采用籽晶法制备了大体积高质量的4-(4-二甲基氨基苯乙烯基)甲基吡啶对甲基苯磺酸盐(DAST)晶体,对制备条件进行了优化,对DAST晶体X射线衍射谱图中的主要峰进行了指标化.另外,还对所制备的DAST晶体的透光性、热稳定性进行了研究,并对265℃的焙烧产物进行了X射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)测试,证明了260℃是DAST晶体的熔化相变温度,说明采用熔融法制备DAST晶体是可行的;同时还对DAST晶体的热失重过程进行了初步探讨. A large volume of high quality 4- (4-dimethylaminostyryl) picoline p-toluenesulfonate (DAST) was prepared by the seed method. The preparation conditions were optimized. The DAST crystal X The main peaks in the X-ray diffraction spectrum were also normalized. The transmissivity and thermal stability of the prepared DAST crystals were also studied. The calcination products at 265 ℃ were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) test, it is proved that 260 ℃ is the melting transition temperature of DAST crystal, which shows that it is feasible to use melt method to prepare DAST crystal. At the same time, the thermogravimetry of DAST crystal is also discussed. .