Abstract
Mesomorphic phase behavior and phase diagram of mixtures of ω-lithium sulfonatopolystyrene (PSsul) with trimethylstearylammonium chloride (TMSAC) were investigated with differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS). DSC measurements indicated that the PSsul and the TMSAC formed ionic aggregate with 70 wt % of PSsul and cooperatively crystallized in the aggregate. The SAXS measurements indicated the PSsul−TMSAC aggregate in solid state formed a hierarchical lamellar-within-lamellar structure which had two lamellae with different periodic lengths. Above melting temperature of the aggregate, the shorter period disappeared and the PSsul−TMSAC aggregate formed single lamellar structure. When weight fraction of PSsul was less than 0.7, the PSsul−TMSAC mixtures were phase-separated and had two types of mesomorphic structures attributed to TMSAC itself and the ionic PSsul−TMSAC aggregate. On the other hand, when the weight fraction of PSsul was higher than 0.7, the mesomorphic mo...
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