Novel macromonomer as a reactive stabilizer in the dispersion polymerization of methylmethacrylate

Jung, Hye Jun; Lee, Kang Seok; Shim, Sang Eun; Yang, Sun; Lee, Jung Min; Lee, Hui Je; Choe, Soonja

doi:10.1007/bf03218436

Cited by 13 publications

(9 citation statements)

References 23 publications

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“…[1][2][3][4][5] In many of these applications, there are great needs for the synthetic method having a capability of precise control of their size and narrow size distribution. 5,6 To satisfy the demand of specific properties from versatile applications, the preparation methods have been extensively developed to find efficient production way.…”

Section: Introductionmentioning

confidence: 99%

In situ microfluidic synthesis of monodisperse PEG microspheres

et al. 2009

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This study presents a microfluidic method for the production of monodisperse poly(ethylene glycol) (PEG) microspheres using continuous droplet formation and in situ photopolymerization in microfluidic devices. We investigated the flow patterns for the stable formation of droplets using capillary number and the flow rate of the hexadecane phase. Under the stable region, the resulting microspheres showed narrow size distribution having a coefficient of variation (CV) of below 1.8%. The size of microspheres (45~95 μm) could be easily controlled by changing the interfacial tension between the two immiscible phases and the flow rates of the dispersed or continuous phase.

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Section: Introductionmentioning

confidence: 99%

In situ microfluidic synthesis of monodisperse PEG microspheres

et al. 2009

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“…Steric stabilizers frequently used in dispersion polymerization can be classified into three different types; homopolymers, 8,9 macromonomers, 10 and block 11 or graft copolymers. The most effective steric stabilizers are based on the graft or block copolymers those incorporate a segment soluble to the dispersing solvent, or those adsorbed or anchored on to the dispersed phase.…”

Section: Introductionmentioning

confidence: 99%

Ab initio dispersion polymerization of styrene in the presence of the poly(methacrylic acid) macro-RAFT agent

Lee

et al. 2009

Macromol. Res.

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Stable, spherical, polystyrene particles were synthesized in ab initio dispersion polymerization by using the poly(methacrylic acid)[PMAA] macro-RAFT agent. The presence of the PMAA macro-RAFT agent on the polystyrene (PS) particles was confirmed by NMR and FTIR spectroscopy. The PS particle size was influenced by the concentration of the RAFT agent and monomer due to the initial nucleation. When the concentration of the PMAA macro-RAFT agent was increased from 2 to 10 wt% relative to the monomer, the average particle size decreased from 2.31 to 1.36 μm, the conversion decreased from 93.3 to 88.9%, the weight-average molecular weight increased from 46,300 to 150,200 g mol -1 and the PDI decreased from 2.79 to 1.94, respectively. In particular, the incorporation of 10 wt% of PMAA macro-RAFT agent produced monodisperse PS spheres of 1.36 μm with a coefficient of variation (CV) of 6.44%. Thus, the PMAA macro-RAFT agent worked as a reactive steric stabilizer providing monodisperse, micron-sized, PS particles.

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“…In Figure 4 shear-induced aggregation and agglomeration of titania particles in the medium. [22][23][24][25] Figure 5 denotes the increase in the relative viscosity of non-treated and 5 wt% silane treated titania particles along with a Krieger-Dougherty equation 26 :…”

Section: Resultsmentioning

confidence: 99%

Surface properties of silane-treated titania nanoparticles and their rheological behavior in silicone oil

2005

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The surface of rutile titania nanoparticles was chemically modified by reacting with alkoxy silane. The surface and rheological properties in silicone oil having a wide range of viscosity were investigated. Total surface free energy (γ s ) of the titania particles decreased from 53.12 to 26.94 mJ/m 2 as the silane used for surface treatment was increased from 0 to 5.0 wt%. The surface free energy of neat silane was 25.5 mJ/m 2 , which is quite close to that of titania particles treated with 5.0 wt% silane. Due to the hydrophobic nature of treated-titania, the contact angle was accordingly higher for polar solvent in the order of waterethylene glycolformamide α-bromonaphthalene. In sum of rheological behavior, as the applied shear stress or viscosity of the silicone oil increased, the titania particles tend to form layers and agglomerated clusters, showing shear-thinning and shear-thickening behaviors, sequentially. A good dispersion of discrete titania particles obeying a Newtonian flow behavior was achieved at a surface energy or low concentration of silane-treated titania particles in hydrophobic silicone oil.

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Novel macromonomer as a reactive stabilizer in the dispersion polymerization of methylmethacrylate

Cited by 13 publications

References 23 publications

In situ microfluidic synthesis of monodisperse PEG microspheres

In situ microfluidic synthesis of monodisperse PEG microspheres

Ab initio dispersion polymerization of styrene in the presence of the poly(methacrylic acid) macro-RAFT agent

Surface properties of silane-treated titania nanoparticles and their rheological behavior in silicone oil

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