The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Tsutomu Hirose - One of the best experts on this subject based on the ideXlab platform.
-
depolymerization mechanism of poly ethylene Terephthalate in supercritical methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high molecular weight (IV value (intrinsic viscosity) = 0.84) was depolymerized in a batch reactor at temperatures between 543 and 573 K under estimated pressures of 0.1−15 MPa. In addition to PET with high molecular weight, PET with low molecular weight, such as its oligomer (trimer), bis-hydroxyethyl Terephthalate (BHET), and methyl-(2-hydroxyethyl) Terephthalate (MHET), was used as a model reactant to clarify the depolymerization pathway of poly(ethylene Terephthalate) in supercritical methanol. The reaction products were analyzed with size-exclusion chromatography, high-performance liquid chromatography, and high-performance liquid chromatography−mass spectrometry. The main products of each reaction were the monomers, dimethyl Terephthalate (DMT) and ethylene glycol (EG). The depolymerization of high molecular we...
-
Depolymerization Mechanism of Poly(ethylene Terephthalate) in Supercritical Methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high ...
Minoru Genta - One of the best experts on this subject based on the ideXlab platform.
-
depolymerization mechanism of poly ethylene Terephthalate in supercritical methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high molecular weight (IV value (intrinsic viscosity) = 0.84) was depolymerized in a batch reactor at temperatures between 543 and 573 K under estimated pressures of 0.1−15 MPa. In addition to PET with high molecular weight, PET with low molecular weight, such as its oligomer (trimer), bis-hydroxyethyl Terephthalate (BHET), and methyl-(2-hydroxyethyl) Terephthalate (MHET), was used as a model reactant to clarify the depolymerization pathway of poly(ethylene Terephthalate) in supercritical methanol. The reaction products were analyzed with size-exclusion chromatography, high-performance liquid chromatography, and high-performance liquid chromatography−mass spectrometry. The main products of each reaction were the monomers, dimethyl Terephthalate (DMT) and ethylene glycol (EG). The depolymerization of high molecular we...
-
Depolymerization Mechanism of Poly(ethylene Terephthalate) in Supercritical Methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high ...
Sebastián Muñoz-guerra - One of the best experts on this subject based on the ideXlab platform.
-
Preparation and hydrolytic degradation of sulfonated poly(ethylene Terephthalate) copolymers
Polymer, 2003Co-Authors: Oscar Gaona, Darwin P. R. Kint, Antxon Martínez De Ilarduya, Abdelilah Alla, Jordi J. Bou, Sebastián Muñoz-guerraAbstract:A series of poly(ethylene Terephthalate-co-ethylene 5-sodiosulfoisophthalate) copolyesters containing from 1 up to 50 mol% of sulfonated units was prepared by melt polycondensation from ethylene glycol and mixtures of dimethyl Terephthalate and dimethyl 5-sodiosulfoisophthalate. The resulting copolymers had a random microstructure and contained oligo(ethylene glycol) units in amounts increasing with the content in sulfonated isophthalate units. Copolyesters with more than 20 mol% of 5-sodiosulfoisophthalic units were amorphous and easily soluble in water. The hydrodegradability of the copolyesters was very high as compared to poly(ethylene Terephthalate), and increased with the content in sulfonated units. It was demonstrated that the susceptibility to acidic hydrolysis of these copolymers is mainly due to the presence of the sodium sulfonate groups, the influence of the oligo(ethylene glycol) units in this regard being noticeable but limited.
-
A review on the potential biodegradability of poly(ethylene Terephthalate)
Polymer International, 1999Co-Authors: Darwin P. R. Kint, Sebastián Muñoz-guerraAbstract:This paper reviews the state of the art in the field of the hydrolytic degradation of poly(ethylene Terephthalate) (PET) under bio-environmental conditions. Most of the papers published so far on this subject have been focused on the hydrolysis of PET at high temperatures. Although some authors claim to enhance the biodegradation properties of this aromatic polyester by copolymerization with readily hydrolysable aliphatic polyesters, no clear and satisfying conclusions can yet be formulated. Poly(ethylene Terephthalate-co-lactic acid), poly(ethylene Terephthalate-co-ethylene glycol), and poly(ethylene Terephthalate-co-e-caprolactone) block and random copolymers are the modifications mainly investigated for biodegradable applications. The hydrodegradability and biodegradability of PET, PET copolymers and PET blends are detailed in this review. A total of 89 references including 16 patents are cited. © 1999 Society of Chemical Industry
Mitsuru Sasaki - One of the best experts on this subject based on the ideXlab platform.
-
depolymerization mechanism of poly ethylene Terephthalate in supercritical methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high molecular weight (IV value (intrinsic viscosity) = 0.84) was depolymerized in a batch reactor at temperatures between 543 and 573 K under estimated pressures of 0.1−15 MPa. In addition to PET with high molecular weight, PET with low molecular weight, such as its oligomer (trimer), bis-hydroxyethyl Terephthalate (BHET), and methyl-(2-hydroxyethyl) Terephthalate (MHET), was used as a model reactant to clarify the depolymerization pathway of poly(ethylene Terephthalate) in supercritical methanol. The reaction products were analyzed with size-exclusion chromatography, high-performance liquid chromatography, and high-performance liquid chromatography−mass spectrometry. The main products of each reaction were the monomers, dimethyl Terephthalate (DMT) and ethylene glycol (EG). The depolymerization of high molecular we...
-
Depolymerization Mechanism of Poly(ethylene Terephthalate) in Supercritical Methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high ...
Tomoko Iwaya - One of the best experts on this subject based on the ideXlab platform.
-
depolymerization mechanism of poly ethylene Terephthalate in supercritical methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high molecular weight (IV value (intrinsic viscosity) = 0.84) was depolymerized in a batch reactor at temperatures between 543 and 573 K under estimated pressures of 0.1−15 MPa. In addition to PET with high molecular weight, PET with low molecular weight, such as its oligomer (trimer), bis-hydroxyethyl Terephthalate (BHET), and methyl-(2-hydroxyethyl) Terephthalate (MHET), was used as a model reactant to clarify the depolymerization pathway of poly(ethylene Terephthalate) in supercritical methanol. The reaction products were analyzed with size-exclusion chromatography, high-performance liquid chromatography, and high-performance liquid chromatography−mass spectrometry. The main products of each reaction were the monomers, dimethyl Terephthalate (DMT) and ethylene glycol (EG). The depolymerization of high molecular we...
-
Depolymerization Mechanism of Poly(ethylene Terephthalate) in Supercritical Methanol
Industrial & Engineering Chemistry Research, 2005Co-Authors: Minoru Genta, Tomoko Iwaya, Mitsuru Sasaki, Motonobu Goto, Tsutomu HiroseAbstract:The kinetics of poly(ethylene Terephthalate) (PET) depolymerization in supercritical methanol was investigated to develop a chemical recycling process for postconsumer PET bottles. PET with a high ...