• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2003 Fiscal Year Final Research Report Summary

Development of Highly Precise Controlling Methods for Polymer Microspher by Taking Advantage of Nonlinear Dynamics

Research Project

Project/Area Number 13555207
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 化学工学一般
Research InstitutionKobe University

Principal Investigator

OHMURA Naoto  Kobe University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50223954)

Co-Investigator(Kenkyū-buntansha) KATAOKA Kunio  Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (20031081)
Project Period (FY) 2001 – 2003
KeywordsContinuous emulsion polymerization / Nonlinear dynamics / Dynamic process / Bifurcation Phenomena / Self-sustained oscillation / Periodic operation / Unsteadiness / Particle aggregation
Research Abstract

This research attempted to take advantage of the nonlinear dynamics in continuous emulsion polymerization processes in order to control latex particle size distribution. When the emulsion polymerization of vinyl acetate was conducted in a CSTR under conditions below the critical micelle concentration of the emulsifier, the monomer conversion attained in a time-independent steady-state operation showed a drastic rise from 0 to over 60% at a critical reaction temperature or mean residence time. The mean residence time or the reaction temperature was switched alternately between two values in the non-steady-state operation, one giving zero monomer conversion and the other a high monomer conversion in the usual steady-state operation. The periodic-switching operation induced oscillations in monomer conversion in time. The particle size distribution varied synchronously with the switching operation. This research showed the possibility of controlling the particle size distribution by adjust … More ing the frequency and/or the amplitude of the temporal variation of the mean residence time or reaction temperature. This research found that even while the constant monomer conversion was maintained at the steady state, the particle size distribution oscillated with a very large time period. This research revealed that the oscillations occur by a competitive interaction between polymerization reaction and aggregation of latex particles. In order to vary the colloidal stability of latex particles, a nonionic surfactant was added in some cases. It was found that using a mixture of a nonionic surfactant and an anionic surfactant was very effective for suppressing the oscillations. In order to take advantage of the oscillations of particle size, emulsion polymerization of vinyl acetate was performed in a system of two continuous stirred tank reactors in series. The oscillatory behavior could be controlled by varying the rotational speed of the impeller and the mean residence time. The research using two CSTR in series indicated the possibility of producing various poly-dispersed latex particles. Less

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] N.Ohmura: "Novel Operating Method for Controlling Latex Particles Size Distribution in Emulsion Polymerization of Vinyl Acetate"Industrial & Engineering Chemistry Research. 40-23. 5177-5183 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ohmura: "Self-Sustained Oscillation of PSD of Latex Particles in Continuous Emulsion Polymerization"Proc.9th APCChE Congress and CHEMECA 2002. (CD-ROM). 1-8 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kataoka: "Self-Sustained Oscillation of Particle Size Distribution in Continuous Emulsion Polymerization"Proc.15^<th> International Congress of Chemical and Process Engineering. (CD-ROM). 1-5 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kataoka: "Effect of Nonlinear Coupling between Transport and Reaction Dynamics in Polymerization Processes"Proc.13th International Symposium on Transport Phenomena. 491-496 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 片岡邦夫: "回分および連続操作による酢酸ビニルの乳化重合のダイナミックス"化学工学論文集. 29-3. 363-367 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大村直人: "反応温度の周期操作を用いた酢酸ビニルの連続乳化重合"化学工学論文集. 29-3. 378-381 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ohmura: "Effect of Aggregation of Polymer Particles on Particle Size Distribution in Cnotinuous Emulsion Polymerization of Vinyl Acetate"Proc.6th Italian Conference on Chemical and Process Engineering. 3. 1319-1324 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ohmura: "Effect of the Emulsifier on the Dynamic Behavior of Particle Size Distribution in Continuous Emulsion Polymerization of Vinyl Acetate"Journal of Chemical Engineering of Japan. 37-3. 461-464 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ohmura: "Emulsion Polymerization of Vinyl Acetate in a System of Two CSTR in Series"Proc.10th APCChE Congress. (CD-ROM). 1-8 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Naoto Ohmura: "Novel Operating Method for Controlling Latex Particles Size Distribution in Emulsion Polymerization of Vinyl Acetate"Industrial & Engineering Chemistry Research. 40-23. 177-5183 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoto Ohmura: "Self-Sustained Oscillation of PSD of Latex Particles in Continuous Emulsion Polymerization"Proc.9th APCChE Congress and CHEMECA 2002. (CD-ROM). 1-8 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kunio Kataoka: "Self-Sustained Oscillation of Particle Size Distribution in Continuous Emulsion Polymerization"Proc.15^<th> International Congress of Chemical and Process Engineering. (CD-ROM). 1-5 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kunio Kataoka: "Effect of Nonlinear Coupling between Transport and Reaction Dynamics in Polymerization Processes"Proc.13th International Symposium on Transport Phenomena. 491-496 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kunio Kataoka: "Dynamics of emulsion Polymerization of Vinyl Acetate by Batch and Continuous Flow Operations"Kagaku Kougaku Ronbunshu. 29-3. 363-367 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoto Ohmura: "Continuous Emulsion Polymerization of Vinyl Acetate with Periodic Alternation of Reaction Temperature"Kagaku Kougaku Ronbunshu. 29-3. 378-381 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoto Ohmura: "Effect of Aggregation of Polymer Particles on Particle Size Distribution in Continuous Emulsion Polymerization of Vinyl Acetate"Proc.6th Italian Conference on Chemical and Process Engineering. 3. 1319-1324 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoto Ohmura: "Effect of the Emulsifier on the Dynamic Behavior of Particle Size Distribution in Continuous Emulsion Polymerization of Vinyl Acetate"Journal of Chemical Engineering of Japan. 37-3. 461-464 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoto Ohmura: "Emulsion Polymerization of Vinyl Acetate in a System of Two CSTR in Series"Proc.10th APCChE Congress. (CD-ROM). 1-8 (2004)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2005-04-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi