Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB
The degradation of poly(3-hydroxybutyrate)s in homo and heterogeneous mixtures with selected salts of organic and mineral acids was investigated. Nonvolatile degradation products, of processes conducted at moderate temperatures (150–170 C), were analyzed using 1H NMR. Analysis of results revealed a...
Published in: | Journal of Polymer Science Part A: Polymer Chemistry |
---|---|
Main Authors: | , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2010
|
Subjects: | |
Online Access: | http://hdl.handle.net/11585/93307 https://doi.org/10.1002/pola.24357 |
id |
ftunibolognairis:oai:cris.unibo.it:11585/93307 |
---|---|
record_format |
openpolar |
spelling |
ftunibolognairis:oai:cris.unibo.it:11585/93307 2024-02-11T10:02:51+01:00 Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB M. Kawalec M. Sobota M. Kowalczuk P. Kurcok SCANDOLA, MARIASTELLA M. Kawalec M. Sobota M. Scandola M. Kowalczuk P. Kurcok 2010 STAMPA http://hdl.handle.net/11585/93307 https://doi.org/10.1002/pola.24357 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000284225500025 volume:48 firstpage:5490 lastpage:5497 numberofpages:8 journal:JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY http://hdl.handle.net/11585/93307 doi:10.1002/pola.24357 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-78349272472 CONTROLLED DEGRADATION BRONSTED BASES ELIMINATION REACTION E1CB PHA info:eu-repo/semantics/article 2010 ftunibolognairis https://doi.org/10.1002/pola.24357 2024-01-24T17:49:38Z The degradation of poly(3-hydroxybutyrate)s in homo and heterogeneous mixtures with selected salts of organic and mineral acids was investigated. Nonvolatile degradation products, of processes conducted at moderate temperatures (150–170 C), were analyzed using 1H NMR. Analysis of results revealed a significant decrease in poly([R]-3-hydroxybutyrate) (PHB) thermal stability in the presence of acetic acid and carbonic acid salts of alkali metals (Cs, K, Li) as well as a less substantial effect with respect to bivalent metal (Ca, Mg, Zn) salts. This significant decrease in PHB thermal stability in the presence of salts of weak Bronsted-Lowry acids can be explained in terms of an anionic degradation reaction proceeding via an E1cB mechanism. Furthermore, continuous poly(3-hydroxybutyrate) controlled degradation was developed by a moderate-temperature process using carbonic acid salts as ‘‘initiators’’ of anionic degradation. Foamed PHB macromonomers, bearing one crotonate terminal group, were obtainable via a reactive extrusion process Article in Journal/Newspaper Carbonic acid IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Lowry ENVELOPE(-64.150,-64.150,-84.550,-84.550) Journal of Polymer Science Part A: Polymer Chemistry 48 23 5490 5497 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
CONTROLLED DEGRADATION BRONSTED BASES ELIMINATION REACTION E1CB PHA |
spellingShingle |
CONTROLLED DEGRADATION BRONSTED BASES ELIMINATION REACTION E1CB PHA M. Kawalec M. Sobota M. Kowalczuk P. Kurcok SCANDOLA, MARIASTELLA Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB |
topic_facet |
CONTROLLED DEGRADATION BRONSTED BASES ELIMINATION REACTION E1CB PHA |
description |
The degradation of poly(3-hydroxybutyrate)s in homo and heterogeneous mixtures with selected salts of organic and mineral acids was investigated. Nonvolatile degradation products, of processes conducted at moderate temperatures (150–170 C), were analyzed using 1H NMR. Analysis of results revealed a significant decrease in poly([R]-3-hydroxybutyrate) (PHB) thermal stability in the presence of acetic acid and carbonic acid salts of alkali metals (Cs, K, Li) as well as a less substantial effect with respect to bivalent metal (Ca, Mg, Zn) salts. This significant decrease in PHB thermal stability in the presence of salts of weak Bronsted-Lowry acids can be explained in terms of an anionic degradation reaction proceeding via an E1cB mechanism. Furthermore, continuous poly(3-hydroxybutyrate) controlled degradation was developed by a moderate-temperature process using carbonic acid salts as ‘‘initiators’’ of anionic degradation. Foamed PHB macromonomers, bearing one crotonate terminal group, were obtainable via a reactive extrusion process |
author2 |
M. Kawalec M. Sobota M. Scandola M. Kowalczuk P. Kurcok |
format |
Article in Journal/Newspaper |
author |
M. Kawalec M. Sobota M. Kowalczuk P. Kurcok SCANDOLA, MARIASTELLA |
author_facet |
M. Kawalec M. Sobota M. Kowalczuk P. Kurcok SCANDOLA, MARIASTELLA |
author_sort |
M. Kawalec |
title |
Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB |
title_short |
Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB |
title_full |
Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB |
title_fullStr |
Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB |
title_full_unstemmed |
Convenient route to PHB macromonomers via anionically controlled moderate-temperature degradation of PHB |
title_sort |
convenient route to phb macromonomers via anionically controlled moderate-temperature degradation of phb |
publishDate |
2010 |
url |
http://hdl.handle.net/11585/93307 https://doi.org/10.1002/pola.24357 |
long_lat |
ENVELOPE(-64.150,-64.150,-84.550,-84.550) |
geographic |
Lowry |
geographic_facet |
Lowry |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000284225500025 volume:48 firstpage:5490 lastpage:5497 numberofpages:8 journal:JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY http://hdl.handle.net/11585/93307 doi:10.1002/pola.24357 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-78349272472 |
op_doi |
https://doi.org/10.1002/pola.24357 |
container_title |
Journal of Polymer Science Part A: Polymer Chemistry |
container_volume |
48 |
container_issue |
23 |
container_start_page |
5490 |
op_container_end_page |
5497 |
_version_ |
1790598943021727744 |