Low-Temperature Processable Degradable Polyesters
Open accessAbstract
Block copolymers composed of a low-T(g) and high-T(g) block, with suitable pressure miscibility characteristics, can be formed at low-temperature through the application of pressure. Aliphatic block copolyesters composed of poly(ε-caprolactone) derivatives and poly(L-lactide) show room temperature processability under hydraulic pressure of 34.5 MPa without polymer degradation. Mechanism of the pressure-induced flow is investigated by small-angle X-ray scattering. A scattering associated with a lamellae structure observed at ambient conditions decreases with elevating hydrostatic pressures, indicating pressure-induced phase mixing. Traces of the pressure-induced phase transition are studied by differential scanning calorimetry and X-ray diffraction. Tensile test of the block copolymers reveals that the mechanical properties can be readily controlled by changing composition, molecular weight, and chemical structure of the blocks. Among them, the hard segment PLLA fraction is the key factor to characterize the properties. Young's modulus of the block copolyesters is similar to that of polyethylene.
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PLA-b-PCL shows room temperature processability under hydraulic pressure of 34.5 MPa without polymer degradation.
“Taniguchi et al [25] revealed that PLA-b-PCL showed room temperature processability under hydraulic pressure of 34.5 MPa without polymer degradation.”
From Simultaneously Toughening and Strengthening of PLA-b-PCL Copolymer via Pressure-induced-flow Processing at Room Temperature (2018) · cites this paper as [25]
The Experimental Section (Processing of block copolymers; page not provided) confirms use of 34.5 MPa but says PCL-b-PLLA was pressed at 65 °C, not room temperature. Results and Discussion (Low-temperature processing; page not provided) explicitly says it could not be processed at 25 °C. (LLM, conf=0.94)
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Experimental — accuracy not yet measuredPrior work did not address the effect of pressure or reprocessing times on mechanical properties of PLA-b-PCL.
“However, they did not mention the effect of either pressure or reprocessing times on mechanical properties of PLA-b-PCL.”
From Simultaneously Toughening and Strengthening of PLA-b-PCL Copolymer via Pressure-induced-flow Processing at Room Temperature (2018) · cites this paper as [25]
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- Authors
- Taniguchi, I., & Lovell, N. G.
- Affiliations
- Research Institute of Innovative Technology for the Earth (JP)
- Massachusetts Institute of Technology (US)
- Corresponding author
- Taniguchi, Ikuo
- ORCID
- Taniguchi, Ikuo
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-09-14
- Volume
- 45
- Issue
- 18
- Pages
- 7420-7428
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- PMC
- PMC3468741
- OpenAlex
- W2018338001
- Cited by
- 33
- References
- 38
- Citations by year
- 2026: 4 · 2025: 8 · 2024: 3 · 2023: 4 · 2022: 3 · 2021: 3 · 2020: 1 · 2018: 2 · 2017: 1 · 2016: 3 · 2013: 1
- FWCI
- 0.13
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Macromolecules (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (5u54gm064346-10)
- National Institute of General Medical Sciences (U54-GM064346, R01GM059870)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Keywords
- block copolyesters, polycaprolactone, poly(L-lactic acid), pressure-driven flow, hydrostatic pressure, lamellar structure, pressure-induced phase transition, mechanical properties, Young's modulus, hard segment, biodegradable polyesters, block copolymers
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