Ethyl(hydroxyethyl)cellulose-cationic surfactant interactions: electrical conductivity, self-diffusion and time-resolved fluorescence quenching investigations

Zana, R.; Binana-Limbelé, W.; Kamenka, N.; Lindman, Björn

doi:10.1021/j100192a050

Cited by 97 publications

(97 citation statements)

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“…[4] Mixtures of sodium dodecyl sulfate (SDS) with hydrophobi-cally modified PEO or (PEOpolypropyleneoxide-PEO) block copolymers, and also cationic surfactants with ethyl hydrox-yethyl cellulose, have been studied by this technique (25)(26)(27)(28)(29). We first analyze the interaction of each surfactant (i.e., SDS, C 10 E 5 , or LAPB) with PVP, before considering the more complex mixtures of PVP with two surfactants.…”

Section: Self-diffusion Coefficient For Single Surfactantmentioning

confidence: 99%

Investigation of the Interactions of Polyvinylpyrrolidone with Mixtures of Anionic and Nonionic Surfactants or Anionic and Zwitterionic Surfactants by Pulsed Field Gradient NMR

Misselyn-Bauduin

Thibaut

Grandjean

et al. 2001

Journal of Colloid and Interface Science

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The interaction of polyvinylpyrrolidone (PVP) with an anionic surfactant (sodium dodecyl sulfate, SDS), a nonionic surfactant (pentaethylene glycol monodecyl ether, C 10 E 5 ), and a zwitterionic surfactant (lauryl amido propyl betaine, LAPB) has been investigated by means of pulsed gradient spin-echo NMR (FT-PGSE NMR), allowing self-diffusion coefficients to be determined. The results confirm the strong interaction prevailing in the PVP/SDS system, whereas no association has been observed in the PVP/C 10 E 5 and PVP/LAPB systems. Mixing PVP with two surfactants, namely SDS and C 10 E 5 or SDS and LAPB, results in the formation of ternary aggregates between the polymer and the mixed micelles.

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Section: Self-diffusion Coefficient For Single Surfactantmentioning

confidence: 99%

Investigation of the Interactions of Polyvinylpyrrolidone with Mixtures of Anionic and Nonionic Surfactants or Anionic and Zwitterionic Surfactants by Pulsed Field Gradient NMR

Misselyn-Bauduin

Thibaut

Grandjean

et al. 2001

Journal of Colloid and Interface Science

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“…This may be discussed as follows : 1) increase of radicals concentration in the system, 2) polymer-emulsifier interaction, and 3) reduction of a critical micellar concentration(CMC), degree of counterion binding, and micelle aggregation number (Na). 36 With increasing temperature, the concentrations of radicals and particles increase. Thus, with increasing • AO 80 100 particle number the monomer cores of the microemulsion droplets disappear early in the polymerization and the monomer starved conditions become operative at lower conversion.…”

Section: Polymerization Ratementioning

confidence: 99%

Microemulsion Polymerization of Butyl Acrylate. Effect of Radical Scavenger and Formation of Primary Radicals

