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ii Polymeric materials are of interest to the fiber optics industry as glass-silica fibers are prone to fracture. However, the thermal resistance properties of current polymeric materials have limited their use in some optical applications including high performance lasers and high speed telecommunication systems. Therefore, it is of interest to develop new polymer materials and systems with enhanced thermal properties and processability for application in optics. This work focuses on the novel Perfluorocyclobutyl (PFCB) polymer systems. PFCB polymers possess characteristics that make them suitable for optics applications including: a low refractive index, high thermal stability and high chemical resistance. However, little is known about the thermal and rheological properties and the processability of PFCB polymers. In this study, two PFCB polymeric materials are investigated: 4,4’-Bis(4-trifluorovinyloxy) biphenyl (hereafter referred to as BPVE) and 2,2-Bis(4-trifluorovinyloxyphenyl)-1,1,1,3,3,3-hexafluoropropane (hereafter referred to as 6F). BPVE and 6F of different molecular weights were employed. Both th