Molding History Dependence of The Mechanical Properties of Recycled Amorphous Plastics

Previously, we had investigated systematic evaluation of molecular properties, physical properties and inner structures of recycled semi-crystalline plastics. From the investigation, we had found that main reason of the poor physical properties of semi-crystalline recycled plastics is physical degradation and can regenerate the mechanical properties by selecting the best physical molding condition. In this time, we investigated the effect of the difference of the molding conditions on the melt viscoelasticity and the tensile properties. From the results, in the case of amorphous polymer, even after keeping the long enough in molten state than the longest relaxation time, molding history remains. And also, the physical properties were better than the virgin plastics. Addition, by keeping even more prolonged molten state, it was also found that it would have a ductile characteristics. From the SAXS experiments, we had the suggesting results that the transition comes from the construction of higher structure in the inner structure of amorphous plastics.