Lauryl Trimethyl Ammoniums with New Type Counteranions

2011

J Surfact & Detergents

The preparations of quaternary ammonium compounds from various tertiary amines and the (environmentally friendly) alkylation agent dimethyl carbonate were carried out. The effects of reaction temperature, reaction time, material mol ratio and solvent dosage on quaternization were examined, and the optimum reaction conditions were determined. Under the optimum conditions, the conversions of mono-alkyl tertiary amines could attain over 99%, while the conversions of di-alkyl tertiary amines reached over 95%. Moreover, a series of quaternary ammonium salts with new counterions (HCO 3 , CH 3 COO, CH 3 CH 2 COO, CH 3 CH(OH)COO) were synthesized by the hydrolysis of methyl carbonate quaternary ammonium salts or by ion exchange reaction of methyl carbonate quaternary ammonium salts with corresponding acids.

Section: Introductionmentioning

confidence: 99%

Synthesis of Quaternary Ammonium Salts with Novel Counterions

2011

J Surfact & Detergents

“…[8] The surfactant solutions were prepared the same way as that in the surface tension test; the sample solutions were also kept for 2 hours in thermostatic refrigerated shaker at 25 AE 0.2 C before their contact angle measurement. 5 mL test solutions by a microinjector dripped into a paraffin film, and then, using a JJ2000A contact angle meter (Powereach, China) measured the contact angle (h).…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…[6,7] By this way, many kinds of QAS could be synthesized and these novel QAS possessed special performances. [8] Obviously, the development of various novel QAS and their derivatives seem to be worth more attention.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Tetradecyltrimethylammonium Carboxylates

Yan

Journal of Dispersion Science and Technology

2013

A series of tetradecyltrimethylammonium carboxylates based on the general formula-CH 3 (CH 2 ) 12 CH 2 N þ (CH 3 ) 3 Á -OOCCH 2 (CH 2 ) n CH 2 CH 3 (n ¼ 4, 6, 8) were synthesized. The tetradecyldimethylamines were quaternized with dimethyl carbonate, followed by reaction with different carboxylic acids to prepare the tetradecyltrimethylammonium carboxylates, and their structures were characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. The critical micelle concentration and the minimum surface tension of these surfactants were also studied. The results indicated that the prepared surfactants could reduce the surface tension of water to 21-26 mN/m at concentration levels of 10 À4 mol/L. Furthermore, their wetting ability and emulsifying ability were also investigated.

“…In order to break this bottleneck, researchers have began to focus on a green quaternization agent-dimethyl carbonate (DMC) [5]. Meanwhile, a useful compound derived from quaternary ammonium salts methyl carbonates (QASMC), has been synthesized from DMC and a tertiary amine [6,7]. Compared to the conventional QAS, this kind of QASMC can easily react with different acids to prepare the QAS with novel counterions due to the weak acidity of counterions arising from monomethyl carbonates groups.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the conventional QAS, this kind of QASMC can easily react with different acids to prepare the QAS with novel counterions due to the weak acidity of counterions arising from monomethyl carbonates groups. In this way, many kinds of QAS were able to be prepared and these novel QAS possess special characteristics [6]. It is obvious that the relationships between the structures of the counterions and their properties should be given more attention.…”

Section: Introductionmentioning

confidence: 99%

Properties of the Quaternary Ammonium Salts with Novel Counterions

Yan

2012

J Surfact & Detergents

The Krafft temperatures, surface tensions and bacteriostatic efficacies of a series of dodecyl/tetradecyltrimethylammonium salts with new type counterions based on the general formula RN+(CH3)3 A− were measured. The results revealed that the Krafft temperatures of the studied products were below 0 °C and the surface tensions of water were decreased to 22–42 mN m−1 when applying these surfactants at a concentration range from 10−2 to 10−4 mol L−1. Moreover, the physicochemical parameters such as the saturation adsorption value, the minimum area per surfactant molecule and the standard thermodynamic parameters of adsorption and micellization varied with different counterions for these prepared quaternary ammonium salts. In addition, the bacteriostatic tests showed that the counterions with shorter carbon chain lengths were associated with greater efficacy for the novel quaternary ammonium salts studied here.