Role of PEG Segment in Stereocomplex Crystallization for PLLA/PDLA-b-PEG-b-PDLA Blends
Abstract
The isothermal crystallization behavior and morphology of neat poly( l -lactic acid) (PLLA) and its blends with poly( d -lactic acid) (PDLA) and PDLA- b -poly(ethylene glycol) (PEG)- b -PDLA have been investigated. The glass transition temperature of the PLLA/PDLA blend, and especially the PLLA/PDLA- b -PEG- b -PDLA blend, is much lower than that of neat PLLA, indicating the plasticization effect of both low molecular weight PDLA and flexible PEG block. Both the PLLA/PDLA and PLLA/PDLA- b -PEG- b -PDLA blends can form stereocomplex (SC) crystals. However, the PDLA in the PLLA/PDLA blend postponed the crystallization rate of the blend, whereas the PEG chains in PLLA/PDLA- b -PEG- b -PDLA not only promoted the formation of SC crystals but also facilitated the crystallization of the PLLA matrix. The evolution of the crystal structure and morphologies of PLLA and its blends during the isothermal crystallization process have revealed the significant role of flexible PEG chains in the stereocomplex crystallization.
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WAXD diffraction peaks at 2θ ≈ 11.9°, 20.6°, and 23.8° correspond to the (110), (300)/(030), and (220) planes of SC crystals.
“the diffraction peaks at 2θ ≈ 11.9°, 20.6°, and 23.8° correspond to the (110), (300)/(030), and (220) planes of the SC crystals, respectively [23].”
The PLLA/PCL multi-block copolymer exhibits a duality for the crystallization of sc-PLA: the PCL block acts as a plasticizer limiting polymer crystallization, while the soft PCL block promotes movement of PLLA and PDLA chains conducive to their alternating arrangement to produce stereocomplex crystallization.
“These results reveal that the PLLA/PCL multi-block copolymer exhibits the duality for the crystallization of sc-PLA.”
From Crystallization, thermal and mechanical properties of stereocomplexed poly(lactide) with flexible PLLA/PCL multiblock copolymer (2022) · cites this paper as [41]
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References 32 · Cited by 59
- Authors
- Song, Y., Wang, D., Jiang, N., & Gan, Z.
- Affiliations
- Chinese Academy of Sciences (CN)
- State Key Laboratory of Organic-Inorganic Composite Materials (CN)
- Corresponding author
- Jiang, Ni
- Gan, Zhihua
- Venue
- ACS Sustainable Chemistry & Engineering
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-06-10
- Volume
- 3
- Issue
- 7
- Pages
- 1492-1500
- ISSN
- 2168-0485 (ISSN-L)
- OpenAlex
- W2338238000
- Cited by
- 59
- References
- 32
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 5 · 2023: 7 · 2022: 6 · 2021: 2 · 2020: 4 · 2019: 8 · 2018: 4 · 2017: 8 · 2016: 8 · 2015: 1
- FWCI
- 4.49
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ACS Sustainable Chemistry & Engineering (publishedVersion)
- Funders
- National Natural Science Foundation of China (21104089, 51025314)
- 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
- stereocomplex crystallization, poly(L-lactic acid), poly(D-lactide), poly(ethylene glycol) block copolymers, PLLA/PDLA blends, isothermal crystallization, plasticization, glass transition temperature, crystallization rate, crystal morphology
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