Monosized polymer particles in size-exclusion chromatography

Kulin, Lars‐Inge; Flodin, Per; Ellingsen, T.; Ugelstad, J.

doi:10.1016/s0021-9673(01)89370-5

Cited by 52 publications

(13 citation statements)

References 11 publications

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“…Monodisperse polymer particles having a macroporous structure have been one of the most efficient materials for many separation processes [48][49][50]. Therefore, there have been many researches to control the porosity of the porous polymer particles.…”

Section: Porous Particlesmentioning

confidence: 99%

Monodisperse polymer particles synthesized by seeded polymerization techniques

Kim

Suh

2008

Journal of Industrial and Engineering Chemistry

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Section: Porous Particlesmentioning

confidence: 99%

Monodisperse polymer particles synthesized by seeded polymerization techniques

Kim

Suh

2008

Journal of Industrial and Engineering Chemistry

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“…Therefore, with M/P ratios higher than tried here, it is expected that the seed particles will still grow, but the majority of the particles will be produced by new nucleation thereby creating a main population at a size of around 2.65 lm. A number of reaction conditions vary with increasing M/P ratio and constant final solids: (1) increasing monomer concentration in the medium; (2) increasing solvency of the medium for the produced polymer; and (3) reduced number concentration, surface area, and volume of the seed particles. Table II and Figure 5 show the relationship between the M/P ratio and the initial seed number concentration and surface area (unswollen) for the reactions of Figure 3.…”

Section: Effect Of Initiator Concentrationmentioning

confidence: 99%

Seeding as a means of controlling particle size in dispersion polymerization

Sheng

Sudol

Dimonie

et al. 2008

J of Applied Polymer Sci

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Two distinctively different seeded dispersion polymerization processes employing micron and submicron size seed particles, respectively, have been used to gain a better mechanistic understanding of the dispersion polymerization process. Using monodisperse micron-size PMMA particles as seed, it was found that when low monomer/polymer ratios (M/P < 2.50) were used in methyl methacrylate (MMA) seeded dispersion polymerizations, particle growth dominates and the number of particles remains unchanged (i.e., narrow distributions are preserved). However, when higher M/P ratios (>2.50) were applied, bimodal or trimodal particle size distributions were produced, which is considered to result from the competition between particle growth and secondary nucleation. When small amounts of submicron seeds were used with the initial intention of gaining a better understanding of the nucleation process, it was surprisingly found that the final number of micron size particles was nearly the same as the initial number of submicron seed particles over a relatively wide range of reaction conditions, including seed, initiator, stabilizer, and monomer concentrations, and the medium composition. These results indicate that within certain limits seeded dispersion polymerization can be a more robust means of controlling particle size than ab initio dispersion polymerization in terms of reproducibly producing a target particle size.

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“…Typical methods developed in the past for producing highly monodisperse, micrometer-sized polymer particles include nonaqueous dispersion polymerization [5][6][7][8], seeded polymerizations with multistage monomer swelling [9,10], activated monomer swelling [11][12][13][14] or dynamic swelling [15,16], and others [17,18]. Although those methods are successful, an apparent drawback of the methods is the use of surfactant or stabilizer, which brings about impurity in the resultant particles.…”

Section: Introductionmentioning

confidence: 99%