탄소섬유를 이용한 PE pipe의 전기융착과 Nano TiO2가 에폭시의 열적 특성에 미치는 영향에 관한 연구

Abstract

What makes change to curing mechanism was experimented when nano TiO2 was dispersed into epoxy(Bisphenol A, YD-128) with different curing agents. There are two different models in nano composites. One is attractive model, which has chemical attraction between nano particles and matrix. This model decreases the mobility of composites because distance between each polymer become shorter. Properties of attractive model are high modulus and tensile strengths, high Tg due to high cross-linked density. The other model is repulsive model, which hasn't chemical attraction between nano particles and matrix. So its distance between each polymer is long, their mobility increases. That's why Tg was reduced and also tensile strengths, modulus were decreased. Nano TiO2(P90, AEROXIDE) was dispersed into epoxy, and was mixed with Jeffamine(D-180), at room temperature for its curing condition. The exothermic temperature and Tg was reduced, and as increasing amounts of TiO2. Also, properties of tensile strengths and strains were increased as increasing amounts of TiO2 until 3 wt.%. Because it was dispersion strengthening effect caused nano particles. However, there properties were decreased at 5 wt.% of TiO2, because TiO2 was agglomerated in epoxy. Same amounts of TiO2 was dispersed into epoxy, and was mixed with NMA and BDMA, hardener, at high temperature for its curing condition. The exothermic temperature and Tg rises as increasing amounts of TiO2. Also, tensile strengths and strains were decreased as increasing amounts of TiO2. But their values are higher than pure epoxy except 5wt.% of TiO2. The results of curing epoxy using two different curing agents, epoxy/TiO₂ nanocomposites using Jeffamine were estimated repulsive model. On the other hand, epoxy/TiO2 nanocomposites using NMA were considered for attractive model. The chemical interaction of nanocomposites will be researched continuously more detail.