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Fibers and Polymers

, Volume 17, Issue 4, pp 502–511 | Cite as

Preparation of monodisperse poly(vinyl alcohol) (PVA) nanoparticles by dispersion polymerization and heterogeneous surface saponification

  • Young Jae Lee
  • Ga Hyun Lee
  • Jun Seong Hwang
  • Sang Won Jeong
  • Hyun-Chul Kim
  • Eunjoo Kim
  • Tae Hwan Oh
  • Sung Jun LeeEmail author
  • Se Geun Lee
Article

Abstract

Monodisperse poly(vinyl alcohol) (PVA)/poly(vinyl acetate) (PVAc) nanoparticles with a skin-core structure were prepared through heterogeneous surface saponification of PVAc nanoparticles. For the preparation of PVAc nanoparticles with a uniform particle size distribution, vinyl acetate (VAc) was dispersion polymerized in a mixed solvent of ethanol and water using PVA with a low degree of saponification as a stabilizer. Increase of the amount of ethanol in media, the resulting PVAc nanoparticle size increases due to increasing solubility of VAc and oligomer PVAc. To preserve the sphericity and size uniformity of PVAc nanoparticles, we restricted saponification to the surface of the nanoparticles by using a small amount of aqueous sodium hydroxide solution. To determine the proper concentration of alkali solution for heterogeneous saponification, monodisperse PVAc nanoparticles were saponified with different concentrations of alkali solution at 25 °C for 0.5–3.0 h. The PVA/PVAc nanoparticles obtained by the heterogeneous saponification with 4 % (relative to the amount of the VAc) alkali solution for 2.0 h were uniformly shaped and monodispersed with diameter ranging from 428 to 615 nm. Transmission electron microscopy (TEM) confirmed the spherical nature and regular skin-core structure of the PVA/PVAc nanoparticles.

Keywords

Dispersion polymerization Poly(vinyl acetate) (PVAc) nanoparticle Heterogeneous surface saponification Poly(vinyl alcohol) (PVA) nanoparticle Skin-core structure 

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Copyright information

© The Korean Fiber Society and Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Young Jae Lee
    • 1
  • Ga Hyun Lee
    • 1
  • Jun Seong Hwang
    • 1
  • Sang Won Jeong
    • 1
  • Hyun-Chul Kim
    • 1
  • Eunjoo Kim
    • 1
  • Tae Hwan Oh
    • 2
  • Sung Jun Lee
    • 1
    Email author
  • Se Geun Lee
    • 1
  1. 1.Division of Nano and Energy Convergence ResearchDaegu Gyeongbuk Institute of Science and Technology (DGIST)DaeguKorea
  2. 2.Department of Nano, Medical and Polymer MaterialsYeungnam UniversityGyeongsanKorea

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