Synthesis of dual-functional poly(6-azidohexylmethacrylate) brushes by a RAFT agent carrying carboxylic acid end groups

2015 ◽  
Vol 53 (14) ◽  
pp. 1696-1706 ◽  
Author(s):  
Dilek Cimen ◽  
Ertan Yildirim ◽  
Tuncer Caykara
Keyword(s):  
Carboxylic Acid ◽  
Dual Functional ◽  
End Groups ◽  
Raft Agent

Stabilization of perfluoropolyethers (PFPEs) with acyl fluoride and carboxylic acid end-groups by UV-irradiation

2019 ◽  
Vol 156 ◽  
pp. 44-49 ◽  
Author(s):  
Saurabh Saxena ◽  
Prateek Malik ◽  
Ajay K. Tyagi ◽  
Geetha Seshadri ◽  
Uttam Kumar Mandal
Keyword(s):  
Carboxylic Acid ◽  
Uv Irradiation ◽  
End Groups

scholarly journals A triple carboxylic acid-functionalized RAFT agent platform for the elaboration of well-defined telechelic 3-arm star PDMAc

2016 ◽  
Vol 52 (9) ◽  
pp. 1847-1850 ◽  
Author(s):  
K. Belal ◽  
S. Poitras-Jolicoeur ◽  
J. Lyskawa ◽  
G. Pembouong ◽  
G. Cooke ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Star Polymers ◽  
Agent Platform ◽  
Raft Agent

This communication describes the synthesis of a triple acid-functionalized RAFT agent and its use to prepare well-defined 3-arm star polymers of N,N-dimethylacrylamide (DMAc).

scholarly journals Tuning the Properties of Hydrogen-bonded Block Copolymer Worm Gels Prepared via Polymerization-Induced Self-Assembly

2021 ◽  
Author(s):  
Eleanor Raphael ◽  
Matthew J Derry ◽  
Michael Hippler ◽  
Steven P Armes
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Block Copolymer ◽  
Self Assembly ◽  
Raft Agent ◽  
Stearyl Methacrylate ◽  
Hydrogen Bonded

Polymerization-induced self-assembly (PISA) is exploited to design hydrogen-bonded poly(stearyl methacrylate)-poly(benzyl methacrylate) [PSMA-PBzMA] worm gels in n-dodecane. Using a carboxylic acid-based RAFT agent facilitates hydrogen bonding between neighboring worms to produce...

Versatile synthesis of comb-shaped poly(lactic acid) copolymers with poly(acrylic acid)-based backbones and carboxylic acid end groups

2017 ◽  
Vol 111 ◽  
pp. 79-87 ◽  
Author(s):  
Pavel Kucharczyk ◽  
Jiri Zednik ◽  
Petr Humpolicek ◽  
Zdenka Capakova ◽  
Vladimir Sedlarik
Keyword(s):  
Lactic Acid ◽  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Poly Lactic Acid ◽  
End Groups ◽  
Poly Acrylic Acid

scholarly journals Synthesis of multivalent carbohydrate mimetics with aminopolyol end groups and their evaluation as L-selectin inhibitors

2015 ◽  
Vol 11 ◽  
pp. 638-646 ◽  
Author(s):  
Joana Salta ◽  
Jens Dernedde ◽  
Hans-Ulrich Reissig
Keyword(s):  
Nmr Spectroscopy ◽  
Carboxylic Acid ◽  
Amide Bonds ◽  
H Nmr ◽  
End Groups ◽  
Full Conversion ◽  
Purification Protocol ◽  
Micromolar Range

In this article a series of divalent and trivalent carbohydrate mimetics on the basis of an enantiopure aminopyran and of serinol is described. These aminopolyols are connected by amide bonds to carboxylic acid derived spacer units either by Schotten–Baumann acylation or by coupling employing HATU as reagent. The O-sulfation employing the SO3·DMF complex was optimized. It was crucial to follow this process by 700 MHz 1H NMR spectroscopy to ensure full conversion and to use a refined neutralization and purification protocol. Many of the compounds could not be tested as L-selectin inhibitor by SPR due to their insolubility in water, nevertheless, a divalent and a trivalent amide showed surprisingly good activities with IC50 values in the low micromolar range.

Polyethylene glycol oligomers as siloxane modificators in consolidation of carbonate stones

2016 ◽  
Vol 88 (12) ◽  
pp. 1117-1128 ◽  
Author(s):  
Bruno Sena da Fonseca ◽  
Susana Piçarra ◽  
Ana Paula Ferreira Pinto ◽  
Maria de Fátima Montemor
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Carboxylic Acid ◽  
Sol Gel ◽  
Silica Matrix ◽  
Strength Increase ◽  
Molecular Weights ◽  
Uniform Strength ◽  
End Groups ◽  
Stone Consolidants

AbstractThe overall performance of alkoxysilanes as stone consolidants is constrained by stone mineralogy (particularly in the carbonate varieties) and by their tendency to crack during drying. In an attempt to overcome these problems, polyethylene glycol “chains” with two carboxylic acid end-groups (PEG-CA) were introduced in siloxane sols obtained by sol-gel chemistry using tetraethoxysilane (TEOS) as precursor. Different pre-condensation degrees (by varying the stirring times of sol-gel reaction: 10 min, 2, and 24 h) and PEG-CA chains with different molecular weights were studied as variables affecting the initial efficacy of the consolidants when applied into a limestone. The sol containing siloxanes with the lowest pre-condensation degree (10 min stirring) was quite susceptible to the carbonate media and thus a poor consolidation was achieved. The sol with the highest pre-condensation degree (24 h stirring) together with the PEG-CA chains with intermediate molecular weight produced significant and uniform strength gains along the stone depth. The consolidation also showed to be highly dependent on the molecular weight of the PEG-CA chains, the PEG-CA with highest molecular weight produced a non-uniform strength increase with potential harmful side effects. The results confirmed the role of carboxylic acid end-groups as efficient sol-gel catalysts and their ability to be incorporated into the silica matrix in the presence of carbonate stone.

The Norrish Type II Photodecomposition of Di-n-Butyl Terephthalate

1971 ◽  
Vol 49 (17) ◽  
pp. 2916-2917 ◽  
Author(s):  
M. Day ◽  
D. M. Wiles
Keyword(s):  
Liquid Phase ◽  
Carboxylic Acid ◽  
Quantum Yields ◽  
Type Ii ◽  
Photochemical Rearrangement ◽  
Norrish Type ◽  
End Groups ◽  
Rearrangement Reaction

The liquid phase photolysis of undiluted di-n-butyl terephthalate yields 1-butene and carboxylic acid end groups as a result of a Norrish Type II photochemical rearrangement reaction. Quantum yields for the production of these two products have been determined and found to be [Formula: see text] and [Formula: see text] in vacuum and [Formula: see text] and [Formula: see text] in air.

scholarly journals pH-Responsive Non-Ionic Diblock Copolymers: Ionization of Carboxylic Acid End-Groups Induces an Order-Order Morphological Transition

2014 ◽  
Vol 127 (4) ◽  
pp. 1295-1299 ◽  
Author(s):  
Joseph R. Lovett ◽  
Nicholas J. Warren ◽  
Liam P. D. Ratcliffe ◽  
Marzena K. Kocik ◽  
Steven P. Armes
Keyword(s):  
Carboxylic Acid ◽  
Diblock Copolymers ◽  
Morphological Transition ◽  
Ph Responsive ◽  
End Groups
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