Remarkable melting behavior of PLA stereocomplex in linear PLLA/PDLA blends
Abstract
The linear PLLA/PDLA blends were prepared by solution mixing method, and the melting behavior and structure evolution of neat PLLA and PLLA/PDLA specimens were investigated in this study. Results indicated that PLA stereocomplex crystallites (sc) preferentially formed in all blends, and the crystal structure of PLA sc and homochiral crystallites (hc) did not vary as molecular weights. The melting temperature of PLA neat specimens ( T hm ) increased monotonously with molecular weights. However, significantly different from the neat samples, the melting temperature of PLA sc ( T sc ) increased at first, then decreased as the molecular weight of polymers increased from 4 to 100 kg/mol. When the molecular weights of PLLA and PDLA ranged from 23 to 50 kg/mol, multimelting behaviors observed at 230 °C in the blends. After annealing at a fix temperature ( T sc – 10 °C), the highest T sc was observed at 249.9 °C in L32/D31 specimen, which was the highest report value until now. The WAXD and SAXS results attested that not crystal structure, but the variation of the thickness of lamellar crystal was the exterior reason, and the higher optical purity of PLLA and PDLA would be the inherent cause which resulted in the superior thermal properties. This investigation provides more potential for the application of PLA sc materials at higher temperature environments.
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WAXD diffraction peaks at 2θ ≈ 12.5°, 14.9°, 16.9°, 19.3°, and 22.3° correspond to α-form PLLA crystals and were observed in all samples.
“The diffraction peaks at 2θ ≈ 12.5°, 14.9°, 16.9°, 19.3°, and 22.3°, which correspond to the (103), (010), (200)/(110), (203), and (210) planes of the α-form crystals of PLLA [22], could be observed in all the samples.”
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“3◦, which correspond to the (103), (010), (200)/(110), (203), and (210) planes of the α-form crystals of PLLA [22], could be observed in all the samples.”
BackgroundMandlule, A., Liu, Y., Schwanz, S., Pieper, Y., Scharf, H., Iskhakova, K., Conceição, A. L. C., Wieland, D. C. F., Zeller-Plumhoff, B., Toma, F. M., et al. (2026) · Materials Advances · doi:10.1039/d5ma00886g · Cited by 6 · see citing works
- Authors
- Shao, J., Xiang, S., Bian, X., Sun, J., Li, G., & Chen, X.
- Affiliations
- Chinese Academy of Sciences (CN)
- Corresponding author
- Li, Gao
- Chen, Xuesi
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-02-17
- Volume
- 54
- Issue
- 7
- Pages
- 2246-2253
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W2333551134
- Cited by
- 113
- References
- 34
- Citations by year
- 2026: 5 · 2025: 7 · 2024: 13 · 2023: 16 · 2022: 11 · 2021: 6 · 2020: 12 · 2019: 12 · 2018: 15 · 2017: 6 · 2016: 4 · 2015: 6
- FWCI
- 6.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Funders
- Ministry of Science and Technology of the People's Republic of China (2011AA02A202)
- National Natural Science Foundation of China (51033003, 51073154, 51273198, 51303176, 51321062, 51373169, 51403089)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
- Keywords
- PLLA/PDLA blends, melting behavior, melting point, molecular weight effects, lamellar thickness, crystal structure, optical purity, annealing, polymer blends
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