Fire Science and Engineering (한국화재소방학회논문지)

Korean Institute of Fire Science and Engineering (한국화재소방학회)
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Enhanced Flame Resistant Properties of Aluminum Hydroxide Addition on Electrospun Polyurethane Nanofibers

전기방사법에 의해 제조된 폴리우레탄 나노섬유의 수산화알루미늄 내첨에 의한 내염화 특성 향상

  • Received : 2016.09.05
  • Accepted : 2016.10.17
  • Published : 2016.12.31
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Abstract

Anti-oxidation and flame resistant polyurethane nanofibers were prepared by electrospinning and aluminum hydroxide addition. Electrospinning was carried out under the following procedure conditions; applied voltage, 20 kV; polymer solution feeding rate, 1.2 ml/h; collector rolling speed, 120 rpm; and tip to collector distance, 15 cm. Aluminum hydroxide was added to the prepared polymer solution for electrospinning to enhance the oxidation and flame resistant properties. The thermal properties were investigated by thermogravimetric analysis to determine the polymer decomposition temperature, integral procedure decomposition temperature, final decomposition temperature, and remaining amount after thermal decomposition. The activated energy for polymer degradation was also investigated using the Horowitz-Metzger equation. The activation energy increased to more than 50%. The thermal properties of the polyurethane nanofibers were improved by a hydration reaction during the thermal decomposition of aluminum hydroxide around $300{\sim}500^{\circ}C$.

본 논문에서는 내산화성 및 난연성이 향상된 폴리우레탄 나노섬유를 전기방사법 및 수산화알루미늄 내첨을 통해 제조하였다. 전기방사 조건은 인가전압: 20 kV, 폴리머 용액 유량: 1.2 ml/h, 롤러 속도: 120 rpm 및 롤러와 주사기 팁의 거리: 15 cm의 공정변수에서 최적의 조건을 확인하였다. 폴리우레탄 섬유의 내산화성 및 난연성을 향상시키기 위하여, 수산화알루미늄을 전기방사 시 내첨하였다. 제조된 샘플의 열적 특성을 평가하기 위하여 열중량분석기(thermogravimetric analysis, Shimadzu, TGA-50H)를 사용하였다. 또한 관련 분석을 통해 고분자 분해 온도(polymer decomposition temperature), 적분열분해 진행온도(integral procedure decomposition temperature), 최종 분해 온도(final decomposition temperature) 및 열분해 후 잔여량 등을 분석하였다. 그리고 분해 반응의 속도론적 고찰을 위해 Horowitz-Metzger 적분식을 통해 활성화 에너지를 해석하였다. 수산화알루미늄의 내첨에 의해, 분해 활성화 에너지가 50% 이상 증가함을 확인하였다. 이는 수산화알루미늄이 $300{\sim}500^{\circ}C$에서 열분해함에 따라 수화반응에 의해 폴리우레탄 나노섬유의 열분해 저항성이 커지기 때문인 것으로 파악된다.

Keywords

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