1] of a carboxylic group
(C=O ester stretch from methyl ester group with its deformation vibration) are observed that can probably be attributed to FAME.
Further, Carboxylic group
functionalized CNTs (200mg) were dispersed into above prepared solution by keeping continuous stirring for another 10 minutes.
The known Ca-acetate method (Tan, 2005), based on the formation of acetic acid, was used for determining the total number of carboxylic groups
In this study, two methods were used for determining the carboxylic group
's distribution: conductometry to evaluate the number of carboxylic groups
on the surface of the latex particles, and titration with NaOH in methanol solution to determine the number of carboxylic groups
inside and on the surface of the latex particles.
The contents of carboxylic groups
in the samples were estimated empirically from the Q (the sample charge) v.
in MAA become ionized above its [pK.
The neutralizer of the carboxylic groups
, needed to get a stable dispersion, plays a key role in both the polymerization kinetics and in the hydrophilic character of the UV-cured polymer, the best performance being achieved by using a volatile tertiary amine.
The presence of carboxylic groups
in PAA chains confers a polyanionic character to the macromolecule, allowing for ion exchanging and complexation with positively charged ions .
Specific surface area, density of carboxylic group
, and the recovery rate after HN[O.
1] is assigned to O--H stretch of carboxylic group
on the surface of BTC-MWCNT (16).
In the case of pure INM and PM, pH-dependence is due to the ionizable character of the carboxylic group
Oxidation of the aldehyde group on C-1 of b-d glucose to a carboxylic group
results in the production of glucono lactone (C6H10O6) which is hydrolyzed to gluconic acid .
Since the carboxylate group is electronegative in water, higher carboxylate concentrations will lead to repulsion among these groups and a decrease of water absorbency, although carboxylate group have better water absorbency than carboxylic group
The esterification of acids with alcohols is a reversible reaction with a well-known mechanism (1, 2) Two reaction mechanisms through a tetrahedral intermediate and acyl-oxygen cleavage BAc-2 and AAc-2 are most common and require a nucleophilic attack of a hydroxylic nucleophile on the carbonyl double bond of the carboxylic or protonated carboxylic group
With screw configuration A1, the free radical grafting of GMA onto PP is disturbed by the presence of PBT: this latter dilutes the concentrations of GMA and PP reducing the grafting rate; more importantly, aside from the desired free radical grafting of GMA onto PP with the subsequent reaction with PBT, the free GMA monomer also reacts with PBT (mostly with the carboxylic group
at its chain end).