OBJECTIVE To prepare solid dispersion(SD) of dipfluzine(DF) with PEG 6000 and investigate the thermodynamics of SD in aqueous solution.METHODS Dipfluzine SDs were prepared by solid co-grinding method under a solvent-free condition.The properties of SDs and physical mixtures were characterized by Fourier-transform infrared(FTIR),X-ray diffraction(XRD),and differential scanning calorimetry(DSC).The effects of grinding time and DF/PEG ratios on physiochemical properties of SDs were investigated.The solubility ...