In this section
@article{Williams:2015:10.1021/acs.macromol.5b01293,
author = {Williams, CK and Paul, S and Romain, C and Shaw, J},
doi = {10.1021/acs.macromol.5b01293},
journal = {Macromolecules},
pages = {6047--6056},
title = {Sequence selective polymerization catalysis: A new route to ABA block copoly(ester-b-carbonate-b-ester)},
url = {http://dx.doi.org/10.1021/acs.macromol.5b01293},
volume = {48},
year = {2015}
}
TY - JOUR
AB - The preparation of ABA type block copoly(ester-b-carbonate-b-ester) from a mixture of ε-caprolactone, cyclohexene oxide, and carbon dioxide monomers and using a single catalyst is presented. By using a dinuclear zinc catalyst, both the ring-opening polymerization of ε-caprolactone and the ring-opening copolymerization of cyclohexene oxide and carbon dioxide are achieved. The catalyst shows high selectivity, activity, and control in the ring-opening copolymerization, yielding poly(cyclohexene carbonate) polyols, i.e., α,ω-dihydroxyl end-capped polycarbonates. It also functions efficiently under immortal conditions, and in particular, the addition of various equivalents of water enables the selective preparation of polyols and control over the polymers’ molecular weights and dispersities. The catalyst is also active for the ring-opening polymerization of ε-caprolactone but only in the presence of epoxide, generating α,ω-dihydroxyl-terminated polycaprolactones. It is also possible to combine the two polymerization pathways and, by controlling the chemistry of the growing polymer chain-metal end group, to direct a particular polymerization pathway. Thus, in the presence of all three monomers, the selective ring-opening copolymerization occurs to yield poly(cyclohexene carbonate). Upon removal of the carbon dioxide, the polymerization cycle switches to ring-opening polymerization and a triblock copoly(caprolactone-b-cyclohexene carbonate-b-caprolactone) is produced. The ABA type block copolymer is fully characterized, including using various spectroscopic techniques, size exclusion chromatography, and differential scanning calorimetry. The copolymers can be solvent cast to give transparent films. The copolymers show controllable glass transition temperatures from −54 to 34 °C, which are dependent on the block compositions.
AU - Williams,CK
AU - Paul,S
AU - Romain,C
AU - Shaw,J
DO - 10.1021/acs.macromol.5b01293
EP - 6056
PY - 2015///
SN - 0024-9297
SP - 6047
TI - Sequence selective polymerization catalysis: A new route to ABA block copoly(ester-b-carbonate-b-ester)
T2 - Macromolecules
UR - http://dx.doi.org/10.1021/acs.macromol.5b01293
UR - http://hdl.handle.net/10044/1/25499
VL - 48
ER -
Climate Science
Earth and Life Sciences
Energy and Low-Carbon Futures
Resources and Pollution
Economics and Finance
Health
View all publications and browse by year
Briefing papers and Briefing notes
Grantham Institute Outlooks
Evidence & submission papers
Infographics