Synthesis of Nylon 6-SBR-Nylon 6 Block Copolymers

나일론 6-SBR-나일론 6 불록 공중합체의 합성

  • Cho Iwhan (Department of Chemical Science, Korea Advanced Institute of Science) ;
  • Lee Kyung-Woo (Department of Chemical Science, Korea Advanced Institute of Science)
  • 조의환 (한국과학기술원 화학 및 화학공학과) ;
  • 이경우 (한국과학기술원 화학 및 화학공학과)
  • Published : 1976.10.30

Abstract

Isocyanate-terminated SBR-prepolymers were prepared from SBR-diol and excess toluene diisocyanate. These prepolymers were then used as initiators for the sodium-catalyzed polymerization of ${\varepsilon}$-caprolactam. The resulting block copolymers, presumably the structure of nylon 6-SBR-nylon 6, were confirmed from their IR spectra. The viscosities of these polymers were measured in phenol/tetrachloroethane and the molecular weights were estimated. The polymerization reaction was not affected by the change in concentration of catalyst, but significantly faster at $185^{\circ}C$ than at $150^{\circ}C$. And the initiator concentration of 0.5 mole % gave good results.

이소시아네이트기를 말단기로 가진 SBR 프리폴리마를 금속 나트륨을 촉매로 사용하여 ${\varepsilon}$-카프로락탐과 함께 음이온 중합시켜 나일론 6-SBR-나일론 6 블록공중합체를 합성하였다. 촉매 농도의 변화는 반응에 큰 영향을 주지 않았으나 개시제인 SBR 프리폴리마의 농도는 0.5몰%일 때 가장 좋은 결과를 얻었다. 반응온도는 $150^{\circ}C$일 때에 비하여 $185^{\circ}C$일 때가 수득률과 분자량의 증가를 보였다. 합성된 중합체의 적외선 스펙트럼에서 $1,730 cm^{-1}$의 우레탄 카르보닐 흡수띠로부터 블록 공중합체임을 확인하였고 프리폴리마와 나일론의 특성 흡수띠에서의 흡광도비로부터 공중합체의 조성을 추정하였다.

Keywords

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