Acrylonitrile(AN)-Vinyl acetate (VAc) copolymers (AN/VAc) were synthesized by redox polymerization and microencapsulated phase change materials (MicroPCMs) were incorporated at the polymerization step. The effect of VAc monomers and/or the MicroPCMs on composition, melting point ($T_{m}$), exothermic peak value ($T_{d}$), average molecular weight ($M_{eta}$) crystallinity of the copolymers were examined by Fourier Transform Infrared Spectroscopy (FTIR), Elementary Analysis, Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TG), Ubbelohde viscosimeter and X-ray Diffraction (XRD). The compositions of the ANNAc agreed well with the feed ratios. The melting peak shifted to a lower temperature ($267^{circ}C$) with increasing concentration of VAc monomers and/or MicroPCMs, while the exothermic peak shifted to the higher temperature ($324^{circ}C$). The average molecular weight of the copolymer was approximately 31,000. The crystallinity of the copolymers decreased with increasing content of VAc monomers and/or MicroPCMs.