Loading...
Enhancing poly(lactic acid) microcellular foams by formation of distinctive crystalline structures
Li, R. Ye, L. Zhao, X. Coates, Philip D. Caton-Rose, Philip D.
Li, R.
Ye, L.
Zhao, X.
Coates, Philip D.
Caton-Rose, Philip D.
Publication Date
2020-04
End of Embargo
Supervisor
Rights
© 2020 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial & Engineering Chemistry Research, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.iecr.0c00537.
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2020-03-30
Institution
Department
Awarded
Embargo end date
Additional title
Abstract
By controlling the crystallization behavior of poly(lactic acid) (PLA) in the presence of a hydrazide nucleating agent (HNA), PLA-HNA foams with enhanced microcellular structures were prepared via supercritical CO2 foaming. It was found that HNA can self-assemble into fibrillar networks, inducing the crystallization of PLA on their surface, and "shish-kebab"crystalline structures with high crystallinity formed, which can be maintained during the whole foaming process. Incorporation of HNA promoted the formation of gt conformers, improved the amount of dissolved CO2, hindered the escape of CO2, and increased the viscoelasticity of PLA. Compared with neat PLA foam, for PLA-HNA foam, the average cell diameter decreased obviously, from 64.39 to 6.59 μm, while the cell density increased up to nearly three orders of magnitudes, from 6.82 × 106 to 4.44 × 109 cells/cm3. Moreover, lots of fibrillar structures appeared and entangled with each other on the cell wall of the foam. By forming such dense micropores and enhanced fibrillar structures, PLA foam was highly reinforced with significantly improved compressive strength.
Version
Accepted manuscript
Citation
Li R, Ye L, Zhao X et al (2020) Enhancing poly(lactic acid) microcellular foams by formation of distinctive crystalline structures. Industrial & Engineering Chemistry Research. 59(16): 7624-7632.
Link to publisher’s version
Link to published version
Link to Version of Record
Type
Article