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This study examines the restoration of waste plastic polymers based on LDPE,   HDPE or PP through dissolution/reprecipitation. Experimental conditions of   the recycling process, including type of solvent/non-solvent, original   polymer concentration and dissolution temperature were optimized. Results   revealed that by using the different prepared solvents/non-solvents at   various ratios and temperatures, the polymer recovery was always greater than   94%. The FTIR spectra and the thermal properties (melting point and   crystallinity) of the polymers before and after recycling were measured using   Differential Scanning Calorimetry (DSC). Mechanical properties of the waste   polymer before and after recycling were also measured. Besides small   occasional deviations, the properties did not change. The tensile strength at   maximum load was 7.1, 18.8, and 7.4 MPa for the recycled LDPE, HDPE and PP,   respectively and 7.78, 18.54 and 7.86 MPa for the virgin polymer. For the   waste, the strength was 6.2, 15.58 and 6.76 MPa

Quality restoration of waste polyolefin plastic material through the dissolution-reprecipitation technique