Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system
In order to develop a chemical recycling system of polyurethanes (PUs), environment-friendly hydrolysis of two types of aliphatic PUs was studied under pressured CO2 in water, in which the carbonic acid generated from CO2 acted as an acid catalyst. Two PUs, namely H-PU or I-PU, were synthesized star...
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Wiley Periodicals, Inc.
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ftnagasakiuniv:oai:nagasaki-u.repo.nii.ac.jp:00000970 2024-09-15T18:01:40+00:00 Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system Motokucho, Suguru Nakayama, Yu Morikawa, Hiroshi Nakatani, Hisayuki 2017-10-26 application/pdf https://nagasaki-u.repo.nii.ac.jp/record/970/files/JAPS135_45897.pdf eng eng Wiley Periodicals, Inc. 10.1002/app.45897 Journal of Applied Polymer Science, 135(8), art.no.45897; 2017 8 135 45897 00218995 https://nagasaki-u.repo.nii.ac.jp/record/970/files/JAPS135_45897.pdf c 2017 Wiley Periodicals, Inc. This is the peer reviewed version of the following article: Journal of Applied Polymer Science, 135(8), art.no.45897; 2017, which has been published in final form at https://doi.org/10.1002/app.45897. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. degradation polyurethane recycling AM 2017 ftnagasakiuniv 2024-08-23T06:19:41Z In order to develop a chemical recycling system of polyurethanes (PUs), environment-friendly hydrolysis of two types of aliphatic PUs was studied under pressured CO2 in water, in which the carbonic acid generated from CO2 acted as an acid catalyst. Two PUs, namely H-PU or I-PU, were synthesized starting from 1,4-butanediol and 1,6-hexamethylene diisocyanate or isophorone diisocyanate, respectively. The hydrolysis of PUs depended on the experimental conditions, such as the temperature and CO2 pressure. As a result, 98% of H-PU and 91% of I-PU were successfully hydrolyzed under the typical conditions of 190?°C for 24 h at 8.0 MPa CO2. The reaction mixtures afforded 1,4-butanediol and diamines without the formation of any byproducts. Both of these raw materials generated from the originated PUs by selective hydrolytic cleavage of the urethane linkages, and they were easily isolated in high yields simply by evaporation of the water-soluble components within the reaction mixture. By comparing the results of the two aliphatic PUs with those of an aromatic PU (M-PU), the hydrolyzability was found to decrease in the order H-PU, I-PU, and M-PU. The difference can be ascribed to the hydrophilicity of the aliphatic or aromatic groups connected to the urethane moieties at the terminals of PUs. Journal of Applied Polymer Science journal article Other/Unknown Material Carbonic acid NAOSITE: Nagasaki University Academic Output SITE |
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NAOSITE: Nagasaki University Academic Output SITE |
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English |
topic |
degradation polyurethane recycling |
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degradation polyurethane recycling Motokucho, Suguru Nakayama, Yu Morikawa, Hiroshi Nakatani, Hisayuki Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system |
topic_facet |
degradation polyurethane recycling |
description |
In order to develop a chemical recycling system of polyurethanes (PUs), environment-friendly hydrolysis of two types of aliphatic PUs was studied under pressured CO2 in water, in which the carbonic acid generated from CO2 acted as an acid catalyst. Two PUs, namely H-PU or I-PU, were synthesized starting from 1,4-butanediol and 1,6-hexamethylene diisocyanate or isophorone diisocyanate, respectively. The hydrolysis of PUs depended on the experimental conditions, such as the temperature and CO2 pressure. As a result, 98% of H-PU and 91% of I-PU were successfully hydrolyzed under the typical conditions of 190?°C for 24 h at 8.0 MPa CO2. The reaction mixtures afforded 1,4-butanediol and diamines without the formation of any byproducts. Both of these raw materials generated from the originated PUs by selective hydrolytic cleavage of the urethane linkages, and they were easily isolated in high yields simply by evaporation of the water-soluble components within the reaction mixture. By comparing the results of the two aliphatic PUs with those of an aromatic PU (M-PU), the hydrolyzability was found to decrease in the order H-PU, I-PU, and M-PU. The difference can be ascribed to the hydrophilicity of the aliphatic or aromatic groups connected to the urethane moieties at the terminals of PUs. Journal of Applied Polymer Science journal article |
format |
Other/Unknown Material |
author |
Motokucho, Suguru Nakayama, Yu Morikawa, Hiroshi Nakatani, Hisayuki |
author_facet |
Motokucho, Suguru Nakayama, Yu Morikawa, Hiroshi Nakatani, Hisayuki |
author_sort |
Motokucho, Suguru |
title |
Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system |
title_short |
Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system |
title_full |
Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system |
title_fullStr |
Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system |
title_full_unstemmed |
Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system |
title_sort |
environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a co2-water system |
publisher |
Wiley Periodicals, Inc. |
publishDate |
2017 |
url |
https://nagasaki-u.repo.nii.ac.jp/record/970/files/JAPS135_45897.pdf |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
10.1002/app.45897 Journal of Applied Polymer Science, 135(8), art.no.45897; 2017 8 135 45897 00218995 https://nagasaki-u.repo.nii.ac.jp/record/970/files/JAPS135_45897.pdf |
op_rights |
c 2017 Wiley Periodicals, Inc. This is the peer reviewed version of the following article: Journal of Applied Polymer Science, 135(8), art.no.45897; 2017, which has been published in final form at https://doi.org/10.1002/app.45897. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
_version_ |
1810438761856630784 |