Capek

Juraničová

2000

Polym J

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:Microemulsion polymerizations of butyl acrylate initiated by dibenzoyl peroxide in the presence of a radical scavenger (RS)(stable radicals: an oil soluble RS: 4-stearoyloxy-2,2,6,6-tetramethyl piperidine-1-oxyl (STPO) and water soluble RS: 4-hydroxy-2,2,6,6-tetramethyl piperidine-1-oxyl (HTPO)}were investigated. STPO and HTPO decreased the rate of polymerization and the decrease was more pronounced with STPO. Inorganic salts and organic additives decreased the rate of polymerization. The shift of the maximum rate of polymerization to lower conversion by increasing temperature and addition of several additives was attributed to increase of particle number and decrease of monomer concentration at the reaction loci. The decrease of the particle size in the presence of RS is attributed to retardation of particle growth. A close packed structure at the droplet surface promoted by current additives acts as a barrier for entering radicals. The larger overall activation energy in runs with STPO is discussed in terms of a depressed entry ofradicals into microdroplets.KEY WORDS Microemulsion / Butyl Acrylate/ Polymerization/ Tetramethyl Piperidine-1-oxyl Radical Scavenger/ Inorganic Salts/ Rate of Polymerization/ Polymer Particles/ In the case of microemulsion polymerization initiated by the oil-soluble initiator, there are two main approaches for the production of primary radicals : 1 -3 1) in the monomer swollen micelles or polymer particles radicals desorb to the aqueous phase and 2) in the aqueous phase radicals are generated from the fraction of the oilsoluble initiator dissolved in water. -6 A partly watersoluble initiator such as a,a'-azobis(isobutyronitrile) (AIBN) forms primary radicals in both the aqueous phase and in the monomer-swollen micelles. In the case of highly hydrophobic initiator the formation of radicals from the fraction of initiator dissolved in the aqueous phase is negligible, as well as exit of hydrophobic primary radicals into the aqueous phase. Microemulsion and miniemulsion polymerizations initiated by hydrophobic initiators such as dibenzoyl peroxide (DBP) or lauroyl peroxide (LPO) are reported to be relatively fast. 1 · 2 • 7 The very low water solubility of hydrophobic initiator (DBP, LPO, etc.) and radical fragments propose a very low rate of polymerization (ca. by two orders in magnitude lower than that for peroxodisulfate initiated polymerization). The strong cage effect within the microdroplets or latex particles depresses the formation of radicals in the monomer phase. However, the rate of DBP-initiated polymerization was ca. 5 times smaller than the water-soluble peroxodisulfate initiated polymerization (polymerizations carried out under the same reaction conditions). Thus, the polymerization behavior is not properly described by two reaction approaches : 1) water-phase initiation and 2) desorption of primary (monomeric) radicals formed in the microdroplets in the aqueous phase.The non-linearity between the molecular weights of the polystyrene (much below 10 5 ) and laser r...

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“…Quando a associação é entre moléculas forma em solução uma rede "mais rígida" que aumenta com o aumento da concentração de EHEC. Este último fato justifica o aumento da viscosidade em baixas concentrações de SDS; 19,21 (ii) adição de SDS -a interação inicia numa concentração de agregação crítica (cac), comprovada pelas alterações em propriedades já analisadas como diminuição da viscosidade, 1,19,[21][22][23] condutividade elétrica 2,6,19,23 e tensão superficial 9,24,25 . Acima da cac a tendência é dos agregados micelares no complexo estabelecerem-se nas regiões mais hidrofóbicas, com o aumento da concentração de EHEC.…”

Section: 21unclassified

“…[1][2][3][4][5][6][7][8] A associação é vista como sendo um fenômeno induzido pelo polímero e inicia em concentrações menores do que quando na sua ausência e o resultado é a formação de complexos termodinamicamente estáveis, com propriedades físico-químicas diferentes daquelas observadas em soluções micelares. [9][10][11][12][13] Alguns questionamentos são feitos com relação à natureza da estabilidade da interação entre o surfactante e o polímero.…”

Section: Introductionunclassified

“…[1][2][3]15 A interação da EHEC com surfactantes aniônicos como o dodecilsulfato de sódio (SDS) tem sido extensivamente pesquisada e os resultados indicam que é governada por forças intrínsecas entre as cadeias e segmentos, agregação entre as cadeias ou por forças eletrostáticas. 3,13,[16][17][18][19][20] O modelo estrutural dos complexos EHEC-SDS sugerido está fundamentado em medidas de viscosidade e outras propriedades que já foram medidas em função das concentrações do polímero e do SDS em várias temperaturas.…”

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Auto-associação do dodecilsulfato de sódio (SDS) com o polímero hidrofobicamente modificado etil(hidroxietil) celulose (EHEC)

