In this study, twin-screw extruder (TSE) was used to manufacture recycled poly (ethylene terephthalate) (PET)/poly (butylene terephthalate) (PBT) blends in various ratios. Joncryl ADR 4468 ® was also used as chain extender in blend developments while different mixing strategies were applied. In the first strategy, PBT, recycled PET, and Joncryl were extruded all together. In the second strategy, recycled PET was firstly extended with Joncryl and then blended with PBT at certain ratios (premixing method). Melt flow properties (MFI), phase miscibility in the blends, thermal and crystallization behaviors, and eventually tensile and impact properties of the blends were investigated. Increasing amount of chain extender decreased melt flow rate in MFI analysis. Thermal properties and crystallization behavior of the blends were investigated by using dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). In thermal analysis, crystal nucleation effect of chain extender was observed in branched r-PET. All blends either with chain extender or not showed single glass transition temperature during first and second heating cycled in DSC, which could be attributed to miscibility at amorphous state. However, separate crystal melting temperatures in first heating cycle turned into a single peak with some shoulders in second heating, consequently miscibility could be observed depending on the cooling rate. Also, at constant chain extender concentration, blends prepared with all-together mixing method showed higher crystallinity. In DMA analysis, blends prepared with pre-mixing method showed higher storage modulus. Modulus and tensile strength of all blends were also observed in the similar range in all blends systems.