Article
  • Synthesis and Monomer Reactivity Ratio of PNIPAAM-PMMA Random Copolymer
  • Lee CB, Cho CG
  • PNIPAAM-PMMA Random Copolymer의 합성 및 단량체 반응성비 측정
  • 이창배, 조창기
Abstract
Radical copolymerization of N-isopropylactylamide(NIPAAM) with methylmethacrylate(MMA) was carried out in 1,4-dioxane using 2,2''-azobisisobutyronitrile (AIBN). To investigate the reactivity ratios of NIPAAM and MMA at different reaction temperatures, the copolymerization was allowed to proceed to low conversion(less than 10wt%), and the reaction temperatures were 50, 60, and 70℃. The monomer reactivity ratios of NIPAAM and MMA were estimated by the graphical methods according to the Finemann-Ross equation. The γ1 and γ2 values for NIPAAM-MMA were 0.259 and 2.782 at 50 ℃, 0.271 and 2.819 at 60℃, and 0.286 and 2.915 at 70℃, respectively. As the reaction temperature increased, the γ1 and γ2 values increased. THe activation energy difference was estimated by comparing the reactivity ratios at different reaction temperatures.

자유 라디칼 개시제인 2,2''-azobisisobutyronitrile(AIBN)을 사용하여 1,4-dioxane용매하에서 N-isopropylacrylamide(NIPAAM)와 methyl methacrylate(MMA)를 공중합하였다. 온도에 따른 NIPAAM과 MMA의 반응성비를 알아보기 위해 각각 50, 60, 70°C에서 중합하여 전환율이 10wt%이하가 되도록 반응을 정지시켰다. 단량체 반응성빈는 Finemann-Ross법으로 구하였으며, 그 값은 50°C에서는 γ1=0.259, γ2=2,782, 60°C에서는 γ1=0.271, γ2=2.819, 그리고 70℃에서는 γ1=0.286, γ2=2.915로 나타나, 반응온도가 높아질수록 γ1, γ2값이 증가함을 알 수 있었다. 또한 반응온도와 반응성비와의 관계에서 활성화에너지의 차를 구할 수 있었으며, 그 결과 반응성비는 온도 의존성이 있는 것으로 나타났다.

Keywords: reactivity ratio; radical copolymerization; N-isopropylacrylamide; methyl methacrylate; activation energy

References
  • 1. Heskins M, Guillet JE, J. Macromol. Sci.-Chem., A2, 1441 (1968)
  •  
  • 2. Fujishige S, Kubota K, Ando I, J. Phys. Chem., 93, 3311 (1989)
  •  
  • 3. Mumick PS, Mccormick CL, Polym. Eng. Sci., 34(18), 1419 (1994)
  •  
  • 4. Chen G, Hoffman AS, Macromol. Chem. Phys., 196, 1251 (1995)
  •  
  • 5. Yang HJ, Cole CA, Monji N, J. Polym. Sci. A-Polym. Chem., 28, 219 (1990)
  •  
  • 6. Priest JH, Murray SA, Nelson RJ, Polym. Prepr.(Am. Chem. Soc. Div. Polym. Chem.), 27(1), 239 (1986)
  •  
  • 7. Chiklis CK, Grasshoff JM, J. Polym. Sci. A-Polym. Chem., 8(A-2), 1617 (1970)
  •  
  • 8. Wilhelm M, Zhao CL, Wang Y, Xu R, Winnik MA, Mura JL, Riess G, Croucher MD, Macromolecules, 24, 1033 (1991)
  •  
  • 9. Gupta PK, J. Pharm. Sci., 79, 949 (1990)
  •  
  • 10. Malmsten M, Lindman B, Macromolecules, 25, 5440 (1992)
  •  
  • 11. Kataoka K, Kwon GS, Yokoyama M, Okano T, Sakurai Y, J. Control. Release, 24, 119 (1993)
  •  
  • 12. Finemann N, Ross SD, J. Polym. Sci., 5, 259 (1950)
  •  
  • 13. Kelen T, Tudos F, J. Macromol. Sci.-Chem., A9, 1 (1975)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2000; 24(2): 168-173

    Published online Mar 25, 2000