Preparation and Characterization of Functional Alkoxysilanes via Catalyst-Free Aza-Michael Reaction

2017 ◽  
Vol 2 (13) ◽  
pp. 3721-3724 ◽  
Author(s):  
Linglong Feng ◽  
Siyu Zhu ◽  
Wenyu Zhang ◽  
Kai Mei ◽  
Hua Wang ◽  
...  
Keyword(s):  
Michael Reaction ◽  
Catalyst Free

Preparation and characterization of silicone rubber cured via catalyst-free aza-Michael reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 111648-111656 ◽  
Author(s):  
Linglong Feng ◽  
Lin Zhou ◽  
Shengyu Feng
Keyword(s):  
Silicone Rubber ◽  
Michael Reaction ◽  
High Strength ◽  
Catalyst Free ◽  
Stable Dimension

A novel silicone rubber of high strength and stable dimension was cured via catalyst-free aza-Michael reaction.

Catalyst-free synthesis and mechanical characterization of TaC nanowires

2021 ◽  
Vol 64 (5) ◽  
Author(s):  
Shiliang Wang ◽  
Liang Ma ◽  
James Lee Mead ◽  
Shin-Pon Ju ◽  
Guodong Li ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Catalyst Free

scholarly journals Solvent- and Catalyst-free Synthesis, Hybridization and Characterization of Biobased Nonisocyanate Polyurethane (NIPU)

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1026 ◽  
Author(s):  
Xin He ◽  
Xiaoling Xu ◽  
Qian Wan ◽  
Guangxu Bo ◽  
Yunjun Yan
Keyword(s):  
Raw Materials ◽  
Ethylene Carbonate ◽  
Synthetic Method ◽  
Dimer Acid ◽  
Catalyst Free ◽  
Program Temperature ◽  
Novel Method ◽  
Nonisocyanate Polyurethane ◽  
High Degree

Nonisocyanate polyurethane (NIPU) is a research hotspot in polyurethane applications because it does not use phosgene. Herein, a novel method of solvent- and catalyst-free synthesis of a hybrid nonisocyanate polyurethane (HNIPU) is proposed. First, four diamines were used to react with ethylene carbonate to obtain four bis(hydroxyethyloxycarbonylamino)alkane (BHA). Then, BHA reacted with dimer acid under condensation in the melt to prepare four nonisocynate polyurethane prepolymers. Further, the HNIPUs were obtained by crosslinking prepolymers and resin epoxy and cured with the program temperature rise. In addition, four amines and two resin epoxies were employed to study the effects and regularity of HNIPUs. According to the results from thermal and dynamic mechanical analyses, those HNIPUs showed a high degree of thermal stability, and the highest 5% weight loss reached about 350 °C. More importantly, the utilization of these green raw materials accords with the concept of sustainable development. Further, the synthetic method and HNIPUs don’t need isocyanates, catalysts, or solvents.

FLP behaviour of cationic titanium complexes with tridentate Cp,O,N-ligands: highly efficient syntheses and activation reactions of C–X bonds (X = Cl, F)

2019 ◽  
Vol 48 (4) ◽  
pp. 1516-1523 ◽  
Author(s):  
Malte Fischer ◽  
Kevin Schwitalla ◽  
Svenja Baues ◽  
Marc Schmidtmann ◽  
Ruediger Beckhaus
Keyword(s):  
Michael Reaction ◽  
Titanium Complexes ◽  
Catalyst Free ◽  
Highly Efficient ◽  
Convenient Synthesis ◽  
Ligand Precursors

Titanium FLPs! Solvent- and catalyst-free Aza-Michael reaction provides β-amino ketones which were employed as ligand precursors for the convenient synthesis of novel cationic titanium complexes with tridentate Cp,O,N-ligand frameworks, which activate C–X bonds in a FLP-like manner.

Catalyst-free synthesis and characterization of boron nitride whiskers and nanotubes

2011 ◽  
Vol 65 (12) ◽  
pp. 1791-1793 ◽  
Author(s):  
L.L. Sartinska ◽  
A.A. Frolov ◽  
A.F. Andreeva ◽  
A.M. Kasumov ◽  
I.I. Timofeeva ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Synthesis And Characterization ◽  
Catalyst Free

Metal-catalyst-free Growth and Characterization of Nitrogen-doped Carbon Nanotubes

2011 ◽  
Vol 26 (8) ◽  
pp. 881-884 ◽  
Author(s):  
Can WANG ◽  
Liang ZHAN ◽  
Zhen-Hong HUANG ◽  
Wen-Ming QIAO ◽  
Xiao-Yi LIANG ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Catalyst ◽  
Nitrogen Doped ◽  
Catalyst Free ◽  
Free Growth ◽  
Nitrogen Doped Carbon

Synthesis and Characterization of Reactive Energetic Plasticizers for Poly(glycidyl azide-co-tetramethylene glycol)-Based Polyurethane Binders

2021 ◽  
Vol 21 (7) ◽  
pp. 4110-4115
Author(s):  
Yechen Shen ◽  
Younghwan Kwon
Keyword(s):  
Click Reaction ◽  
Point Of View ◽  
Dipolar Cycloaddition ◽  
Synthesis And Characterization ◽  
Catalyst Free ◽  
Energetic Plasticizers ◽  
Glycidyl Azide

Two reactive energetic plasticizers, 3-((2,2-dinitropropoxy)methoxy)prop-1-yne and 4-((2,2-dinitropropoxy)methoxy)but-1-yne which can react with an azido-containing poly(glycidyl azide-co-tetramethylene glycol) prepolymer by cupper-free 1,3-dipolor cycloaddition (“Click”) reaction, were synthesized and characterized, in order to investigate their plasticizing performance and catalyst-free 1,3-dipolar cycloaddition reactivity on energetic polyurethane binders. Two reactive energetic plasticizers showed better plasticizing performance than commercial energetic plasticizers. In the reactivity point of view, 3-((2,2-dinitropropoxy)methoxy)prop-1-yne exhibited higher Click reactivity than 4-((2,2-dinitropropoxy)methoxy)but-1-yne. Two synthesized plasticizers were found to fulfill the requirements for use as reactive energetic plasticizers.

Preparation and optical characterization of catalyst free SiO2 sonogel hybrid materials

2006 ◽  
Vol 41 (3) ◽  
pp. 277-289 ◽  
Author(s):  
Omar G. Morales-Saavedra ◽  
Ernesto Rivera ◽  
José O. Flores-Flores ◽  
Rosalba Castañeda ◽  
José G. Bañuelos ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Optical Characterization ◽  
Catalyst Free
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