Renewable polymer made from renewable material is one of the most important groups of polymer because of their versatility and they can be manufactured in a wide range of insulation and automotive application. In this project, renewable polymer based on waste vegetable oil were synthesized and crosslink with commercial polymethane polyphenyl isocyanate. The renewable polymer foam (RPF) was compressed by using hot compression moulding technique at 90 oC based on the evaporation of volatile matter and known as compressed renewable polymer (CRP). The thermal degradation and activation energy of RPF and CRP samples is consistant with the increasing of UV irradiation time at the first degradation, second degradation and third degradation. This is due to thermal stability of samples at the hard segment has a great influence on the thermal stability of soft segment. A higher thermal stability of hard segment leads to a higher degradation temperature of soft segment.