The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.
Temperature-Variable FTIR and Solid-State 13C NMR Investigations on Crystalline Structure and Molecular Dynamics of Polymorphic Poly(l-lactide) and Poly(l-lactide)/Poly(d-lactide) Stereocomplex
Abstract
Crystalline structure and molecular dynamics in α and α′ crystals of poly( l -lactide) (PLLA) and PLLA/poly( d -lactide) (PDLA) stereocomplex (sc) crystals have been investigated by the temperature-variable FTIR and solid-state 13 C CP-MAS NMR spectroscopy. The crystal forms of polylactide (PLA) have different band frequencies, correlation field splittings in FTIR spectra and different line shapes, and resonance splittings in solid-state NMR spectra, which become more distinct with cooling to the cryogenic conditions. The well-resolved splittings in NMR resonances of α crystals, attributable to the crystallographically inequivalent sites within crystal unit cell, are considered to be due to the dipolar interactions related to the carbonyl, methyl, and methine groups. The splittings in FTIR bands and NMR resonances are absent in α′ crystals, indicating the disordered conformation and loose molecular lateral packing within their crystal lattices. The significant FTIR frequency shifts of ν(C═O), ν(CH 3 ), and ν(CH) modes during stereocomplex crystallization of PLLA/PDLA blend and the appearance of spectral splittings at cryogenic conditions suggest the coexistence of weak C–H···O═C hydrogen bonds and dipolar interactions between PLLA and PDLA chains in the sc crystals of PLA. Below the glass transition temperature ( T g ), the spin–lattice relaxation times of PLA with different crystalline structures increase in the order of amorphous ≈ α′ < α < sc.
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Cites
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Self-citationPolymorphism and isomorphism in biodegradable polyesters
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Self-citationHelix Distortion and Crystal Structure of the α-Form of Poly(l-lactide)
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Influence of crystal polymorphism on mechanical and barrier properties of poly(l-lactic acid)
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Cited by
Poly(lactic acid) stereocomplexes: A decade of progress
Tsuji, H. (2016) · Advanced Drug Delivery Reviews · doi:10.1016/j.addr.2016.04.017 · Cited by 535
Pan, P., Han, L., Bao, J., Xie, Q., Shan, G., & Bao, Y. (2015) · The Journal of Physical Chemistry B · doi:10.1021/acs.jpcb.5b03546 · Cited by 231
Self-citationZheng, Y., & Pan, P. (2020) · Progress in Polymer Science · doi:10.1016/j.progpolymsci.2020.101291 · Cited by 229
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Crystal polymorphism of polylactide and its composites by X-ray diffraction study
Hsieh, Y.-T., Nozaki, S., Kido, M., Kamitani, K., Kojio, K., & Takahara, A. (2020) · Polymer Journal · doi:10.1038/s41428-020-0343-8 · Cited by 84
Poly(lactic acid) stereocomplexes based molecular architectures: Synthesis and crystallization
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Metadata
- Authors
- Pan, P., Yang, J., Shan, G., Bao, Y., Weng, Z., Cao, A., Yazawa, K., & Inoue, Y.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-12-19
- Volume
- 45
- Issue
- 1
- Pages
- 189-197
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W1984373658
- Cited by
- 263
- References
- 6
- FWCI
- 5.18
- Type
- journal article
- Language
- en
- Open access
- closed
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