PolyethyleneTerephthalate (PET) Hydrolase Process Optimization

Polyethylene terephthalate (PET) is chemically inert and remarkably stable, its accumulation inecosystems around the world raises environmental pollution concerns. In this research an optimumcondition for the enzymatic hydrolase of PET and biodegradable polyesters (PLA, PCL and PHB)were studied. Optimal conditions find by design of experiments (DOE) method and UV-vis test forPET as a reference and study of the biopolymers in these conditions and enzymatic hydrolase wasperformed on the polyester family. To evaluate the performance of hydrolase, TGA, DSC and SEMtests were performed. DSC thermograms showed that initially, intensity of changes in PETamorphous phase during hydrolysis is very high. After a certain period, the crystal phase is influencedtoo. But due to the diffusion resistance of the phase, the process is continuing with a lower rate forbio-polyesters. Due to the biodegradability of biopolymers, hydrolase is much more intense than PET.The results showed that the proposed hydrolase technique has a good result on the biodegradation ofpolyesters and this method can be used to enhance PET biodegradation

کلیدواژه ها:

Enzymatic degradation ، Hydrolase ، Polyethylene terephthalate ، Polylactic acid ، Polycaprolactone ، Poly ۳-hydroxybutyrate