Synthesis and characterization of polysulfone based on poly(ethylene terephthalate) waste

Abstract

The recycling process of Poly(ethylene terephthalate) (PET) wastes is commercially important since it converts a waste material into a value‐added product and also helps to alleviate environmental pollution. PET waste was depolymerized in the presence of ethylene glycol and manganese acetate as a catalyst. Bis(hydroxyethyl terephthalate), (BHET) and other oligomers are predominately the glycolyzed products (GP). These GP products were reacted with a prepared dichlorodiphenylsulfone (DCDPS) in presence of dried potassium carbonate. Two polysulfones (A &B) with different number average molecular weights, 1787 and 3162 g/mol. were obtained, respectively. The chemical structures of the resulting two polysulfones were elucidated using 1HNMR and characterized by the known conventional analysis techniques (e.g. FTIR, GPC, DSC, TGA…). The prepared polysulfone (B) disclosed higher thermal stability with respect to the initial reactants. The originality of this study was derived from the use of waste materials to yield a product that has acceptable high thermal stability which provide many beneficial applications in various industrial fields. POLYM. ENG. SCI., 55:1671–1678, 2015. © 2014 Society of Plastics Engineers

Immobilization of sulfate waste simulate in polymer–cement composite based on recycled expanded polystyrene foam waste: Evaluation of the final waste form under freeze–thaw treatment

“…The u-phase has comparatively low density compared to the other hydration products as previously stated [28]. The minor decreases in both total porosity (%) and water absorption (%) up to 30 cycle can be attributed to either the increase in the crosslinking of the expanded polystyrene during the thawing cycles [25] or filling of the matrices pores with the ettringitte formed early as explained. Then, the afterword increases in the both characters, namely, the total porosity and the water absorption were detected after 30 FTC.…”

“…The tolerability of polymer cement composite (based on expanded polystyrene foam wastes) as a candidate matrix for solidification of radioactive sulfate waste concentrate, originated from BWRs, against the freeze-thaw treatment has been evaluated. The repeated cycles of freezing and thawing have the accumulative affect and it is the repeated cycles rather than the single occurrence that causes damage [25].…”

Structure elucidation and toxicological evaluation of cyclic Polyethersulfone oligomers present in extracts of membrane filters

“…[ 22 ] Another patent describes the synthesis of the linear oligomers. [ 23 ] We tried several synthetic reactions from these patents and similar procedures, [ 24 ] but were unable to yield the cyclic oligomers in noteworthy concentrations as confirmed by LC‐UV‐MS. Even though several solvents (DMSO, DMAc/toluene, and DMSO/toluene) and bases (Na 2 CO 3 , K 2 CO 3 , NaOH, KOH, and Cs 2 CO 3 ) were tested in combination, mostly unreacted educts were present in the reaction mixtures.…”

Potential applications of granite waste powder as an add-value polymer composite product

“…7,8,14 Aminolysis and glycolysis are the most common applied techniques for chemical processing of PET wastes. [15][16][17][18][19][20][21][22] Very few or may be none published works discussed formulation of polymer granite composite (PGC) based on polyester obtained from chemical recycled the post consumer PET waste, as a matrix and granite scraps, as an inorganic filler. Paul et al 23 used the virgin polyester resin incorporating particulate ceramic granite to prepare composite while Piratelli-Filho and Shimabukuro 24 applied an epoxy polymeric matrix reinforced with particulate ceramic granite.…”