아크릴로니트릴공중합체-디메틸포름아마이드 용액의 겔화 거동 및 겔필름의 물성

오영세; 한삼숙; 송기원; Young Se Oh; Sam Sook Han; ki Won Song

Polymer(Korea), Vol.24, No.6, 787-793, November, 2000

Gelation Behavior of Acrylonitrile Copolymer/Dimethylformamide Solution and Mechanical Properties of Films Obtained from It's Solution

오영세^†, 한삼숙, 송기원¹

(주)한일합섬 기술연구소
¹부산대학교 섬유공학과

Young Se Oh^†, Sam Sook Han, and ki Won Song¹

Research and Development Center, Hanil Synthetic Fiber Co. Ltd., Masan 630-791, Korea
¹ki Won Song, Busan National University, Busan 609-749, Korea

E-mail:

초록

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.

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.

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

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