Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Coltelli, Maria Beatrice; Bianchi, Sabrina; Aglietto, Mauro

doi:10.1016/j.polymer.2006.12.043

Cited by 30 publications

(16 citation statements)

References 41 publications

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“…When PP-g-DBM is added to the immiscible PP/PA6 blends, the following reaction may take place between the ester groups of DBM and terminal amino groups of PA6 during melt mixing, resulting in the formation of PP-g-PA6 copolymer [16][17]. The product PP-g-PA6 acts as an interfacial agent for PP/PA6 blends system.…”

Section: Characterization Of the Reactionmentioning

confidence: 99%

“…Unfortunately, the MAH is toxic and of low boiling point, and it is difficult to prepare PP-g-MAH, which limits the application of PP-g-MAH as a compatibilizer for the immiscible blends such as PP/PA6. Like MAH, dibutyl maleate (DBM) can also chemically react with PA6 end groups [15][16][17], and DBM is of high boiling point and low toxicity. Here, the PP-g-DBM is used as a compatibilizer for PP/PA6 blends and the influences of PP-g-DBM on mechanical, rheological and morphological properties of PP/PA6 blends were investigated in detail in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Effects of polypropylene-g-dibutyl maleate on mechanical and rheological properties of PP/PA6 blends

Jia

2009

E-Polymers

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Abstract:The effects of polypropylene-grafted-dibutyl maleate (PP-g-DBM) used as compatibilizer on mechanical, rheological and morphological properties of polypropylene (PP) and nylon 6 (PA6) blends was systematically investigated in this paper. The results of Molau test, solvent extraction and differential scanning calorimetry (DSC) indicated the formation of PP-g-PA6 in vicinity of interfaces during melting extrusion. Owing to the reaction between the reactive groups of PPg-DBM and amine (-NH 2 ) end groups of PA6, the tensile and impact strength of the PP-g-DBM compatibilized PP/PA6 blends were much higher than that of the uncompatibilized PP/PA6 blends. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results indicated that the domain sizes of the dispersed phase in the compatibilized PP/PA6 blends decreased and the interfaces become more indistinct, which indicated a clear compatibiliting effect was induced by the PP-g-DBM in the immiscible PP/PA6 blends, i.e. the PP-g-DBM was an effective compatibilizer for the PP/PA6 blends. In addition, the rheological measurements showed the PP-g-DBM compatibilized PP/PA6 blends possessed higher pseudo plasticity, melt viscosity and flow activation energy.

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Section: Characterization Of the Reactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of polypropylene-g-dibutyl maleate on mechanical and rheological properties of PP/PA6 blends

Jia

2009

E-Polymers

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“…A cheap and sustainable reactive blending method for the compatibilization of PET/polyethylene blends consists of the use of diethyl maleate (DEM)-functionalized polyethylene in the presence of Zn(OOCCH 3 ) 2 [24] and Ti(OBu) 4 [25] transesterification catalysts. In fact, in both cases, in spite of the occurrence of side reactions, such as degradation of PET in the Zn-catalyzed system [26] and crosslinking of the compatibilizer precursor in the Ti-catalyzed one [25], the formation of grafted copolymer was clearly evidenced. The effect of the transesterification reaction depends on the structure of the metal derivatives and compatibilizer precursor.…”

Section: Introductionmentioning

confidence: 96%

Influence of compatibilizer precursor structure on the phase distribution of low density poly(ethylene) in a poly(ethylene terephthalate) matrix

Coltelli

Harrats

Aglietto

et al. 2008

Polymer Engineering & Sci

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In attempt to enhance the compatibility of PET/LDPE blends by using a proper functionalized polymer as third component, diethyl maleate (DEM)-functionalized ultralow density poly(ethylene) (ULDPE-g-DEM) and styrene-b-(ethylene-co-1-butene)-b-styrene triblock copolymer (SEBS-g-DEM) were prepared by radical functionalization in the melt. Immiscible PET/LDPE blends having compositions of 70/30 and 80/20 by weight were then extruded in the presence of 1-10% by weight of ULDPE-g-DEM and SEBS-g-DEM as compatibilizer precursors and ZnO (0.3% by weight) as transesterification catalyst. In both cases, evidences about the occurring of compatibilization between the two immiscible phases, thanks to the studied reactive processes, were obtained. Moreover, the phase distribution and particle size of blends were deeply investigated. Completely different kinds of phase morphology were achieved, as ULDPE-g-DEM stabilized a dispersed phase morphology, whereas SEBS-g-DEM favored the development of a cocontinuous phase morphology. The observed differences are tentatively explained on the basis of reactivity and physical features of polymers.

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“…The reaction between PET and PO-g-MA and the formation of PO-g-PET linkages have been proposed in some investigations for compatibilizing PET blends. [29][30][31][32] Zhang et al 33 blended recycled PET (RPET) with MA grafted linear low density polyethylene (LLDPE-g-MA) and found the formation of PET-co-LLDPE-g-MA. They also used MA grafted styrene-ethylene-butylene-styrene (SEBS-g-MA) as compatibilizer in RPET/LLDPE blends and indicated that the MA groups of SEBS-g-MA reacted with the hydroxyl end groups of PET to synthesize PET-co-SEBS-g-MA.…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of poly(ethylene terephthalate) modified by polypropylene‐graft‐maleic anhydride from rheological data

Khaledi

Ebrahimi

2018

J of Applied Polymer Sci

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During some investigations on compatibilizing poly(ethylene terephthalate) (PET) blends by maleic anhydride–grafted polyolefins (PO‐g‐MA), the reaction between PET and PO‐g‐MA and the formation of PO‐g‐PET were proposed. However, the effect of PO‐g‐MA on the rheological properties of PET has not been the aim of any specific study. In our study, polypropylene (PP)‐g‐MA was melt reacted with PET, and the effects of its content and grafting degree on the intrinsic viscosity and linear viscoelastic properties of PET were investigated. The results reveal that the addition of PP‐g‐MA leads to increasing intrinsic viscosity, which confirms the reaction between PP‐g‐MA and PET. Rheological measurements suggest that the addition of PP‐g‐MA improves the elastic behavior and increases the complex viscosity of PET. No shear thinning behavior was observed for any samples, indicating that branching is not widespread. The increase in PP‐g‐MA content or grafting degree leads to increases in the intrinsic and complex viscosities and improves the elastic behavior. Furthermore, we reported the unusual observation of an increasing viscosity with frequency in modified sa"mples due to the transesterification phenomenon. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46896.

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Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Cited by 30 publications

References 41 publications

Effects of polypropylene-g-dibutyl maleate on mechanical and rheological properties of PP/PA6 blends

Effects of polypropylene-g-dibutyl maleate on mechanical and rheological properties of PP/PA6 blends

Influence of compatibilizer precursor structure on the phase distribution of low density poly(ethylene) in a poly(ethylene terephthalate) matrix

Structural analysis of poly(ethylene terephthalate) modified by polypropylene‐graft‐maleic anhydride from rheological data

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