scholarly journals Preparation of Monodisperse Poly(Methyl Methacrylate)/Polystyrene Composite Particles by Seeded Emulsion Polymerization Using a Sequential Flow Process

2021 ◽  
Vol 3 ◽  
Author(s):  
Takaichi Watanabe ◽  
Kengo Karita ◽  
Midori Manabe ◽  
Tsutomu Ono
Keyword(s):  
Methyl Methacrylate ◽  
Emulsion Polymerization ◽  
Aqueous Phase ◽  
Slug Flow ◽  
Particle Diameter ◽  
Monomer Conversion ◽  
Composite Particles ◽  
Seeded Emulsion Polymerization ◽  
Flow Process ◽  
Seed Particles

We develop a sequential flow process for the production of monodisperse poly (methyl methacrylate) (PMMA)/polystyrene (PS) composite particles through a soap-free emulsion polymerization of methyl methacrylate (MMA) using the first water-in-oil (W/O) slug flow and a subsequent seeded emulsion polymerization of styrene (St) using the second W/O slug flow. In this process, monodisperse PMMA seed particles are first formed in the dispersed aqueous phase of the first W/O slug flow. Subsequently, removal of the oil phase from the slug flow is achieved through a porous hydrophobic tubing, resulting in a single flow of the aqueous phase containing the seed particles. The aqueous phase is then mixed with an oil phase containing St monomer to form the second W/O slug flow. Finally, monodisperse PMMA/PS composite particles are obtained by a seeded emulsion polymerization of St using the second W/O slug flow. We compared the reaction performance between the slug flow and the batch processes in terms of particle diameter, monomer conversion, particle size distribution, and the number of particles in the system. We found that internal circulation flow within the slugs can enhance mass transfer efficiency between them during polymerization, which results in monodisperse PMMA/PS composite particles with a large particle diameter and a high monomer conversion in a short reaction time, compared to those prepared using the batch process. We believe that this sequential microflow process can be a versatile strategy to continuously produce monodisperse composite particles or core-shell particles in a short reaction time.

Synthesis of SiOH-functionalized composite particles with buckled surface by seeded emulsion polymerization

2017 ◽  
Vol 295 (3) ◽  
pp. 471-478 ◽  
Author(s):  
Likui Wang ◽  
Hongping Li ◽  
Gang Shi ◽  
Jianquan Hong ◽  
Zerui Chen ◽  
...  
Keyword(s):  
Emulsion Polymerization ◽  
Composite Particles ◽  
Seeded Emulsion Polymerization

scholarly journals Well Defined Poly(Methyl Methacrylate)-Fe3O4/Poly(Vinyl Pivalate) Core–Shell Superparamagnetic Nanoparticles: Design and Evaluation of In Vitro Cytotoxicity Activity Against Cancer Cells

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2868
Author(s):  
Graciane Resende ◽  
Gabriel V. S. Dutra ◽  
Maria S. B. Neta ◽  
Olacir A. Araújo ◽  
Sacha B. Chaves ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Emulsion Polymerization ◽  
Cell Lines ◽  
Shell Structure ◽  
In Vitro Cytotoxicity ◽  
Core Shell ◽  
Seeded Emulsion Polymerization ◽  
Poly Methyl Methacrylate ◽  
The Core

The objective of this work is to develop and characterize polymeric nanoparticles with core–shell morphology through miniemulsion polymerization combined with seeded emulsion polymerization, aiming at the application in the treatment of vascular tumors via intravascular embolization. The synthesis of the core–shell nanocomposites was divided into two main steps: (i) Formation of the core structure, consisting of poly(methyl methacrylate)/magnetic oxide coated with oleic acid (OM-OA) via miniemulsion and (ii) shell structure produced through seeded emulsion polymerization of vinyl pivalate. Nanocomposites containing about 8 wt.% of OM-OA showed high colloidal stability, mean diameter of 216.8 nm, spherical morphology, saturation magnetization (Ms) of 4.65 emu·g−1 (57.41 emu·g−1 of Fe3O4), preserved superparamagnetic behavior and glass transition temperature (Tg) of 111.8 °C. TEM micrographs confirmed the obtaining of uniformly dispersed magnetic nanoparticles in the PMMA and that the core–shell structure was obtained by seeded emulsion with Ms of 1.35 emu·g−1 (56.25 emu·g−1 of Fe3O4) and Tg of 114.7 °C. In vitro cytotoxicity assays against murine tumor of melanoma (B16F10) and human Keratinocytes (HaCaT) cell lines were carried out showing that the core–shell magnetic polymeric materials (a core, consisting of poly(methyl methacrylate)/Fe3O4 and, a shell, formed by poly(vinyl pivalate)) presented high cell viabilities for both murine melanoma tumor cell lines, B16F10, and human keratinocyte cells, HaCaT.

Synthesis and Properties of Nano-TiO2 Modified Fluorine-Containing Polyacrylate Soap-Free Emulsion

2014 ◽  
Vol 809-810 ◽  
pp. 161-168 ◽  
Author(s):  
Jian Hua Zhou ◽  
Lin Ben Wang ◽  
Yan Jiao Cui ◽  
Jian Zhong Ma ◽  
Gen Xing Sun
Keyword(s):  
Methyl Methacrylate ◽  
Emulsion Polymerization ◽  
Cotton Fabric ◽  
Ir Spectrum ◽  
Butyl Acrylate ◽  
Monomer Conversion ◽  
Uv Blocking ◽  
Soap Free Emulsion Polymerization

Nano-TiO2Modified Fluorine-Containing Polyacrylate Soap-Free Emulsion was Successfully Synthesized via Soap-Free Emulsion Polymerization Technique, in which the Polymerization Monomers Consisted of Methyl Methacrylate (MMA), Butyl Acrylate (BA) and Dodecafluoroheptyl Methacrylate (DFMA). the Influence of Amount of Initiator, Emulsifier, Containing Fluorine Monomer and nano-TiO2on the Performance of Emulsion was Investigated. the Results Showed that the Good Polymerization Stability, and High Monomer Conversion were Obtained when the Amount of Ammonium Initiator was 1.2%, the Amount of Reactive Emulsifier was 3.5%. with Increasing Amount of DFMA, the Monomer Conversion Decreased and the Gel Rate Increased Gradually with the Increase of DFMA Amount. UV-Blocking Ability of the Cotton Fabric Treated with the Hybrid Emulsion Containing Nano-Tio2increased with Increasing Amount of Nano-TiO2. IR Spectrum Results Showed that Nano-TiO2and Fluorine-Containing Monomer were Successfully Introduced in the Segmental Structure of the Polymer. SEM Revealed that Nano-TiO2was Loaded on the Surface of the Treated Cotton Fabric which had Good Hydrophobicity.

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