선택적 용해와 수소 핵자기공명분광법을 이용한 EVA/LDPE 블렌드의 조성 분석법

초록

In this study, a compositional analysis method was developed that can determine the mixing ratio of poly(ethylene-co-vinyl acetate) (EVA)/low density polyethylene (LDPE) blend using the selective dissolution properties of cyclohexane solvent and also determine the vinyl acetate (VA) content of dissolved EVA using ¹H NMR spectroscopy. As a result of applying this analysis method to EVA/LDPE mixture and blend samples prepared in various ratios, the weight ratio of the separated soluble and insoluble parts was obtained at the level of 97-109% of the EVA and LDPE mixing ratio. Compared to the VA content of EVA used for formulation, the VA content of soluble part was calculated with an average difference of 0.6 and 1.9 wt% in the mixture and blend samples, respectively. These results confirmed that the method of applying the selective dissolution and 1H NMR spectroscopy together is suitable for the composition analysis of the EVA/LDPE blend.

키워드