Synthesis and characterization of bis-amino ethyl terephthalamide from PET waste and its applications as hardener in DGEBA

Dutt, Krishna; Soni, Rakesh Kumar

doi:10.1007/s12588-014-9071-2

Cited by 17 publications

(16 citation statements)

References 19 publications

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“…As a result of having reactive amino end groups, N,N'-bis (2-aminoethyl)terephthalamide prepared from PET waste can be used as an epoxy resin hardener [11].…”

Section: -Aminoalkylmentioning

confidence: 99%

Thermal properties of α,ա- aminoalkylterephthalamides prepared from waste poly(ethyleneterephthalate) bottle and aliphatic diamines

Hoang

Dang

2017

Sci. Tech. Dev. J. - Nat. Sci.

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Trimers and pentamers of α,ա- aminoalkylterephthalamides were prepared from aminolysis of waste poly(ethyleneterephthalate) (PET) bottle with tetramethylene diamine (TMDA) and hexamethylene diamine (HMDA). The thermal properties of these products determined by DSC and TG showed that the melting points were the temperatures at which physical melting process and chemical transamidation polymerization occured concurrently. This chemical reaction had converted trimers and pentamers into polymers, then at the higher temperature ranges, the observed decomposition temperatures were just specific for newly formed polyamides, not for initial trimers or pentamers. The application of thermogravimetric chamber as mini reactor is quite useful to investigate the heating conditions for solid-state polymerization of α,ա- aminoalkylterephthalamides.

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“…As a result of having reactive amino end groups, N,N'-bis (2-aminoethyl)terephthalamide prepared from PET waste can be used as an epoxy resin hardener [11].…”

Section: -Aminoalkylmentioning

confidence: 99%

Thermal properties of α,ա- aminoalkylterephthalamides prepared from waste poly(ethyleneterephthalate) bottle and aliphatic diamines

Hoang

Dang

2017

Sci. Tech. Dev. J. - Nat. Sci.

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“…Further, drawbacks of other conventional chemical recycling methods (hydrolysis, methanolysis) like high temperature and high pressure conditions were aimed of being avoided by aminolysis and ammonolysis. After depolymerization, in general, the reaction products were applied as curing agents for epoxy resins, as components for polyurethane synthesis or as plasticizers [225][226][227][228].…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

“…The chemicals such as alkyl amines or liquid ammonia are used in excess for PET de-polymerization (Table 4). Aminolysis and ammonolysis mainly yielded the corresponding monomeric amides of terephthalic acid [223,[226][227][228][229][230][231][232][233][234]. The de-polymerization agent, which was mainly applied, was ethanol amine (EA, Table 4).…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

“…As for glycolysis, different catalysts were also applied for aminolysis, ammonolysis. Mainly metal acetates were used (zinc acetate, sodium acetate, potassium acetate, Table 4) [226,227,231,232]. Shukla and Harad studied the effect of sodium-, potassium acetate and acetic acid on efficiency of PET-aminolysis.…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

“…All described chemical recycling methods require either high pressure apparatus (hydrolysis, methanolysis) or toxic chemicals (alkyl amines, glycols, methanol, sulfuric acid, nitric acid) to yield mainly monomers of PET. In case of glycolysis precise process control is of crucial importance either to prevent re-polymerization or other side-reactions [8,9,148,153,226].…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

See 2 more Smart Citations

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

204

120

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Abstract.Recycling of poly(ethylene terephthalate) (PET) is of crucial importance, since worldwide amounts of PETwaste increase rapidly due to its widespread applications. Hence, several methods have been developed, like energetic, material, thermo-mechanical and chemical recycling of PET. Most frequently, PET-waste is incinerated for energy recovery, used as additive in concrete composites or glycolysed to yield mixtures of monomers and undefined oligomers. While energetic and thermo-mechanical recycling entail downcycling of the material, chemical recycling requires considerable amounts of chemicals and demanding processing steps entailing toxic and ecological issues. This review provides a thorough survey of PET-recycling including energetic, material, thermo-mechanical and chemical methods. It focuses on chemical methods describing important reaction parameters and yields of obtained reaction products. While most methods yield monomers, only a few yield undefined low molecular weight oligomers for impaired applications (dispersants or plasticizers). Further, the present work presents an alternative chemical recycling method of PET in comparison to existing chemical methods.

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Recycling Polyesters by Chemical Depolymerization

Cornell

2004

Modern Polyesters: Chemistry and Technology of Polyesters and Copolyesters

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In the presented paper, two basic strategies that can be used in the processes of chemical recycling of polyester material were described. The first of them involves increasing the molar mass of recycled materials in the solid-state polycondensation (SSP) process and/or joining their chains with various types of substances easily reacting with the end groups of polyesters (so-called extending agents). The essence of the second strategy is the degradation of the material under the influence of various protogenic agents (such as water, alcohols, glycols and amines) to obtain low-molecular products or oligomers that can be used as raw materials in the synthesis of many classes of polymers. The methods that are already used in PET [poly(ethylene terephthalate)] recycling and the possibility of their extension to other types of polyesters are both shown.

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Synthesis and characterization of bis-amino ethyl terephthalamide from PET waste and its applications as hardener in DGEBA

Cited by 17 publications

References 19 publications

Thermal properties of α,ա- aminoalkylterephthalamides prepared from waste poly(ethyleneterephthalate) bottle and aliphatic diamines

Thermal properties of α,ա- aminoalkylterephthalamides prepared from waste poly(ethyleneterephthalate) bottle and aliphatic diamines

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Recycling Polyesters by Chemical Depolymerization

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