폴리에틸렌테레프탈레이트 고리 올리고머의 조절

조준식; 육지호; 류동일; 고석원; 하완식

Polymer(Korea), Vol.22, No.4, 519-527, July, 1998

Export Citation

폴리에틸렌테레프탈레이트 고리 올리고머의 조절

Control of Cyclic Oligomer in Poly(ethylene terephthalate)

조준식, 육지호, 류동일, 고석원, 하완식

초록

폴리에틸렌테레프탈레이트(PET) 고리 올리고머 중 특히 공정상 문제를 일으키는 고리 삼량체의 함량을 줄이기 위하여 두 가지 방법을 도입하였다. 첫번째 방법으로서, PET 고리 올리고머의 주생성 기구로 알려진 말단 수산기에서의 해중합을 막기 위하여 축합형 사슬 연장제인 diphenyl terephthalate(DPT)를 0.5 mole% 넣고 PET를 중합하여 말단 히드록시기를 봉쇄하였다. DPT를 넣지 않고 중합한 PET보다 DPT를 넣고 중합한 PET의 경우가 더 높은 분자량을 얻었으며 고리 삼량체의 함량은 16%까지 줄었다. 두번째 방법으로서, PET의 화학적 구조에 따른 고리 삼량체의 우세한 생성을 억제하기 위하여 다양한 이종의 단량체를 공중합으로 도입하여 PET 사슬의 입체배열 (configuration)을 변화시켰다. 그 결과 모든 PET 공중합체의 PET 고리 삼량체는 감소하였으며 특히 poly(ethylene 2,6-naphthalate-co-terephthalate)(PET/EN)의 경우 11 mole%의 나프탈레이트 단위의 도입으로 PET 고리 삼량체의 함량을 69%까지 줄일 수 있었다.

In order to reduce the cyclic oligomeric components of poly(ethylene terephthalate) (PET), especially cyclic trimer, two methods were investigated. Firstly, bis(2-hydroxyethyl) terephthalate(BHET) was polycondensated with a such as chain extender such as a diphenyl terephthalate (DPT). PET polymerized with 0.5 mole% of DPT showed a higher molecular weight and a cyclic trimer with lower content than PET synthesized without DPT, by 16% in weight. Secondly, some comonomeric units were introduced into polymerization of PET. All of PET copolyesters showed the reduced content of cyclic trimer. For poly(ethylene 2,6-naphthalate-co-terephthalate) (PET/EN), the content of cyclic trimer was reduced unto 69% by the introduction of 11% of naphthalene unit into PET.

Keywords:Poly(ethylene terephthalate) (PET);Cyclic oligomer;Diphenyl terephthalate (DPT);Copolyester

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[31] Jacobson H, Stockmayer WH, J. Chem. Phys., 18, 1600 (1950)