Reactive extrusion of recycled poly(ethylene terephthalate) with polycarbonate by addition of chain extender

Abstract

Poly(ethylene terephthalate) (PET) resin is one of the most widely used engineering plastic with high performance, but the poor impact strength limits its applications for the notch sensitivity. In this research, toughened PET alloy was prepared by blending recycled PET with polycarbonate (PC) and MDI (methylenediphenyl diisocyanate). Intrinsic viscosity and melt viscosity measurements proved increase of the molecular weights of PET via chainextending reaction. FTIR and DMA results proved that some PET-PC copolymers were produced and the compatibility of PET phase and PC phase was improved. In addition, the reaction induced by MDI also affected the crystallization behaviors of PET, as observed from DSC results, and the crytallinity of PET decreased with the increase of MDI content. For all of these effects of MDI of increasing of molecular weight, improving of compatibility, and limiting the crystallization behaviors of PET/PC alloy, the notched-impact strength was greatly improved from 17.3 to 70.5 kJ/m 2 .

Effects of composition and transesterification catalysts on the physico-chemical and dynamic properties of PC/PET blends rich in PC

“…The miscibility of the PET/PC blends has been controversially discussed in literature, from completely miscible for all compositions [2], partially miscible [3,4] to completely immiscible for all compositions [5][6][7][8]. Blends of PET/PC were reported to be miscible in the high polyester range, but blends below 70% polyester were seemed to be immiscible [3,4].…”

Structural features and relaxation properties of PET/PC blends containing impact strength modifier and chain extender

“…The MFIvalues were noticed to decrease for all of the compositions. The latter fact is indicative of efficiency of MDI as a chain extender in the blends under investigation [19]. It can be understood, therefore, that PP/EPDM present in PET/PC blends is not Here and henceforth, the compositions are marked as in Table 1.…”

“…The PP/EPDM concentration was constant, 5 wt%, in all of the compositions tested ( Table 1). The chain extender, as in work [19], was methylene diphenyl diisocyanate (MDI); its concentration was 1 wt%.…”

Chain extension of poly (ethylene terephthalate) by reactive extrusion with secondary stabilizer

“…These rejects are almost always deposited in land wastes, causing pollution or several others environmental problems 3,5,6 . Many studies have been carried out with the use of chain extenders to recover properties of low molecular weight PET [7][8][9][10][11][12][13][14] . Chemical compounds such as anhydride and organophosphorus are some agents used as chain extender for PET.…”

“…Chemical compounds such as anhydride and organophosphorus are some agents used as chain extender for PET. Chain extenders have two or more reactive sites in molecule, which can react with terminal groups of polymeric chains, bonding each other and increasing molecular weight of the polymer [11][12][13][14][15][16] . In this work was studied the effects of the reactive incorporation of the stabilizer Irgafos 126 (IRG) on the PET wastes, which have showed an action as a chain extender for PET.…”