Synthesis and characterization of unsaturated polyesters based on the aminolysis of poly(ethylene terephthalate)

Elsaeed, Shimaa M.; Farag, Reem K.

doi:10.1002/app.29527

Cited by 28 publications

(15 citation statements)

References 40 publications

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“…53 Shukla and Harad investigated aminolytic depolymerization of PET waste, including fibers and disposable soft drink bottles by using excess ethanolamine (EA). The PET to ethanolamine molar ratio was fixed at 1:6, and glacial acetic acid, sodium acetate, and potassium sulphate were used as catalysts at a concentration ranging from 0.3% to 55 Shamsi et al also followed the scenario introduced by Shukla and Harad to produce BHETA. Afterward polyurethanes were synthesized using BHETA, 1,4-butanediol, ether-type polyol, and various molar ratios of hexamethylene diisocyanate (HDI).…”

Section: Aminolysismentioning

confidence: 99%

“…Then, the different chemical structure unsaturated polyesters were synthesized by the reaction of BHETA with maleic anhydride (MA) and saturated aliphatic dibasic acids such as decanedioic acid (DA), tetradecanedioic acid (TDA), and octadecanedioic acid. In order to verify the structure of the prepared polyesters, H‐NMR was used (ODA) 55 …”

Section: Chemical Recycling Of Petmentioning

confidence: 99%

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Chemical recycling of PET: A stepping‐stone toward sustainability

Shojaei

Abtahi

Najafi

2020

Polymers for Advanced Techs

129

113

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This paper focuses explicitly on the chemical approaches involved in the recycling of polyethylene terephthalate (PET). Due to the high rate of consumption as well as nonbiodegradability, PET plays a crucial role as one of the most significant sources of accumulated waste in the landfill which jeopardizes our planet. To address this issue as well as increased environmentally conscious, running out of landfill space, natural resource, and energy conservation, and producing value-added chemicals to use as building block or co-products, the chemical recycling methods have been evolved. Therefore, there has been an attempt to have a comprehensive review of the five types of conventional recycling methods namely hydrolysis, methanolysis, glycolysis, aminolysis, and ammonolysis studied by researchers over the last two decades. In this regard, the influence of diverse depolymerization reaction variables for instance, traditional catalyst, temperature profile, ionic liquid catalysts, phase transfer catalyst, microwave assistance, etc was reported. Moreover, the upsides and downsides of each technique were considered.

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Section: Aminolysismentioning

confidence: 99%

Section: Chemical Recycling Of Petmentioning

confidence: 99%

Chemical recycling of PET: A stepping‐stone toward sustainability

Shojaei

Abtahi

Najafi

2020

Polymers for Advanced Techs

129

113

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“…(Achilias et al, 2011;Hoang and Hen, 2013). Different products formed in aminolysis reactions can be used for various applications such as synthesis of plasticiser for polyvinyl chloride (PVC) (More et al, 2014a(More et al, , 2014bAchilias et al, 2010), unsaturated polyester resin (Elsaeed and Farag, 2009), polyurethane resin (Kapadi et al, 2015;Sadeghi et al, 2011), polyesteramide resin (More et al, 2014(More et al, , 2014b, surfactants (El-Sherbiny et al, 2010), etc. Hence, recycling of PET not only solves its environmental concern but also helps in value creation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of tetra(2,2-hydroxyethylene) terephthalamide from PET waste and its application in synthesis of polyesteramide coating

Rane

Mhaske³

2017

PRT

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Purpose The purpose of this paper is to discuss the synthesis of polyesteramide resin from the monomer obtained from poly (ethylene terephthalate) (PET) waste and study of the structure – property relation for the same in polyesteramide coating. The purpose is also not only to just target the polymeric waste but also to study the effect of the structure of monomer obtained from such waste in final coating. Design/methodology/approach PET waste was depolymerised using diethanolamine to tetra(2,2-hydroxyethylene) terephthalamide (THETA). Four functional hydroxyl terminated monomers were generated having amide linkage as a structural part. THETA was used for the synthesis of polyesteramide resin along with fatty amide of oil, and concentration of the THETA was varied. The synthesised polyesteramide resin was cured with MF resin and tested for physico-chemical, thermal and anticorrosive properties. Findings PET was successfully depolymerised to monomeric level using diethanolamine as a reactive agent. It is observed that as the concentration of THETA increases, the hardness of the coating increases, as aromatic concentration increases in the coating. The amide linkage helps to improve adhesion as well as hydrophobicity because an aliphatic long chain of fatty amide and aromatic linkage of THETA helps in improving anticorrosive properties of the coating. Practical implications This method is the useful key to solve the polymeric waste problem. PET can be easily depolymerised using diethanolamine and polyesteramide resin synthesised from it. Hence, waste material can be converted into the coating by reacting it with renewable resources. Originality/value To the best of the authors’ knowledge, this is the first study which uses THETA as a monomer for the synthesis of polyesteramide resin and study of its various concentrations on coating properties. The coating is obtained from waste material; hence, polymeric waste issue is also solved, and dependency on the petroleum resources to obtain raw materials for coating is also depleted partially. The study also helps to understand the effect of the structure of monomers on the properties of the coating.

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“…During aminolysis of PET with methylamine, the methyl terephthalamide is obtained, which is not enough reactive for its recycling into any useful product through further reactions 22. Earlier, in our laboratory, we have carried out aminolysis of PET waste using ethanol amine to get pure bis (2‐hydroxy ethylene) terephthalamide16 which has been utilized in synthesis of polyurethanes,26,27 unsaturated polyesters,28 epoxy hardners,26 and nonionic polymeric surfactants 29…”

Section: Introductionmentioning

confidence: 99%

Recycling of PET waste using 3‐amino‐1‐propanol by conventional or microwave irradiation and synthesis of bis‐oxazin there from

Shah

Borude

Shukla

2012

J of Applied Polymer Sci

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There is a growing interest in recycling of post-consumer poly(ethylene terephthalate) (PET) waste for both environmental and economic reasons. PET in the form of disposable soft drink bottle waste was subjected to depolymerization via aminolysis using excess of 3-amino-1-propanol under soxhlet by conventional heating as well as microwave irradiation using catalyst sodium acetate or potassium sulfate. The product obtained was characterized after purification by using melting point, IR spectroscopy, nuclear magnetic resonance, and differential scanning calorimeter and was found to be bis-(3-hydroxy propyl) terephthalamide (BHPTA). The BHPTA thus obtained was subjected to cyclization reaction using thionyl chloride to obtain bis-oxazin under conditions of ambient temperature. Bis-oxazin has applications in polymer synthesis as a chain extender or a cross linking agent.

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Synthesis and characterization of unsaturated polyesters based on the aminolysis of poly(ethylene terephthalate)

Cited by 28 publications

References 40 publications

Chemical recycling of PET: A stepping‐stone toward sustainability

Chemical recycling of PET: A stepping‐stone toward sustainability

Synthesis of tetra(2,2-hydroxyethylene) terephthalamide from PET waste and its application in synthesis of polyesteramide coating

Recycling of PET waste using 3‐amino‐1‐propanol by conventional or microwave irradiation and synthesis of bis‐oxazin there from

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