Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/138616
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dc.contributor.authorLiu, Boen_US
dc.contributor.authorLiu, Chengyinen_US
dc.contributor.authorDe Luca, Hugo G.en_US
dc.contributor.authorRaman Pillai, Suresh Kumaren_US
dc.contributor.authorAnthony, David B.en_US
dc.contributor.authorLi, Jianghuaen_US
dc.contributor.authorBismarck, Alexanderen_US
dc.contributor.authorShaffer, Milo S. P.en_US
dc.contributor.authorChan-Park, Mary Bee Engen_US
dc.date.accessioned2020-05-11T04:30:24Z-
dc.date.available2020-05-11T04:30:24Z-
dc.date.issued2019-
dc.identifier.citationLiu, B., Liu, C., De Luca, H. G., Raman Pillai, S. K., Anthony, D. B., Li, J., . . . Chan-Park, M. B. (2019). Synthesis of epoxidized poly (ester carbonate)-b-polyimide-b-poly (ester carbonate) : reactive single-walled carbon nanotube dispersants enable synergistic reinforcement around multi-walled nanotube-grafted carbon fibers. Polymer Chemistry, 10(11), 1324-1334. doi:10.1039/C8PY01465Een_US
dc.identifier.issn1759-9954en_US
dc.identifier.urihttps://hdl.handle.net/10356/138616-
dc.description.abstractPolyimides (PI) generally have a high affinity for single-walled carbon nanotubes (SWNTs), but they suffer from poor solubility in most low boiling point organic solvents and low compatibility with common resins (such as epoxy) used in composites, limiting their suitability as dispersants. PI block copolymer systems containing reactive poly(ester carbonate)s have not yet been reported and are expected to act as effective reactive dispersing agents of SWNTs. Herein, PI-derived block copolymers are synthesized via ring-opening copolymerization of lactide (LA) (a control monomer) and allyl-bearing 2-methyl-2-(allyloxycarbonyl)-propylene carbonate (MAC) from the OH-terminal ends of the PI block to produce PLA-PI-PLA (TB1, a control) and PMAC-PI-PMAC (TB2). The allyl pendant group of TB2 allows further facile functionalization to form a third series of epoxidized (EP) derivatives, i.e. PMACEP-block-PI-block-PMACEP (TB3). TB3 copolymer when mixed with a conventional structural epoxy resin forms blends that do not show inferior tensile properties compared with the epoxy, which is unusual. Furthermore, the mixing solvent tetrahydrofuran (THF) can be readily evaporated off after forming the blends. TB3-dispersed (2 wt%) SWNTs added to epoxy increased the tensile strength, modulus, and elongation at break of the resulting nanocomposite films by 40%, 34%, and 26% respectively, compared to the baseline epoxy resin. Furthermore, when TB3b triblock-dispersed SWNTs in epoxy were combined with fuzzy carbon fibers, i.e. carbon nanotube-grafted-carbon fibers (CNT-g-CF), a synergistic interfacial strength reinforcement was observed, together with shifting of the failure mode from the matrix interphase to the carbon fiber-grafted nanotube interface. The ultimate interfacial shear strength between the TB3-dispersed SWNT-epoxy matrix and the fuzzy carbon fibers (i.e., fibers having carbon nanotubes grown on them) measured via single fiber pull-out tests was 100 MPa, which was ca. 11% improvement over the baseline unsized carbon fiber in neat epoxy. To our knowledge, this is the first evidence of a synergistic enhancement in interfacial properties when fuzzy carbon fibers are combined with a SWNT-reinforced epoxy using the new epoxidized TB3 nanotube dispersing agent that forms a strong covalent TB3–epoxy interface. The new functionalizable TB3 synthesis route introduced here is generalizable to other PI-based copolymers with diverse functionalities and solvent compatibilities.en_US
dc.description.sponsorshipASTAR (Agency for Sci., Tech. and Research, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.description.sponsorshipNMRC (Natl Medical Research Council, S’pore)en_US
dc.description.sponsorshipMOH (Min. of Health, S’pore)en_US
dc.language.isoenen_US
dc.relation.ispartofPolymer Chemistryen_US
dc.rights© 2019 The Royal Society of Chemistry. All rights reserved. This paper was published in Polymer Chemistry and is made available with permission of The Royal Society of Chemistry.en_US
dc.subjectEngineering::Chemical engineeringen_US
dc.titleSynthesis of epoxidized poly(ester carbonate)-b-polyimide-b-poly(ester carbonate) : reactive single-walled carbon nanotube dispersants enable synergistic reinforcement around multi-walled nanotube-grafted carbon fibersen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.identifier.doi10.1039/C8PY01465E-
dc.description.versionAccepted versionen_US
dc.identifier.issue11en_US
dc.identifier.volume10en_US
dc.identifier.spage1324en_US
dc.identifier.epage1334en_US
dc.subject.keywordsPolyimidesen_US
dc.subject.keywordsSingle-walled Carbon Nanotubeen_US
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