research of the efficiency of the one-step process for producing carbon steels on the territory of modern Belarus in the pre-industrial period. Foundry production and metallurgy

2021 ◽  
pp. 100-105
Author(s):  
D. V. Andreev
Keyword(s):  
Raw Materials ◽  
Carbon Steels ◽  
Metallurgical Process ◽  
Process Technology ◽  
Furnace Design ◽  
Step Process ◽  
One Step ◽  
The One ◽  
Technological Methods ◽  
Materials Preparation

The article describes experiments on the reconstruction of the technology of the one-step process of obtaining iron-carbon alloys in furnaces based on archaeological sources. It contains the description of furnace design, metallurgical process technology and raw materials preparation. The process of refining the iron bloom by forging is described. Scientifically grounded assumptions are made about possible technological methods of obtaining steels in the pre-industrial period on the territory of modern Belarus.

A Facile One Step Synthesis of 3-(2-oxo-2H-chromen-3-yl)-indeno-[2,1-c]pyridazin-9-one

2005 ◽  
Vol 2005 (4) ◽  
pp. 267-269 ◽  
Author(s):  
V. Rajeswar Rao ◽  
P. Vijaya Kumar
Keyword(s):  
Acetic Acid ◽  
Hydrazine Hydrate ◽  
Single Step ◽  
Step Process ◽  
One Step

3-Acetylcoumarins (1) on reaction with ninhydrin (2) in acetic acid followed by treatment of in situ formed 2-hydroxy-2-[2-oxo-2-(2-oxo-2H-chromen-3-yl)-ethyl]indan-1,3-diones (3) with hydrazine hydrate resulted in the formation of corresponding 3-(2-oxo-2H-chromen-3-yl)-indeno[2,1-c]pyridazin-9-ones (4) in a single step with an excellent yields. The structures of newly synthesised compounds (4) were confirmed by unambiguous synthesis involving a two step process from 3-acetylcoumarins.

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