INVESTIGATION OF THE CONDITIONS FOR THE FORMATION OF PRIMARY FIBER-FORMING POLYETHYLENE TEREPHTHALATE FROM ITS WASTE
Keywords:Secondary polyethylene terephthalate, alcoholysis, ethylene glycol, bishydroxyethylene terephthalate, synthesis, polyethylene terephthalate, fiber-forming, physicochemical and technological properties
This article is dedicated to identifying the potential for recovering fibrous polyethylene terephthalate, including household waste (used containers, so-called "flasks"). BHET was released by alcohol decomposition of SPET and ethylene glycol. The main physicochemical properties of BHET have been determined. The degree of purity of BHET was determined by parallel measurement of the same index of BHET obtained by its reverse synthesis from DMT and EG. The purity of the resulting BHET was also determined by DSC and IR spectroscopy. The results of these studies have led to the conclusion that BHET is sufficiently pure and suitable for use as a monomer.
Next, the primary PET was synthesized from BHET. At the same time, the physicochemical properties of primary PET for the manufacture of beverage containers, used secondary PET, DMT and PET from EG were determined. Research results have shown that primary PET has the highest molecular weight and is partially crystalline, and after treatment and manipulation, destructive processes reduce the molecular weight of PET and also reduce the crystallinity of the polymer. Experimental synthetic PET from DMT and EG is also partially crystalline. PET of BHET is amorphous.