Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지

Study on Model of Emulsion Polymeration 1. Pseudo-homopolymerization

유화중합의 모델연구 1. Pseudo-homopolymerization

  • Park, S.B. (Department of Polymer Engineering, Pukyong National University) ;
  • SE, C.S. (Department of Surface Engineering, Pukyong National University)
  • 박상보 (부경대학교 고분자공학과) ;
  • 서차수 (부경대학교 표면공학과)
  • Received : 1997.12.26
  • Accepted : 1998.02.27
  • Published : 1998.04.10
Download PDF
⟨ Previous Next ⟩

Abstract

To prove pseudo-homopolymerization(PHP) method indirectly for general system which includes more than one growing radicals per particle, Mayo-Lewis equation of bulk copolymer system was derived form probability equation about instantaneous copolymer composition of emulsion copolymer system during interval II. From Extended Smith-Ewart equation proposed by Ballard et al. in emulsion copolymerization, exact solution was obtained for 0-1 system (i.e., the system containing no more than one growing radical per particle). From the exact solution, average number of radicals per particle and instantaneous copolymer composition were predicted to reach the steady state which a few minutes. So the reliability of this approximation method could by proved directly for 0-1 system. Styrene-butadiene(St-Bu) and Styrene-methyl methacrylate (St-MMA) system were used for model calculations.

입자당 한 개 이상의 성장라디칼이 있는 일반계에서 근사적인 psedo-homopolymerization (PHP)방법의 신뢰성을 간접적으로 증명하기 위하여, 벌크중합의 Mayo-Lewis식이 Interval II 동안 유화중합의 순간공중합조성식으로부터 확률적으로 유도됨을 보였다. Ballard등에 의하여 제안된 유화공중합의 확장된 Smith-Ewart식으로부터 0-1계(입자당 1개 이하의 성장라디칼이 있는 계)에 대하여 완전해를 얻었다. 이 해를 사용하여 입자당 평균라디칼수와 순간공중합조성이 몇 분 이내에 정상상태에 도달함을 예측할 수 있었다. 따라서 0-1계에 국한하여 PHP근사방법의 신뢰성을 직접 증명할 수 있었다. 모델계산의 목적으로 Styrene-butadiene(St-Bu)과 Styrene-methyl methacrylate(St-MMA)계를 예로 들었다.

Keywords

References

  1. J. Am. Chem. Soc. v.69 W. D. Harkins
  2. J. Chem. Phys. v.16 W. V. Smith;R. H. Ewart
  3. Emulstion Polymerization G. Lichti;R. G. Gilbet;D. H. Napper;I. Piirma(ed.)
  4. Emulsion Polymerization R. G. Gilbert
  5. J. Polym. Sci. Polym. Chem. Ed. v.19 M. J. Ballard;D. H. Napper;R. G. Gilbert
  6. J. Polym. Sci., Polym. Chem. Ed. v.26 S. A. Chen;K. W. Wu
  7. J. Appl. Polym. Sci. v.26 M. Nomura
  8. Polymer v.9 S. B. Park;B. K. Kim;Y. J. Shin
  9. Polymer v.14 S. B. Park;H. S. Chang;Y. J. Shin
  10. J. Chem. Soc., Faraday trans. Ⅰ. v.82 I. A. Penboss;R. G. Gilbert;D. H. Napper
  11. J. Am. Chem. Soc. v.68 F. D. Mayo;F. M. Lewis
  12. Principles of Polymer Chemistry P. J. Flory