Macromolecules, volume 45, issue 15, pages 5916-5922
Depolymerization of Polycarbonates Derived from Carbon Dioxide and Epoxides to Provide Cyclic Carbonates. A Kinetic Study
Publication type: Journal Article
Publication date: 2012-07-17
Materials Chemistry
Organic Chemistry
Inorganic Chemistry
Polymers and Plastics
Abstract
The depolymerization reactions of several polycarbonates produced from the completely alternating copolymerization of epoxides and carbon dioxide have been investigated. The aliphatic polycarbonates derived from styrene oxide, epichlorohydrin, or propylene oxide and CO2 were found to undergo quantitative conversion to the corresponding cyclic carbonate following deprotonation of their −OH end group by azide ion. The process was shown to involve the unzipping of the copolymer in a backbiting fashion leading to a steady decrease in the copolymer’s molecular weight while maintaining its narrow molecular weight distribution. This pathway for depolymerization was further supported by the observation that upon end-capping the copolymer with an acetate group, it was stabilized. Temperature-dependent kinetic studies provided energy of activation (Ea) barriers for cyclic carbonate formation which increased in the order: poly(styrene carbonate) (46.7 kJ/mol) < poly(CO2-alt-epichlorohydrin) (76.2 kJ/mol) ≤ poly(prop...
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Darensbourg D. J., Wei S. H. Depolymerization of Polycarbonates Derived from Carbon Dioxide and Epoxides to Provide Cyclic Carbonates. A Kinetic Study // Macromolecules. 2012. Vol. 45. No. 15. pp. 5916-5922.
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Darensbourg D. J., Wei S. H. Depolymerization of Polycarbonates Derived from Carbon Dioxide and Epoxides to Provide Cyclic Carbonates. A Kinetic Study // Macromolecules. 2012. Vol. 45. No. 15. pp. 5916-5922.
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TY - JOUR
DO - 10.1021/ma301110c
UR - https://doi.org/10.1021/ma301110c
TI - Depolymerization of Polycarbonates Derived from Carbon Dioxide and Epoxides to Provide Cyclic Carbonates. A Kinetic Study
T2 - Macromolecules
AU - Darensbourg, Donald J.
AU - Wei, Sheng Hsuan
PY - 2012
DA - 2012/07/17
PB - American Chemical Society (ACS)
SP - 5916-5922
IS - 15
VL - 45
SN - 0024-9297
SN - 1520-5835
ER -
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BibTex (up to 50 authors)
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@article{2012_Darensbourg,
author = {Donald J. Darensbourg and Sheng Hsuan Wei},
title = {Depolymerization of Polycarbonates Derived from Carbon Dioxide and Epoxides to Provide Cyclic Carbonates. A Kinetic Study},
journal = {Macromolecules},
year = {2012},
volume = {45},
publisher = {American Chemical Society (ACS)},
month = {jul},
url = {https://doi.org/10.1021/ma301110c},
number = {15},
pages = {5916--5922},
doi = {10.1021/ma301110c}
}
Cite this
MLA
Copy
Darensbourg, Donald J., and Sheng Hsuan Wei. “Depolymerization of Polycarbonates Derived from Carbon Dioxide and Epoxides to Provide Cyclic Carbonates. A Kinetic Study.” Macromolecules, vol. 45, no. 15, Jul. 2012, pp. 5916-5922. https://doi.org/10.1021/ma301110c.