Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Synthesis of High Affinity Anion Exchanger Using Ultrafine Fibrous PPmb Nonwoven Fabric by Co60 Irradiation Method

방사선 조사에 의한 초극세 폴리프로필렌 섬유부직포를 이용한 고효율 음이온교환체의 합성

  • Choi, Kuk-Jong (Department of Chemical Engineering, College of Engineering, Chungnam National University) ;
  • Lee, Choul-Ho (Department of Chemical Engineering, Kongju National University) ;
  • Hwang, Taek-Sung (Department of Chemical Engineering, College of Engineering, Chungnam National University)
  • Published : 2008.11.30
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Abstract

The aminated polypropylene melt blown ion exchange fibers were synthesized with acrylic acid monomer onto polypropylene melt blown fibers by radiation-induced polymerization and subsequent amination. Degree of grafting was increased with increasing the acrylic acid monomer concentration and total dose. The highest degree of grafting was obtained 140% at a monomer concentration of 20 v/v% acrylic acid and total dose of 4 kGy. Optimum condition of Mohr's salt was 5.0 $\times10^{-3}$ M. Degree of amination was increased with increasing degree of grafting. Water content was about 1.5 times higher than that of trunk polymer. The maximum ion-exchange capacity was 7.3 meq/g which was 2$\sim$3 times higher than a commercial ion exchange fiber. The average pore size was decreased and BET surface area was increased in order of PPmb, PPmb- g- AAc and APPmb- g- AAc. The average pore size and BET surface area of synthesised fibers were $366.1\;{\AA},\;3.71m^2/g,\;143.3\;{\AA},\;4.94m^2/g,\;40.97\;{\AA},\;8.98m^2/g$, respectively.

Acrylic acid 단량체를 방사선 동시조사법으로 폴리프로필렌 멜트 블로운 섬유에 그래프트 반응시켜 PPmb-g-AAc 공중합체를 제조한 후 아민화 반응을 통하여 아민형 이온교환섬유를 합성하였다. 공중합체의 그래프트율은 acrylic acid 단량체의 농도와 총조사선량이 증가할수록 증가하였으며 acrylic acid 단량체의 농도와 총조사선량이 20 v/v%, 4 kGy일 때 140%로 최대치를 나타내었다. Mohr's salt의 최적농도는 $5.0\times10^{-3}$ M로 나타났다. 아민화율은 그래프트율이 증가할수록 증가하여 140%일 때 78.8%로 나타났다. 아민화한 PPmb-g-AAc 공중합체의 함수율은 기재보다 1.5배 정도 높게 나타났으며 이온교환용량은 7.3 meq/g으로 상용 이온교환섬유보다 2$\sim$3배 정도 높게 나타내었다. 합성한 APPmb-g-AAc의 BET 측정결과 PPmb, PPmb-g-AAc 및 APPmb-g-AAc 섬유의 경우 공극의 크기와 비표면적이 각각 $366.1\;{\AA},\;3.71m^2/g$와 $143.3\;{\AA},\;4.94m^2/g$ 및 $40.97\;{\AA},\;8.98m^2/g$로 공극의 크기는 감소하고 비 표면적이 증가하는 경향을 보였다.

Keywords

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