Polypropylene carbonate (PPC) is an interesting biodegradable thermoplastic derived from carbon dioxide to replace the traditional petroleum-based polymers. However, PPC has low thermal stability and poor melt strength, resulting in low processability and product’s performance. It has been reported that the addition of chain extender (CE) can improve the rheological properties of polymer by increasing the molecular weight of polymer matrix. In this research, the effect of type of chain extender, such as type of functional group and molecular weight, on the melt strength as well as thermal and mechanical properties of PPC was investigated. Chain extended PPC films (PPC-CE) were prepared by using an internal mixer. Cross-sectional fractured surface of films after mechanical test were observed using scanning electron microscope (SEM). The thermal analysis revealed that PPC-CE blends showed higher glass transition temperature (Tg) and decomposition temperature (Td) than neat PPC. It was found that the mechanical properties of PPC-CE also increased. It can be concluded that an introduction of a small amount of chain extender was an effective way to improve the properties of PPC by extending the molecular weight of PPC, enlarging the processing window of PPC in some polymer processing techniques. Keyword : Poly(propylene carbonate), chain extender, Structure development.