Lipoates as building blocks of sulfur-containing branched macromolecules

2015 ◽  
Vol 6 (39) ◽  
pp. 6936-6945 ◽  
Author(s):  
Houliang Tang ◽  
Nicolay V. Tsarevsky
Keyword(s):  
Radical Polymerization ◽  
Building Blocks ◽  
Degradable Polymers ◽  
Ene Reactions ◽  
Step Growth ◽  
Sulfur Containing ◽  
Polymerization Conditions

Under radical polymerization conditions, 2-acryloyloxyethyl lipoate (AOELp) yielded, prior to gelation, soluble, highly branched, reductively degradable disulfide-containing polymers. The reduction of AOELp afforded a dithiol acrylate, which participated in radical or ionic step-growth thiol-ene reactions, yielding highly branched reductively non-degradable polymers with thioether-type sulfur atoms in the backbones.

Sequence-Controlled Vinyl Polymers by Transition Metal-Catalyzed Step-Growth and Living Radical Polymerizations

2014 ◽  
Vol 1613 ◽  
pp. 17-21
Author(s):  
Kotaro Satoh ◽  
Masami Kamigaito
Keyword(s):  
Radical Polymerization ◽  
Building Blocks ◽  
Vinyl Monomers ◽  
Vinyl Polymers ◽  
Living Radical Polymerizations ◽  
Step Growth ◽  
Novel Strategy ◽  
Metal Catalyzed ◽  
Polymeric Structures ◽  
Step Polymerization

ABSTRACTThe metal-catalyzed step-growth radical polymerization was achieved to enable two systems for preparing tailored polymeric structures, i.e., sequence-regulated vinyl copolymer and periodically-functionalized polymer. The former is a novel strategy for preparing sequence-regulated vinyl copolymers by step-polymerization of sequence-regulated vinyl oligomers prepared from common vinyl monomers as building blocks. The later deals the simultaneous chain- and step-growth radical polymerization, which resulted in the polymers with periodic functional groups.

Versatile procedure for site-specific grafting of polymer brushes on patchy particles via atom transfer radical polymerization (ATRP)

2016 ◽  
Vol 7 (16) ◽  
pp. 2858-2869 ◽  
Author(s):  
Bas G. P. van Ravensteijn ◽  
Willem K. Kegel
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Polymer Brushes ◽  
Building Blocks ◽  
Atom Transfer ◽  
Site Specific ◽  
Patchy Particles

Combining chemically anisotropic colloids with Surface-Initiated ATRP enables for site-specific grafting of p(NIPAM) brushes. The resulting, partially grafted particles are employed as colloidal building blocks for finite-sized clusters.

Tuning “thiol-ene” reactions toward controlled symmetry breaking in polyhedral oligomeric silsesquioxanes

2014 ◽  
Vol 5 (3) ◽  
pp. 1046-1053 ◽  
Author(s):  
Yiwen Li ◽  
Kai Guo ◽  
Hao Su ◽  
Xiaopeng Li ◽  
Xueyan Feng ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Building Blocks ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Ene Reactions ◽  
Oligomeric Silsesquioxane

A facile method toward polyhedral oligomeric silsesquioxane-based nano-building blocks with controlled symmetry breaking was reported by using thiol-ene chemistry.

Sulfur-containing initiators and coinitiators of free radical polymerization

2003 ◽  
Vol 159 (2) ◽  
pp. 115-125 ◽  
Author(s):  
Jerzy Pączkowski ◽  
Zdzisław Kucybała ◽  
Franciszek Ścigalski ◽  
Andrzej Wrzyszczyński
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Sulfur Containing

A Switchable Domino Process for the Construction of Novel CO 2 ‐Sourced Sulfur‐Containing Building Blocks and Polymers

2019 ◽  
Vol 58 (34) ◽  
pp. 11768-11773 ◽  
Author(s):  
Farid Ouhib ◽  
Bruno Grignard ◽  
Elias Van Den Broeck ◽  
André Luxen ◽  
Koen Robeyns ◽  
...  
Keyword(s):  
Building Blocks ◽  
Sulfur Containing

Study on the Reaction of TDI and PPG with Organo-Tin Mixed Catalyst

2011 ◽  
Vol 418-420 ◽  
pp. 13-17
Author(s):  
Su Ran Liao ◽  
Yuan Wei ◽  
Yu Qi Zhang ◽  
Meng Zhang ◽  
Gao Fei Feng
Keyword(s):  
Molecular Weight ◽  
Hydrogen Bonding ◽  
Average Molecular Weight ◽  
Polypropylene Glycol ◽  
Number Average Molecular Weight ◽  
Mixed Catalyst ◽  
Back Titration ◽  
Step Growth ◽  
Step Growth Polymerization ◽  
Polymerization Conditions

The study of polyurethanes are of continuing interest due to their excellent physical properties. In this study, the reaction kinetics and polymerization conditions in two-step process of toluene diisocyante (TDI) and polypropylene glycol (PPG) with organo-tin mixed catalyst were investigated by di-n-butylamine back-titration. It was showed that the reaction obeyed the second-order equation of step-growth polymerization, the rate constants of TDI and PPG reaction at 50, 60 and 70°C were 0.0922, 0.3373 and 0.5828 kg•mol-1•min-1，respectively. The activation energy obtained from the result was 71.63 kJ•mol-1. The number average molecular weight (Mn) and molecular-weight distribution (Mw/Mn) of the polyurethane were 45175 and 1.53, respectively, and the content of hydrogen bonding in the N-H group from Fourier transform infrared spectrum (FTIR) was 80.75%, which manifested that the large amount of N-H were present in hydrogen bonding.

Synthesis, characterization and environmental applications of nanocrystalline zeolites

2017 ◽  
Author(s):  
Vicki H. Grassian ◽  
Sarah C. Larsen
Keyword(s):  
Catalytic Reduction ◽  
Organic Phosphorus ◽  
Environmental Contaminants ◽  
Building Blocks ◽  
Environmental Applications ◽  
Environmental Catalysis ◽  
Hierarchical Zeolite ◽  
Volatile Organic ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds

This article describes the synthesis, characterization and environmental applications of nanocrystalline zeolites. It begins by considering the use of nanocrystalline zeolites as building blocks in the preparation of hierarchical zeolite structures, followed by a discussion of the synthesis of silicalite-1 with systematically varied crystal sizes, along with the synthesis of nanocrystalline aluminosilicates, NaZSM-5 and NaY. It then looks at the various applications of nanozeolites and hierarchical zeolite structures for environmental catalysis, adsorption of volatile organic compounds and other environmental contaminants, selective catalytic reduction of nitrogen oxide, and decontamination of organic phosphorus and sulfur-containing compounds. It also examines the unique properties and reactivity of nanocrystalline zeolites and concludes by assessing their potential for future environmental applications.

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