Abstract
본 연구에서는 목분 첨가된 폴리프로필렌 복합재의 수분흡수 특성에 목재수종, 화학조성분, 충진제 함량, 입자크기 및 상용화제의 첨가가 미치는 영향에 관해서 알아보았다. 500, 1,000, 1,500, 2,000, 2,500 및 3,000 시간 동안 물에 침지시킨 후, 상수리나무(Quercus accutisima Carr.)와 다릅나무(Maackia amuresis Rupr. et Maxim)는 낙엽송(Larix kaempferi Lamb.)에 비하여 훨씬 낮은 물흡수도를 보였다. 모든 수종에서 목분의 함량이 10 wt%로부터 50 wt%까지 증가할수록, 주어진 시간동안 물에 침지시켰을 때 복합재의 수분흡수율이 증가하 였다. 목분의 입자크기는 복합재의 수분흡수율에 큰 영향을 주는 것으로 나타났다. 상용화제의 첨가는 복합재의 수분흡수율을 낮추는데 아주 효과적이다. 가장 낮은 수분흡수율은 다릅나무 목분을 이용하고, 목분의 함량이 낮을수록, 목분의 입자크기가 작을수록, 그리고 상용화제를 첨가했을 때 얻을 수 있다. 복합재의 두께팽창은 수분흡수율과 아주 높은 상관관계를 가지고 있다. The effects of wood species, chemical components, filler loading level, filler particle size, and coupling agent on the water absorption property of the wood flour filled polypropylene (PP) composites were investigated in this study. After 500, 1,000, 1,500, 2,000, 2,500 and 3,000 hr water immersion, Quercus (Quercus accutisima Carr.) and Maackia (Maackia amuresis Rupr. et Maxim) showed significantly lower water absorption properties compared to Larix (Larix kaempferi Lamb.). As wood flour loading increases from 10 to 50 wt%, most wood species showed increased water absorption after a given immersion period. Particle size of wood flour proved to have very significant effects on water absorption of the composites. The effect of coupling agent was positive in terms of lowering water absorption of the composites. As the treatment level of coupling agent increases, the water absorption of the composites decreases. The lowest water absorption was obtained at the lower wood flour loading (Maackia), smaller particle size and by the addition of coupling agent. Thickness swelling of the composites shows close dependency on water absorption.
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