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用差示扫描量热法（ＤＳＣ）和小角Ｘ射线散射法（ＳＡＸＳ）对经固态缩聚反应后的ＰＢＴ／ＰＥＴ共混体系的结晶熔融行为进行了考察。共混体系的特性粘度随反应时间增加而提高，反应温度高，粘度增加幅度更大。粘度增加均能使ＰＢＴ、ＰＥＴ的熔融峰向高温方向移动，反应温度为２２０℃时，还能观察到ＰＨＴ－ＰＥＴ共聚酯的结晶熔融峰。反应时间增加，晶区厚度变化不大，但长周期和无定形区厚度均略有减小，这可归因于ＰＢＴ／ＰＥＴ共混体系固相缩聚是分子链增长过程，也是晶格完善过程。固态缩聚后分子量增加，体系的熔体冷却结晶温度受熔融温度影响较大。
The crystallization behavior of PBT / PET blends after solid state polycondensation was investigated by differential scanning calorimetry (DSC) and small angle X-ray scattering (SAXS). The intrinsic viscosity of the blend system increases with the reaction time, the reaction temperature is high, the viscosity increase more. The viscosity of PBT and PET melt peak can be moved to high temperature direction, the reaction temperature is 220 ℃, also observed PHT-PET copolyester crystal melting peak. The reaction time increases and the thickness of the crystal grains changes little, but the thickness of the long period and the amorphous area slightly decreases, which can be attributed to the fact that the solid phase polycondensation of PBT / PET blend is the molecular chain growth process, . After the solid state polycondensation molecular weight increases, the system of the melt cooling crystallization temperature greater influence by the melting temperature.