The Solid State Postcondensation of PET, 4

Gantillon, Barbara; Spitz, Roger; Lepage, Jean-Luc; McKenna, Timothy F. L.

doi:10.1002/mame.200300292

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…McKenna et al92–94 studied the improvement of the properties of the synthesized PET by the process of solid‐state poly‐condensation of pre‐polymers with a number average of polymerization on the order of 5–40. It was shown that by correctly choosing the pre‐polymerization conditions it is possible to crystallize the product and to directly polymerize it in a dispersed phase.…”

Section: Recycling Of Pet a Promising Endeavormentioning

confidence: 99%

New Motivation for the Depolymerization Products Derived from Poly(Ethylene Terephthalate) (PET) Waste: a Review

Nikles

Farahat

2005

Macro Materials & Eng

233

138

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Summary: Over the last several decades, the process of recycling polymer waste has been attracting the attention of many scientists working on this issue. Polymer recycling is very important for at least two main reasons: firstly, to reduce the ever increasing volumes of polymer waste coming from many sources: from daily life packaging materials and disposables and secondly, to generate value‐added materials from low cost sources by converting them into valuable materials similar, to some extent, to virgin materials. Poly(ethylene terephthalate) (PET) occupies the top of the list of polymers to be recycled due to its easy recycling by different ways, which, in accordance, give variable products that can be introduced as starting ingredients for the synthesis of many other polymers. PET can by recycled by hydrolysis, acidolysis, alkalolysis, aminolysis, alcoholysis and glycolysis. Glycolysis is the breakdown of the ester linkages by a glycol, resulting in oligomers or oligoester diols/polyols with hydroxyl terminal groups. Oligoesters coming from the glycolysis of PET waste have been well known for a number of decades to be utilized as a starting material in the manufacture of polyurethanes, unsaturated polyesters and saturated polyester plasticizers. But, as a current motivation, we are reporting on a new application for these oligoester diols/polyols by converting the hydroxyl terminals into acrylate/methacrylate groups. These new acrylated/methacrylated oligoesters have been tested as UV curable monomers and gave promising results from the point of view of their curability by UV and their mechanical properties. The new motivations open the potential for the market to apply the depolymerization products of PET waste for UV curable coatings, useful for wood surfaces, paints and other applications.Recycling of PET polymer by different chemical routes.magnified imageRecycling of PET polymer by different chemical routes.

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Section: Recycling Of Pet a Promising Endeavormentioning

confidence: 99%

New Motivation for the Depolymerization Products Derived from Poly(Ethylene Terephthalate) (PET) Waste: a Review

Nikles

Farahat

2005

Macro Materials & Eng

233

138

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“…For these runs, only the polymerisation time was varied, the experimental protocol and cooling stage remain as indicated above. All of the prepolymers were milled before performing the WAXS analysis (the reason for this is that later it will be necessary to use milled prepolymers in the SSP step [9] ). Although not shown here for the sake of brevity, the WAXS spectra showed that pLL-PTA samples with a DP n of less than 8 had very different forms than those higher than this limit (which corresponds to a number-average molecular weight of approximately 1 700 g/mol).…”

Section: Influence Of Dp N On the Lamellar Thicknessmentioning

confidence: 99%

The Solid State Postcondensation of PET, 3

Gantillon

Spitz

McKenna

2004

Macro Materials & Eng

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Summary: It was demonstrated that it is possible to produce prepolymers with a number‐average degree of polymerisation on the order of 5–40 directly in a liquid‐liquid dispersion in less than three hours. It was also shown that prepolymers made via this route and rapidly crystallised by the addition of a dispersant at ambient temperature are more porous than prepolymers made in an industrial liquid melt process.SEM micrograph of prepolymers pLL‐PTA with \overline {DP} _{\rm n} = 28, dp ∈ 63–125 μm.magnified imageSEM micrograph of prepolymers pLL‐PTA with \overline {DP} _{\rm n} = 28, dp ∈ 63–125 μm.

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“…SSP is usually carried out under moderate temperature conditions in the reaction temperature range of 200–230°C. Thus, SSP could raise the molecular weight of PET with less thermal degradation than melt phase polymerization, while reducing the contents of by‐products, such as acetaldehyde and oligomers, to acceptable levels . SSP of PET involves two reversible equilibrium reactions, esterification and transesterification and it is controlled by two types of diffusion.…”

Section: Introductionmentioning

confidence: 99%

Solid‐state polymerization of poly(ethylene terephthalate): Effect of organoclay concentration

Dini

Carreau

Kamal

et al. 2014

Polymer Engineering & Sci

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Poly(ethylene terephthalate) (PET)/Cloisite 30B (C30B) nanocomposites of different organoclay concentrations were prepared using a water-assisted extrusion process. The reduction of the molecular weight (M w ) of the PET matrix, caused by hydrolysis during water-assisted extrusion, was compensated by subsequent solid-state polymerization (SSP). Viscometry, titration, rheological, and dynamic scanning calorimetry measurements were used to analyze the samples from SSP. The weight-average molecular weight (M w ) of PET increased significantly through SSP. PET nanocomposites exhibited solid-like rheological behavior, and the complex viscosity at high frequencies was scaled with the M w of PET. The Maron-Pierce model was used to evaluate the M w of PET in the nanocomposites before and after SSP. It was found that the extent and the rate of the SSP reaction in nanocomposites were lower than those for the neat PETs, due to the barrier effect of clay platelets. Consequently, the SSP rate of PET increased with decreasing particle size for the neat PET and PET nanocomposites. The effect of the M w of PET on the crystallization temperature, crystallinity, and the half-time, t1 =2 , of nonisothermal crystallization was also investigated. With increasing M w of PET, t1 =2 increased, whereas T c and X c decreased. POLYM. ENG. SCI., 54:2925-2937

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The Solid State Postcondensation of PET, 4

Cited by 9 publications

References 19 publications

New Motivation for the Depolymerization Products Derived from Poly(Ethylene Terephthalate) (PET) Waste: a Review

New Motivation for the Depolymerization Products Derived from Poly(Ethylene Terephthalate) (PET) Waste: a Review

The Solid State Postcondensation of PET, 3

Solid‐state polymerization of poly(ethylene terephthalate): Effect of organoclay concentration

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