Reference

Mixed micellar systems of n-alkyl-b-D glucopyranosides with hexadecyl cationic surfactants

All Rights Reserved. Mixed micellar systems of n-alkyl-b-D glucopyranosides with hexadecyl cationic surfactants.Several substances are used for example 14866-43-4 and 59122-55-3 which are their cas registry numbers. Rodgers, C.; Moulins, J.; Palepu, R. (Department of Chemistry, St. Francis Xavier University, Antigonish, NS B2G 2W3, Can.). Tenside, Surfactants, Detergents, 43(6), 310-316 (English) 2006 Carl Hanser Verlag. CODEN: TSDEES. ISSN: 0932-3414. DOCUMENT TYPE: Journal CA Section: 46 (Surface Active Agents and Detergents) Crit. micelle concns. (cmc) were obtained from tensiometric method on binary mixts. of decyl and dodecyl glucopyranoside nonionic surfactants with hexadecyl-triphenyl and tri-Bu phosphonium bromide and trimethylammonium bromide surfactants in aq. media. The cmc data have been analyzed in the context of pseudophase sepn. model. The interaction parameter (b) detd. by using the regular soln. theory (RST) was found to be neg. and compn. dependent. The values of interaction parameters were found to be more neg. for C10 glucopyranoside mixts. Employing Maeda's Theory, the chain/chain contribution parameter B1 was obtained and related to the Gibbs free energy of mixed micelle formation. Thermodn. of adsorption, surface excess and min. area occupied by surfactant mols. were also evaluated. .

Synthesis and characterization of poly(ethylene terephthalate)/attapulgite nanocomposites

All Rights Reserved. Synthesis and characterization of poly(ethylene terephthalate)/attapulgite nanocomposites. Yuan, Xuepei; Li, Chuncheng; Guan, Guohu; Liu, Xiaoqing; Xiao, Yaonan; Zhang, Dong (CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Center for Molecular Science, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, Peop. Rep. China). Journal of Applied Polymer Science, 103(2), 1279-1286 (English) 2007 John Wiley & Sons, Inc. CODEN: JAPNAB. ISSN: 0021-8995. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) A kind of clay with fibrous morphol., attapulgite (AT), was used to prep.Several reagents with their cas registry numbers 14866-43-4 and 12174-11-7 are used here. poly (ethylene terephthalate) (PET)/AT nanocomposites via in situ polymn. Attapulgite was modified with hexadecyl triphenylphosphonium bromide and silane coupling agent 3-glycidoxypropyltrimethoxysilane to increase the dispersion of clay particles in polymer matrix and the interaction between clay particles and polymer matrix. FTIR and TGA test of the org.-AT particles investigated the thermal stability and the loading quantity of org. reagents. XRD patterns and SEM micrographs showed that the org. modification was processed on the surface of rod-like crystals and did not shift the crystal structure of silicate. It was revealed that the fibrous clay can be well dispersed in polymer matrix with the rod-like crystals in the range of nanometer scale. The diam. of rod-like crystal is about 20 nm and the length is near to 500 nm. The addn. of the clay particles can enhance the thermal stability and crystn. rate of PET. With the addn. of clay in PET matrix, the flexural modulus of those composites was also increased markedly. .