Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation.
Highly selective transformation of poly[(R)-3-hydroxybutyric acid] (PHB) into trans-crotonic acid was achieved by thermal degradation using Mg compounds: MgO and Mg(OH)2 as catalysts. Through catalytic action, not only the temperature and Ea value of degradation were lowered by 40–50 °C and 11–14 kJ...
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| Language: | English English |
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Elsevier
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/15012/ http://psasir.upm.edu.my/id/eprint/15012/1/Highly%20selective%20transformation%20of%20poly.pdf |
| _version_ | 1848842558067703808 |
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| author | Ariffin, Hidayah Nishida, Haruo Shirai, Yoshihito Hassan, Mohd Ali |
| author_facet | Ariffin, Hidayah Nishida, Haruo Shirai, Yoshihito Hassan, Mohd Ali |
| author_sort | Ariffin, Hidayah |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Highly selective transformation of poly[(R)-3-hydroxybutyric acid] (PHB) into trans-crotonic acid was achieved by thermal degradation using Mg compounds: MgO and Mg(OH)2 as catalysts. Through catalytic action, not only the temperature and Ea value of degradation were lowered by 40–50 °C and 11–14 kJ mol−1, respectively, but also significant changes in the selectivity of pyrolyzates were observed. Notably, Mg(OH)2 showed nearly complete selectivity (∼100%) to trans-crotonic acid. Kinetic analysis of TG profiles revealed that the catalytic thermal degradation of PHB was initiated by some random degradation reactions, followed by the unzipping β-elimination from crotonate chain-ends as a main process. It was suggested that the Mg catalysts promote the totality of the β-elimination reactions by acting throughout the beginning and main processes, resulting in a lowering in the degradation temperature and the completely selective transformation of PHB. |
| first_indexed | 2025-11-15T08:01:02Z |
| format | Article |
| id | upm-15012 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T08:01:02Z |
| publishDate | 2010 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-150122015-10-29T08:03:16Z http://psasir.upm.edu.my/id/eprint/15012/ Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. Ariffin, Hidayah Nishida, Haruo Shirai, Yoshihito Hassan, Mohd Ali Highly selective transformation of poly[(R)-3-hydroxybutyric acid] (PHB) into trans-crotonic acid was achieved by thermal degradation using Mg compounds: MgO and Mg(OH)2 as catalysts. Through catalytic action, not only the temperature and Ea value of degradation were lowered by 40–50 °C and 11–14 kJ mol−1, respectively, but also significant changes in the selectivity of pyrolyzates were observed. Notably, Mg(OH)2 showed nearly complete selectivity (∼100%) to trans-crotonic acid. Kinetic analysis of TG profiles revealed that the catalytic thermal degradation of PHB was initiated by some random degradation reactions, followed by the unzipping β-elimination from crotonate chain-ends as a main process. It was suggested that the Mg catalysts promote the totality of the β-elimination reactions by acting throughout the beginning and main processes, resulting in a lowering in the degradation temperature and the completely selective transformation of PHB. Elsevier 2010 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/15012/1/Highly%20selective%20transformation%20of%20poly.pdf Ariffin, Hidayah and Nishida, Haruo and Shirai, Yoshihito and Hassan, Mohd Ali (2010) Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. Polymer Degradation and Stability, 95 (8). pp. 1375-1381. ISSN 0141-3910; ESSN: ESSN: 1873-2321 10.1016/j.polymdegradstab.2010.01.018 English |
| spellingShingle | Ariffin, Hidayah Nishida, Haruo Shirai, Yoshihito Hassan, Mohd Ali Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| title | Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| title_full | Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| title_fullStr | Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| title_full_unstemmed | Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| title_short | Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| title_sort | highly selective transformation of poly[(r)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. |
| url | http://psasir.upm.edu.my/id/eprint/15012/ http://psasir.upm.edu.my/id/eprint/15012/ http://psasir.upm.edu.my/id/eprint/15012/1/Highly%20selective%20transformation%20of%20poly.pdf |