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 20v/v% acrylic acid and total dose of 4 kGy. Optimum condition of Mohr's salt was 5.0×10^(-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∼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 Å, 3.71 m2/g, 143.3 Å, 4.94 m2/g, 40.97 Å, 8.98 m2/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 5.0×10-3 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∼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 Å, 3.71 m2/g와 143.3 Å, 4.94 m2/g 및 40.97 Å, 8.98 m2/g로 공극의 크기는 감소하고 비표면적이 증가하는 경향을 보였다.

Keywords: radiation-induced polymerization; polypropylene; amination; ultra fine ion-exchange fiber