Modolon¹,

Dal-Bó²,

Felippe³

et al. 2009

Quím. Nova

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Recebido em 7/8/08; aceito em 24/4/09; publicado na web em 22/9/09 SELF-ASSOCIATION OF SODIUM DODECYL SULFATE (SDS) WITH THE HYDROPHOBICALLY MODIFIED POLYMER ETHYL (HYDROXYETHYL) CELLULOSE (EHEC). Mixtures of ethyl(hydroxyethyl)cellulose (EHEC)and Sodium Dodecyl Sulfate (SDS) were investigated using surface tension, conductivity and viscosity measurements in aqueous solutions. The parameters of the surfactant to polymer association processes such as the critical aggregation concentration (cac) and saturation of the polymer by SDS (psp) were determined from the plots of surface tension and specific conductivity versus surfactant concentration. Through the final results we see that there was no specific link of polymer with the surfactant, implying therefore a phenomenon of only cooperative association.Keywords: ethyl(hydroxyethyl)cellulose (EHEC); polymer-surfactant interaction; Sodium Dodecyl Sulfate (SDS). INTRODUÇÃONas últimas décadas, a interação entre surfactantes aniônicos e polímeros neutros hidrossolúveis tem sido tema de intensa investigação com finalidade de identificar em solução as propriedades físicas acompanhadas de possíveis mecanismos que interpretem a associação dos surfactantes ao polímero.1-8 A associação é vista como sendo um fenômeno induzido pelo polímero e inicia em concentrações menores do que quando na sua ausência e o resultado é a formação de complexos termodinamicamente estáveis, com propriedades físico-químicas diferentes daquelas observadas em soluções micelares. 9-13Alguns questionamentos são feitos com relação à natureza da estabilidade da interação entre o surfactante e o polímero. A mais "popular" interpretação refere-se ao caráter hidrofóbico, tanto do surfactante como de seções da cadeia polimérica. Sabe-se, no entanto, que somente hidrofobicidade não abrange todos os casos, embora a literatura tenha, recentemente, relatado diferentes modificações estruturais para deixar surfactantes e polímeros com caráter cada vez mais hidrofóbico e, assim, explorar as consequências. 3A partir de um grande número de polímeros não iônicos já investigado, sem dúvida, a celulose hidrofobicamente modificada, etil(hidroxietil) celulose (EHEC), é a mais relevante e estudada. EHEC consiste de uma celulose modificada através da introdução de substituintes hidroxietil e etil às correntes da celulose principalmente para aumentar a solubilidade em água. Assim, EHEC pode ser classificado como um polímero, não iônico, anfifílico e solúvel em água.14 Essas mudanças químicas resultam em alterações significativas nas propriedades dele, além de conferir maior resistência química, resistência a ataques enzimáticos e promoverem efeitos sinergísticos sobre propriedades reológicas das soluções como em formulações de cosméticos e em tintas à base de água. [1][2][3]15 A interação da EHEC com surfactantes aniônicos como o dodecilsulfato de sódio (SDS) tem sido extensivamente pesquisada e os resultados indicam que é governada por forças intrínsecas entre as cadeias e segmentos, agregação entre as cadeias ou por força...

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Ethyl(hydroxyethyl)cellulose-cationic surfactant interactions: electrical conductivity, self-diffusion and time-resolved fluorescence quenching investigations

Cited by 97 publications

References 10 publications

Investigation of the Interactions of Polyvinylpyrrolidone with Mixtures of Anionic and Nonionic Surfactants or Anionic and Zwitterionic Surfactants by Pulsed Field Gradient NMR

Investigation of the Interactions of Polyvinylpyrrolidone with Mixtures of Anionic and Nonionic Surfactants or Anionic and Zwitterionic Surfactants by Pulsed Field Gradient NMR

Microemulsion Polymerization of Butyl Acrylate. Effect of Radical Scavenger and Formation of Primary Radicals

Auto-associação do dodecilsulfato de sódio (SDS) com o polímero hidrofobicamente modificado etil(hidroxietil) celulose (EHEC)

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