Chemical Recycling and Liquefaction of Rigid Polyurethane Foam Wastes through Microwave Assisted Glycolysis Process

Nikje, Mir Mohammad Alavi; Nikrah, Mahin

doi:10.1080/10601320701285003

Cited by 30 publications

(30 citation statements)

References 20 publications

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“…The degradation of rigid PU foam wastes through microwave-assisted glycolysis was investigated by Nikje and Nikrah [45]. DEG was used as a reagent-solvent and several catalysts were studied, including NaOH, KOH, CH 3 COONa and (CH 3 COO) 2 Zn.…”

Section: Polyurethanesmentioning

confidence: 99%

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Polymer Degradation Under Microwave Irradiation

Achilias

2014

Advances in Polymer Science

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Development of advanced, environmentally friendly and energy-saving techniques for the chemical recycling of polymers is of paramount importance in the polymer industry. Understanding polymer degradation is the scientific key behind this technological challenge. Recent research on the application of microwave irradiation to polymer degradation is presented in this review. Results have shown the potential advantage of microwaves for complete polymer degradation in a significantly reduced time scale compared with conventional heating. The benefits of using microwave irradiation in the degradation of polyesters [e.g. poly(ethylene terephthalate) and polycarbonate], polyurethanes, polyamides, poly[alkyl (meth)acrylates], polystyrene and other polymers is presented. Moreover, the effect of microwave heating on the pyrolysis of commodity polymers such as polyethylene, is also discussed. Finally, the double role of materials used traditionally as solvents, reagents or catalysts, but now also as microwave absorbers in polymer degradation is explored.

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Section: Polyurethanesmentioning

confidence: 99%

“…The group of Alavi Nikje has carried out a lot of work on this subject, which is presented below [45][46][47][48][49][50].…”

Section: Polyurethanesmentioning

confidence: 99%

Polymer Degradation Under Microwave Irradiation

Achilias

2014

Advances in Polymer Science

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“…In glycolysis, hydroxyl‐terminated products (polyols) can be formed via transesterification of glycols with urethane, urea, or allophanate bonds in WPUF in the presence of suitable catalysts. Therefore, the products obtained after glycolysis of PUFs can be employed as raw materials in the manufacture of new rigid or flexible polyurethane foams …”

Section: Introductionmentioning

confidence: 99%

“…They also found that the as‐prepared RPUFs exhibited a finer cell structure and comparable thermal conductivity and compressive strength relative to virgin RPUF. Meanwhile, Nikje and Nikrah investigated the preparation of new RPUFs using a mixture of recycled and virgin polyols. The recycled polyol was obtained by glycolysis of RPUFs using diethylene glycol under microwave irradiation in the presence of different types of catalysts [NaOH, KOH, NaAc, or Zn(Ac) 2 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable rigid polyurethane foams based on recycled polyols from chemical recycling of waste polyurethane foams

Shin

Kim

Liang

et al. 2019

J of Applied Polymer Sci

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The preparation and characteristics of rigid polyurethane foams (RPUFs) based on recycled polyol obtained by glycolysis of waste RPUF scraps from end-of-life refrigerators were investigated. To deactivate the amine adducts derived from isocyanates, the recycled product obtained after depolymerization was chemically modified via addition polymerization of propylene oxide. Two kinds of recycled polyols with different hydroxyl values and viscosity were blended with conventional virgin polyether polyol to prepare the RPUFs. The effects of the recycled polyols on the physical properties of RPUFs such as cell structures, compressive strength, thermal conductivity, and limiting oxygen index were discussed. It was found that the RPUFs from recycled polyols showed superior compressive strength, thermal insulation property, and selfextinguishing property compared with conventional control foam. The results of this study reveal that the recycled polyols could be used as feedstock for RPUFs with superior performance.

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“…As publicações referentes aos parâmetros de processamento da glicólise fazem-se concluir que dentre os catalisadores previamente analisados, o NaOH e DBTDL são os mais promissores em termos cinéticos, promovendo a dissolução do poliuretano na solução de glicol com as melhores eficiências mássica e molar, respectivamente. 58 A relação ótima de mistura entre poliuretano e solução de glicol se dá na faixa entre 1/1,5 e 1/2,0 42 sendo o DEG glicol mais utilizado 19,26,27,29,44,45,46 A partir do planejamento de experimentos proposto foi possível estabelecer uma superfície de resposta para o grau de clivagem dos grupos uretano. Para isso, foi determinado como parâmetro de resposta a área da banda atribuída aos estiramentos C=O da carbonila do grupo uretano, observados em 1727 cm -1 .…”

Section: Resultsunclassified

Reciclagem de poliuretanos rígidos através da glicólise assistida por micro-ondas e seus impactos na reaplicação e propriedades de espumas recicladas

Licciardi¹

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Chemical Recycling and Liquefaction of Rigid Polyurethane Foam Wastes through Microwave Assisted Glycolysis Process

Cited by 30 publications

References 20 publications

Polymer Degradation Under Microwave Irradiation

Polymer Degradation Under Microwave Irradiation

Sustainable rigid polyurethane foams based on recycled polyols from chemical recycling of waste polyurethane foams

Reciclagem de poliuretanos rígidos através da glicólise assistida por micro-ondas e seus impactos na reaplicação e propriedades de espumas recicladas

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