• Gelation Behavior of Acrylonitrile Copolymer/Dimethylformamide Solution and Mechanical Properties of Films Obtained from It's Solution
  • Oh YS, Han SS, Song KW
  • 아크릴로니트릴공중합체-디메틸포름아마이드 용액의 겔화 거동 및 겔필름의 물성
  • 오영세, 한삼숙, 송기원
Abstract
The acrylonitrile copolymer/dimethylformamide(DMF) solutions were prepared to investigate the gelation behavior and critical gel concentration(c*). Gelation is rapidly progressed with the increase of molecular weight of copolymer, but significantly delayed with supercooling temperature and comonomer contents. The c* behavior showed contrary trend against gelation behavior. In dynamic viscoelastic test, two glass-transition region were observed in film obtained from gelled solution whereas one glass-transition in film obtained from true solution. This result supports the idea that an ordered junction zone is formed by the dipole-dipole interaction of intermolecularly neighboring stereo-regular parts of atactic acrylonitrile copolymer chains due to a nucleation process in the solution.

분자량과 methylacrylate 함량이 다른 아크릴로니트릴 공중합체의 dimethylformamide(DMF) 농후용액의 겔화 거동 및 임계 겔농도(c*)를 조사하였다. 중합체 종류에 관계없이 저온에서 장시간 방치할 경우 방치시간에 따라 점도가 급격히 증가하여 겔화가 진행됨을 알았으며, 중합체의 분자량이 클수록, 방치온도가 낮을수록 그리고 공중합체 중 아크릴로니트릴 성분비가 증가할수록 겔화 진행속도가 증가하였고, 임계 겔농도는 감소하였다. 동적 점탄성 실험에서 겔 용액으로부터 얻은 필름은 진 용액으로부터 얻은 필름과 달리 두 개의 유리전이 영역을 나타내었다. 이러한 결과는 겔화과정에서 atactic 중합체중 입체 규칙적인 block들간의 쌍극자-쌍극자 상효작용에 의한 ordered-junction zone의 존재를 강하게 시사하였다.

Keywords: acrylonitrile copolymer; dimethylformamide; gelation; critical gel concentration; ordered junction zone; dipole-dipole interaction

References
  • 1. Rogovina LZ, Slonimskii GL, Russian Chem. Rev., 43, 503 (1974)
  •  
  • 2. Rehage G, Kolloid Z., 196, 97 (1964)
  •  
  • 3. Silbergerg A, Macromolecules, 13, 742 (1980)
  •  
  • 4. Silberberg A, Hennenberg M, Nature, 312, 746 (1984)
  •  
  • 5. Domszy RC, Alamo R, Edwards CO, Mandelkern L, Macromolecules, 19, 310 (1986)
  •  
  • 6. Beckmann J, Zenke D, Colloid Polym. Sci., 271, 436 (1993)
  •  
  • 7. Koltisko B, Keller A, Litt M, Baer E, Hiltner A, Macromolecules, 19, 1207 (1986)
  •  
  • 8. Coniglio A, Stanley HE, Klein W, Phys. Rev. Lett., 42, 518 (1979)
  •  
  • 9. Tan HM, Moet A, Hiltner A, Macromolecules, 16, 28 (1983)
  •  
  • 10. Labudzinska A, Ziabicki A, Kolloid Z., 243, 21 (1971)
  •  
  • 11. Bisschops J, J. Polym. Sci., 17, 89 (1955)
  •  
  • 12. Flodin PJ, Macromol. Chem. Macromol. Symp., 22, 253 (1988)
  •  
  • 13. Tanaka F, Macromolecules, 22, 1988 (1989)
  •  
  • 14. Tanaka F, Matsuyama A, Phys. Rev. Lett., 62, 2759 (1989)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 2000; 24(6): 787-793

    Published online Nov 25, 2000