Microgels-Intramolecularly Crossünked Macromolecules with a Globular Structure

Funke, W.; Okay, Oğuz; Joos-Müller, Betina

doi:10.1007/3-540-69682-2_4

Cited by 252 publications

(230 citation statements)

References 276 publications

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“…This typical behavior is due to the increasing extent of the multiple cross-linking reactions with increasing amount of BAAm, leading to the formation of clusters of cross-links. 14 Thus, as the BAAm content in the comonomer feed is increased, more and more BAAm molecules are wasted in elastically ineffective links. On the other hand, the cross-linking efficiency of the nanoparticles rises as their concentration is increased.…”

Section: G′(t) ) G′mentioning

confidence: 99%

Polyacrylamide−Clay Nanocomposite Hydrogels: Rheological and Light Scattering Characterization

2007

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The free-radical polymerization of acrylamide in aqueous clay dispersions and the structure of the resulting polymer-clay nanocomposite hydrogels have been investigated by rheometry using oscillatory deformation tests. Laponite was used as clay particles in the hydrogel preparation. The reactions were carried out with and without the presence of the chemical cross-linker N,N′-methylenebis(acrylamide) (BAAm). In the absence of BAAm, increasing clay concentration from 0.2 to 7% results in 3 orders of magnitude increase of the elastic modulus G′ of the hydrogels. At a clay concentration of 5% or above, all the reaction systems, with or without BAAm, exhibit similar elastic moduli, indicating that clay mainly determines the rubber elasticity of the hydrogels. The loss factor tan δ was found to be around 0.1, indicating that the nanocomposite hydrogels are much more viscous than the conventional hydrogels. Increasing the amount of clay also increases the viscous, energy dissipating properties of the nanocomposite hydrogels, which are responsible for their improved mechanical properties. Dynamics of the nanocomposite hydrogels was also investigated by dynamic light scattering. The ensembleaveraged scattered intensity of the hydrogels varies nonmonotonically with the clay concentration due to the action of clay both as a cross-linker and as an ionic component during the formation of the nanocomposite hydrogels.

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Section: G′(t) ) G′mentioning

confidence: 99%

Polyacrylamide−Clay Nanocomposite Hydrogels: Rheological and Light Scattering Characterization

2007

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“…Microgels are micrometer-scale particles that consist of a crosslinked polymer network swollen by solvent, typically water [1,2]. Microgels can be designed to be sensitive to changes in their environment, for example, to changes in temperature, allowing them to be selectively swollen and deswollen in response to external stimulation [3,4].…”

Section: Introductionmentioning

confidence: 99%

Faster droplet production by delayed surfactant-addition in two-phase microfluidics to form thermo-sensitive microgels

Seiffert

Friess

Lendlein

et al. 2015

Journal of Colloid and Interface Science

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Microfluidic droplet templating produces monodisperse particles of well controllable sizes, but this is limited by the necessity to operate microfluidic devices at low flow rates in the dripping regime. Here, the per-channel rate of droplet production could be substantially increased by delayed surfactant addition as applied and verified for microfluidic production of N-isopropylacrylamide based microgels.

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“…As the time goes on, more and more primary molecules are formed so that the intermolecular crosslinking reactions between the primary molecules may also occur. Funke and coworkers noted the importance of cyclization reactions in free radical crosslinking copolymerization [31]. Apparently cyclization dominates over the intermolecular crosslinking reactions.…”

Section: Morphology Of Crosslinked Polymersmentioning

confidence: 99%

Synthesis and Characterization of Porous Crosslinked Copolymers for Oil Spill Sorption

et al. 2007

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Cinnamoyloxy ethyl methacrylate (CEMA) was copolymerized with different monomer feed ratios of octadecyl acrylate (ODA) and crosslinked using azobisisobutyronitrile (AIBN) as the initiator and N,N',N"-trisacryloyl melanine (AM) or N,N',N",-trismethacryloylmelanine (MM) crosslinkers. The networks are characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). For crosslinked CEMA/ODA copolymer sol fraction values are lower when MM is used rather than AM. The thermal stability of crosslinked network increases with increasing ODA concentration and also in the presence of MM crosslinker, a consequence of higher crosslinking density. SEM results show a porous structure; micropores are formed when ODA contents increases. According to DMA results, the flexibility of the network is enhanced by incorporation of MM rather than AM. Since our crosslinked networks are both flexible and porous, they are applicable as oil sorber networks to alleviate pollution from oil spills.

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Microgels-Intramolecularly Crossünked Macromolecules with a Globular Structure

Cited by 252 publications

References 276 publications

Polyacrylamide−Clay Nanocomposite Hydrogels: Rheological and Light Scattering Characterization

Polyacrylamide−Clay Nanocomposite Hydrogels: Rheological and Light Scattering Characterization

Faster droplet production by delayed surfactant-addition in two-phase microfluidics to form thermo-sensitive microgels

Synthesis and Characterization of Porous Crosslinked Copolymers for Oil Spill Sorption

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