Polymerization of single-phase microemulsions: Dependence of polymer morphology on microemulsion structure

Raj, Wojciech; Sasthav, Mohan; Cheung, H. Michael

doi:10.1016/0032-3861(95)91212-p

Cited by 34 publications

(34 citation statements)

References 15 publications

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“…Microemulsions are isotropic, optically transparent, and thermodynamically stable dispersion systems consisting of water, oil, and suitable surfactants. Microemulsion polymerization has been widely studied since 1980s, which can be divided into oil‐in‐water (direct), water‐in‐oil (reverse), and water‐in‐oil‐in‐water (double) according to the precursor microemulsions 26–29. Microemulsion polymerization has been widely used to synthesize particles of controlled size and shape, and provide a simple tool to fabricate hydrogel micro/nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of pH‐sensitive crosslinked (NIPA‐co‐AAC) nanohydrogels copolymer

Elsaeed

Farag

Maysour

2011

J of Applied Polymer Sci

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A thermoresponsive polymeric nanohydrogels has been synthesized by inverse microemulsion polymerization of N-isopropylacrylamide (NIPA) and acrylic acid (AAc) using Aerosol (AOT) as a surfactant, ethylene glycol dimethacrylate (EGDMA) as a crosslinker, and 2,2 0 -azobisisobutyronitrile (AIBN) as initiator. The effect of concentration of AIBN, EGDMA, and NIPA/AAc weight ratio was investigated. The lower critical solution temperature (LCST) of poly (NIPA-co-AAC) can be manipulated to be 40 C and 45 C which was correlated to amount of AAc that was copolymerized with NIPA. FTIR, 1H NMR, TEM, and DSC characterized the nanohydrogels.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of pH‐sensitive crosslinked (NIPA‐co‐AAC) nanohydrogels copolymer

Elsaeed

Farag

Maysour

2011

J of Applied Polymer Sci

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“…Previously published contributions (1,16,17) have demonstrated that such changes of conductivity should be assigned to the change of microemulsion type. The overall concentration of electrolyte (i.e., sodium acetate) increases proportionally with X, while the conductivities do not vary directly proportional with X; this proves that the dissociation degree, as well as the mobility, changes.…”

Section: Discussionmentioning

confidence: 95%

“…Conductometric studies (1,3,16,17) are also very useful in order to demonstrate the microemulsion and microstructure character. The increase of the aqueous phase concentration (X) induce a nonlinear modi®cation of the conductivity.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Monomers upon Microemulsions with Short Chain Cosurfactant

Donescu

Fusulan

Vasilescu³

et al. 2001

Journal of Dispersion Science and Technology

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Several monomers (i.e., acrylonitrile (ACN), ethyl acrylate (EtA), acrylate of 2 ethylhexyl (EHA), butyl acrylate (BuA), vinyl acetate (VAc), methyl methacrylate (MMA) and styrene (St)) were investigated in order to study their capacities to form microemulsions. The surfactant was nonyl phenol ethoxylate with 25 moles ethylene oxide and ethanol was used as the cosurfactant. The phase diagrams prove that the capacity for microemulsion formation varies in the following sequence:Conductometric and refractometric studies allowed us to evidence the formation of microemulsions with WaO, bicontinuous or OaW structure. Fluorescence studies give interesting informations on the stabilization capacity of the monomers dispersed by interaction with hydrophobic chain of the cosurfactant. H-NMR studies suggest that the monomers in microemulsions lie in regions with various polarities as function of their chemical nature. In polymerization initiated with benzoyl peroxide the minimum conversions were obtained in zones of composition where the initial microemulsions possess a bicontinuous microstructure. The reactions of degradative transfer of the increasing macroradicals account for these conversion modi®cations. For initiation with ammonium persulphate, its rate of decomposition depends on its ability to displace the proton bonded to the substituted vinylic carbon of the monomer. The productivity of this initiator varies within the sequence MMAThe consumption of the initiator, as induced by the monomer, depends on its chemical nature and on the solubilization site of the microemulsions. 231

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“…[14][15][16][17][18] One of the interesting topics is to study the motion of droplets at the mixture of an ME with a polymer. [19][20][21][22] Usually several Brownian motions can be found in the mixture of an ME with a polymer. [6,9,11] In a previous study, in the mixture of polyethyl glycol(PEG)-PI-PEG triblock polymer with AOT ME, two types of motion were observed; we know that PEG can easily dissolve in water and PI can dissolve in decane.…”

Section: Introductionmentioning

confidence: 99%

Length scale of polyisopirene and dynamic light scattering and structure of sodium-2-diethylhexyl sulfosuccinate/water/decane

Sharifi

Delgosha

2015

Physics and Chemistry of Liquids

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The mixture of polyisopirene (PI) and sodium-2-diethylhexyl sulfosuccinate /decane/ water microemulsion (ME) at AOT to water molar ratio (X = 30) and droplet mass fraction (m f,drop = 0.08) was studied with dynamic light scattering and small-angle Xray scattering (SAXS). The light scattering was used to obtain the diffusion coefficient of Brownian motion of the nano-droplets at different polymer concentrations and molecular weights (1000 and 4700) in the ME. The dynamics of the nano-droplets decreased with the increase of molecular weight (from 1000 to 4700) and concentration (from 0.01 to 0.09) of PI. The study of the structure by SAXS showed that with increase of PI (MW = 1000) mass fraction from 0.01 to 0.09 at ME, the size of the droplets changes from 4.5 to 4.3 nm and with increase of PI (MW = 4700) concentration at ME, the size of droplets changes from 4.8 to 4.4 nm. The size ratio of droplets to polymer decreased with increase of concentration and molecular weight of polymer and also the interaction between the droplets increased with increase of polymer concentration.

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Polymerization of single-phase microemulsions: Dependence of polymer morphology on microemulsion structure

Cited by 34 publications

References 15 publications

Synthesis and characterization of pH‐sensitive crosslinked (NIPA‐co‐AAC) nanohydrogels copolymer

Synthesis and characterization of pH‐sensitive crosslinked (NIPA‐co‐AAC) nanohydrogels copolymer

The Influence of Monomers upon Microemulsions with Short Chain Cosurfactant

Length scale of polyisopirene and dynamic light scattering and structure of sodium-2-diethylhexyl sulfosuccinate/water/decane

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