Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control
Polymerization of 1,2-cyclohexene oxide (CHO) in dichloromethane was catalyzed by 12-tungstophosphoric acid (H3PW12O40·13H2O) as a super solid acid. The effect of polymerization parameters such as reaction time, temperature, and...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2015/826512 |
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| author | Ahmed Aouissi Zeid Abdullah Al-Othman Abdurrahman Salhabi |
| author_facet | Ahmed Aouissi Zeid Abdullah Al-Othman Abdurrahman Salhabi |
| author_sort | Ahmed Aouissi |
| collection | DOAJ |
| description | Polymerization of 1,2-cyclohexene oxide (CHO) in
dichloromethane was catalyzed by 12-tungstophosphoric
acid
(H3PW12O40·13H2O)
as a super solid acid. The effect of polymerization
parameters such as reaction time, temperature, and
catalyst amount was investigated. The effect of acetic
anhydride as a ring-opening agent was also
investigated. The resulting poly(1,2-cyclohexene oxide) (PCHO) was characterized by Fourier transform
infrared (FTIR), nuclear magnetic resonance
spectroscopy (1HNMR), gel-permeation
chromatography (GPC), and differential scanning
calorimetry (DSC). It has been found that the PCHO
prepared over
H3PW12O40·13H2O
has a stereoregularity higher than that prepared over
clay and Aluminium alkoxide catalysts. The Tg value obtained is due to the
microstructure but not to molecular weight. The
yield and the molecular weight of the polymer
depend strongly on the reaction conditions.
Molecular weights can be readily controlled by
changing reaction temperature, reaction time, and
catalyst amount. Contrary to most polymerization
reactions, the molecular weight increases with the
temperature increase. Addition of acetic anhydride
to the reaction medium increased the yield
threefold. |
| format | Article |
| id | doaj-art-fdf58223d52144acb7f99c2584e2fb52 |
| institution | Kabale University |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-fdf58223d52144acb7f99c2584e2fb522025-02-03T05:58:43ZengWileyInternational Journal of Polymer Science1687-94221687-94302015-01-01201510.1155/2015/826512826512Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight ControlAhmed Aouissi0Zeid Abdullah Al-Othman1Abdurrahman Salhabi2Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaDepartment of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaKing Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi ArabiaPolymerization of 1,2-cyclohexene oxide (CHO) in dichloromethane was catalyzed by 12-tungstophosphoric acid (H3PW12O40·13H2O) as a super solid acid. The effect of polymerization parameters such as reaction time, temperature, and catalyst amount was investigated. The effect of acetic anhydride as a ring-opening agent was also investigated. The resulting poly(1,2-cyclohexene oxide) (PCHO) was characterized by Fourier transform infrared (FTIR), nuclear magnetic resonance spectroscopy (1HNMR), gel-permeation chromatography (GPC), and differential scanning calorimetry (DSC). It has been found that the PCHO prepared over H3PW12O40·13H2O has a stereoregularity higher than that prepared over clay and Aluminium alkoxide catalysts. The Tg value obtained is due to the microstructure but not to molecular weight. The yield and the molecular weight of the polymer depend strongly on the reaction conditions. Molecular weights can be readily controlled by changing reaction temperature, reaction time, and catalyst amount. Contrary to most polymerization reactions, the molecular weight increases with the temperature increase. Addition of acetic anhydride to the reaction medium increased the yield threefold.http://dx.doi.org/10.1155/2015/826512 |
| spellingShingle | Ahmed Aouissi Zeid Abdullah Al-Othman Abdurrahman Salhabi Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control International Journal of Polymer Science |
| title | Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control |
| title_full | Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control |
| title_fullStr | Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control |
| title_full_unstemmed | Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control |
| title_short | Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control |
| title_sort | keggin type heteropolyacid for ring opening polymerization of cyclohexene oxide molecular weight control |
| url | http://dx.doi.org/10.1155/2015/826512 |
| work_keys_str_mv | AT ahmedaouissi keggintypeheteropolyacidforringopeningpolymerizationofcyclohexeneoxidemolecularweightcontrol AT zeidabdullahalothman keggintypeheteropolyacidforringopeningpolymerizationofcyclohexeneoxidemolecularweightcontrol AT abdurrahmansalhabi keggintypeheteropolyacidforringopeningpolymerizationofcyclohexeneoxidemolecularweightcontrol |