Preparation of cross-linked poly(vinyl alcohol) films from copolymers with benzoxaborole and carboxylic acid groups, and their degradability in an oxidizing environment

2020 ◽  
Vol 11 (14) ◽  
pp. 2469-2474
Author(s):  
Nao Hakuto ◽  
Katsuya Saito ◽  
Masayuki Kirihara ◽  
Yohei Kotsuchibashi
Keyword(s):  
Carboxylic Acid ◽  
Vinyl Alcohol ◽  
Carboxyl Groups ◽  
Poly Vinyl Alcohol ◽  
Carboxylic Acid Groups

Functionalized PVA films were prepared from copolymers with benzoxaborole and carboxyl groups.

Diffusion of molecular probes and the effects of their interactions with polymer matrices as studied by pulsed-field gradient NMR spectroscopy

2008 ◽  
Vol 86 (6) ◽  
pp. 579-585 ◽  
Author(s):  
Héloise Thérien-Aubin ◽  
Wilms E Baille ◽  
X X Zhu
Keyword(s):  
Nmr Spectroscopy ◽  
Carboxylic Acid ◽  
Field Gradient ◽  
Diffusion Coefficients ◽  
Molecular Probes ◽  
Poly Vinyl Alcohol ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion ◽  
Carboxylic Acid Groups

Pulsed-field gradient NMR spectroscopy was used to study the interactions between small molecular probes and polymers bearing interacting groups. The self-diffusion coefficients of ethylene glycol and its oligomers and their methyl ester derivatives in poly(vinyl alcohol) gels were measured to study the effect of hydrogen bonding. The self-diffusion coefficients of small molecular probes containing hydroxyl, amine, and carboxylic acid groups were determined in several polymer matrices including poly(vinyl alcohol), poly(allylamine), and poly(acrylic acid) bearing lateral hydroxyl, amine, and carboxylic acid groups, respectively. The ionic interactions between the functional groups of the diffusants and of the polymers exhibited a marked effect on the diffusion of the molecular probes. For example, the reduced self-diffusion coefficients measured for a diffusant with a carboxylic acid group in a poly(allylamine) matrix were shown to be lower even though the molecular masses of the diffusants are similar.Key words: pulsed-field gradient NMR spectroscopy, self-diffusion, intermolecular interactions.

Microparticles of Functionalized Polylactide Copolymers

1997 ◽  
Vol 501 ◽  
Author(s):  
K. E. Gonsalves ◽  
S. Jin ◽  
M-I Baraton
Keyword(s):  
Carboxylic Acid ◽  
Aspartic Acid ◽  
Room Temperature ◽  
Poly Vinyl Alcohol ◽  
Ionic Surfactant ◽  
Particle Sizes ◽  
Serine Residue ◽  
Aspartic Acid Residue ◽  
Carboxylic Acid Groups ◽  
Hydroxy Groups

ABSTRACTMicroparticles of poly(lactide) (PLac) and its copolymers with the amino acids, serine (P(Lac- Ser)), and aspartic acid (P(Lac-Asp)), respectively, were synthesized using the solvent evaporation microemulsion technique. Poly(vinyl alcohol) (PVA) was added as a non-ionic surfactant to stabilize the particles. The particle sizes are in the range of 200 nm. The surface of the particles was characterized by FTIR transmission spectroscopy under evacuation at room temperature and at 200°C. Hydroxy groups originating from PVA exist on the surfaces of the particles and they were observed at 3506 cm−1. Free hydroxy groups originating from the serine residue pendant to the copolymer P(Lac-Ser) backbone were observed at 3396 cm−1. Also, free carboxylic acid groups pendant to the copolymer P(Lac-Asp) backbone, originating from the aspartic acid residue, were observed at 3387 cm−1. The appearance of the free hydroxy or carboxylic acid groups in the IR spectra also showed that these hydrophilic functional groups moved to the surface of the particles in the process of microemulsion.

Evidence for Chemical Interaction in Carbon and Polymer Associations. Butyl and Acidic Oxy Blacks. The Possible Role of Carboxylic Acid Groups on the Black

1969 ◽  
Vol 42 (3) ◽  
pp. 850-857 ◽  
Author(s):  
A. M. Gessler
Keyword(s):  
Carboxylic Acid ◽  
Chemical Interaction ◽  
Interaction Mechanism ◽  
Carboxyl Groups ◽  
Carboxylic Acid Groups

Abstract Assuming that the enhanced reinforcement capacity of oxidized black in butyl is related specifically to acidity provided by carboxyl groups on the surface of the black, the black was neutralized by esterification and saponification, respectively. The reduced carbon-polymer bonding activity resulting from these neutralizations is discussed in the light of the cationic interaction mechanism which it is proposed is involved.

scholarly journals Protonation of carboxyl groups in EuDOTA-tetraamide complexes results in catalytic prototropic exchange and quenching of the CEST signal

2017 ◽  
Vol 375 (2107) ◽  
pp. 20170113 ◽  
Author(s):  
Lei Zhang ◽  
Osasere M. Evbuomwan ◽  
Michael Tieu ◽  
Piyu Zhao ◽  
Andre F. Martins ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Water Molecule ◽  
Bound Water ◽  
Bulk Water ◽  
Proton Exchange ◽  
Ethyl Esters ◽  
Carboxyl Groups ◽  
Carboxylic Acid Groups ◽  
Coordination Isomers ◽  
Ph Range

The CEST properties of EuDOTA-tetraamide complexes bearing pendant carboxylate and carboxyl ethyl esters were measured as a function of pH. The CEST signal from the Eu 3+ -bound water molecule decreased in intensity between pH 8.5 and 4.5 while the proton exchange rates ( k ex ) increased over this same pH range. In comparison, the CEST signal in the corresponding carboxyl ester derivatives was nearly constant. Both observations are consistent with stepwise protonation of the four carboxylic acid groups over this same pH range. This indicates that negative charges on the carboxyl groups above pH 6 facilitate the formation of a strong hydrogen-bonding network in the coordination second sphere above the single Eu 3+ -bound water molecule, thereby decreasing prototropic exchange of protons on the bound water molecule with bulk water protons. The percentage of square antiprismatic versus twisted square antiprism coordination isomers also decreased as the appended carboxylic acid groups were positioned further away from the amide. The net effect of lowering the pH was an overall increase in k ex and a quenching of the CEST signal. This article is part of the themed issue ‘Challenges for chemistry in molecular imaging’.

High modulus poly (vinyl alcohol) fibers by zone drawing

1986 ◽  
Vol 1 (6) ◽  
pp. 861-869 ◽  
Author(s):  
Paul D. Garrett ◽  
David T. Grubb
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
High Modulus

BIODEGRADATION BEHAVIOR OF POLY(VINYL ALCOHOL) - WOOD COMPOSITES

2019 ◽  
Vol 18 (1) ◽  
pp. 125-136 ◽  
Author(s):  
Luiza Jecu ◽  
Iuliana Raut ◽  
Elena Grosu ◽  
Mariana Calin ◽  
Violeta Purcar ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Wood Composites
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