Dynamic mechanical properties of PLA and sulfonated polystyrene (SPS) ionomer blends
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초록
내용
In this study, to use PLA (polylactic acid) at high temperatures, PLA was blended with sulfonated polystyrene (SPS) ionomers. To prepare SPS ionomers, 95% of the acid groups of poly(styrene-co-sulfonic acid) copolymer was neutralized with LiOH. The mechanical properties of the blend were investigated as a function of temperature. In the case of PLA, the glass transition temperature (Tg) increased by about 4 degrees when blended with the ionomer. In addition, the storage modulus above Tg of PLA gradually increased as the amount of ionomer increased. Thus, we concluded that PLA and Li ionomers could be partially miscible, to some extent, by the formation of ion- coordination interactions between the Li+ cations of the ionomers and the functional groups of PLA.