Interaction of the Components of Mixed Catalysts

Chen, Cheng‐Chi

doi:10.1177/004051759006001107

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…These results support the reaction between the functional groups of serine and the aluminum ion to form a complex to buffer the crosslinking reaction to decrease the reaction kinetics and raise the energies needed to crosslink. Our previous studies2, 19 revealed the formation of a complex between the organic molecules that contain the carboxylic acid and/or other functional groups and the aluminum ion to buffer the crosslinking reaction.…”

Section: Resultsmentioning

confidence: 99%

Crosslinking of cotton cellulose in the presence of serine and glycine. I. Physical properties and reaction kinetics

Yao

Chen

et al. 2005

J of Applied Polymer Sci

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Serine and glycine were used to combine with dimethyloldihydroxyethyleneurea (DMDHEU) as crosslinking agents to study the physical properties of the crosslinked fabrics and the reaction kinetics, and find that the bound nitrogen is in the series of DMDHEU Ͼ Ͼ DMD-HEU-serine Ͼ DMDHEU-glycine at the same resin concentration. The results also show that the wet crease recovery angle (WCRA) value of the treated fabrics for the three crosslinking agent systems is in the series of DMDHEUserine Ͼ DMDHEU-glycine Ͼ DMDHEU alone at a given dry crease recovery angle (DCRA). The DCRA values of the treated fabrics for DMDHEU alone are higher than those for DMDHEU-␣-amino acids for a given value of tensile strength retention (TSR). WCRA values for the various treated fabrics is in the rank of DMDHEU-serine Ͼ DMD-HEU alone Ͼ DMDHEU-glycine at the same TSR. Rate constants for the various crosslinking agents are in the series of DMDHEU-glycine Ͼ DMDHEU-serine Ͼ DMDHEU alone at the given heated temperatures. Energies needed to crosslink and the values of enthalpies and entropies of activation are all DMDHEU-glycine Ͼ DMDHEU-serine Ͼ DM-DHEU alone. Infrared ray (IR) spectra strongly suggest the reaction between DMDHEU and serine and the reaction between the hydroxyl group (cellulose) and serine can occur in the pad-dry-cure process, but only a little for the latter. The reaction between the functional groups of serine and the aluminum ion to form a complex also confirm with IR spectrum.

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Section: Resultsmentioning

confidence: 99%

Crosslinking of cotton cellulose in the presence of serine and glycine. I. Physical properties and reaction kinetics

Yao

Chen

et al. 2005

J of Applied Polymer Sci

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“…Our previous study [7] revealed the complex formed from the interaction between aluminum ion and carboxyl group of tartaric acid in the solution of the mixed aluminum sulfate.…”

Section: Interaction Between the Componentsmentioning

confidence: 99%

“…These results adumbrated that the specific reaction rate constant was affected by the presence of carboxylic acid and amino groups in alpha-amino acid molecules for the kinetic runs. Our previous studies [3,7] pointed out that the carboxylic acid of tartaric acid could interact with aluminum ion to release hydrogen ions to improve the catalytic effect of the crosslinking reaction. The lower values of specific reaction rate constant for the DMDHEU/ alpha-amino acids were suggested by the reason that the interaction between alpha-amino acids and aluminum ion catalyst would decrease the catalytic activity of aluminum ion.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…In this study, the hydrogen ion released from carboxylic acid group of basic alpha-amino acids would be adsorbed by the amine group of alpha-amino acids (equation (2) of Scheme 1) and would not improve the catalytic effect. However, the hydrogen ion released from acid alpha-amino acid would not be adsorbed and could improve the catalytic effect [7] (equation ( 1) of Scheme 1). On the other hand, the catalytic effect of aluminum ion was decreased due to the complex formation of alpha-amino acid and aluminum ion.…”

Section: Interaction Between the Componentsmentioning

confidence: 99%

“…studies [3,7] pointed out that the carboxylic acid of tartaric acid could interact with aluminum ion to release hydrogen ions to improve the catalytic effect, the crease recovery angles and the reaction rate constants. Our previous studies [8,9] showed that the physical properties of the treated fabrics with DMDHEU/alpha-amino acids were changed with the kinds of alpha-amino acids used.…”

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confidence: 99%

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Reaction Mechanism of Dimethyloldihydroxyethyleneurea/ Alpha-amino Acids Co-reactants on the Crosslinking of Cotton Cellulose in the Presence of Aluminum Sulfate Catalyst

Chen

2007

Textile Research Journal

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Cotton fabrics were crosslinked with dimethyloldihydroxyethyleneurea (DMDHEU) alone and DMDHEU/alpha-amino acids. The results showed that the values of nitrogen content, dry crease recovery angle and wet crease recovery angle of the crosslinked fabrics were ranked as DMDHEU > DMDHEU/aspartic acid > DMDHEU/glycine > DMDHEU/arginine under the same concentration of crosslinking agent. The reaction rate constant was also in the rank of DMDHEU > DMDHEU/aspartic acid > DMDHEU/glycine > DMDHEU/arginine. This rank agreed with the number of amine groups on the alpha-amino acids. From the data of free energies of activation, we found that the alpha-amino acids could affect the crosslinking reaction. The transition state complex for DMDHEU alone was significantly different from those for DMDHEU/ alpha-amino acids. From infrared spectra, the interaction between alpha-amino acids and aluminum ion was confirmed. The mechanisms of the interaction between alpha-amino acids and aluminum ion and the condensation reaction mechanisms between DMDHEU and alpha-amino acids are suggested in this study. The higher the number of carboxylic acid groups contained in the alpha-amino acids, the higher the crease recovery angle and reaction rate constant.

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