Hydrolytic Degradation Behavior of a Renewable Thermoplastic Elastomer
Abstract
The hydrolytic degradation of polylactide-polymenthide-polylactide triblock copolymers (37 degrees C, pH 7.4) is compared to that of the component homopolymers. In addition to mass loss and water uptake measurements, size exclusion chromatography (SEC), 1H NMR spectroscopy, differential scanning calorimetry (DSC), and mechanical testing were used to monitor property changes during degradation. The rate of copolymer degradation was significantly influenced by the molecular weight of the polylactide end blocks. Mass loss of the polylactide homopolymer and the copolymer samples was observed once a decrease in the total molecular weight of the samples of 20% occurred. 1H NMR spectroscopy and DSC analysis of the copolymers during degradation revealed that the released oligomers contained mostly polylactide. After initial water uptake in which the mechanical properties were compromised to an extent, the Young's modulus and elongation at break of the biorenewable copolymers remained relatively unperturbed for up to 16 weeks, with significant retention of thermoplastic elastomeric properties for up to 21 weeks.
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The high entanglement molar mass polymers Pδ5, poly(menthide), and poly(ε-decalactone) have lower modulus.
“The lower modulus of the high entanglement molar mass polymers (e.g., P δ 5 , poly(menthide), and poly( ε -decalactone)) makes them attractive for use in pressure-sensitive adhesives. 9,80 -83”
From Aliphatic Polyester Block Polymer Design (2016) · cites this paper as [9]
Cites
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- Authors
- Wanamaker, C. L., Tolman, W. B., & Hillmyer, M. A.
- Affiliations
- University of Minnesota (US)
- Corresponding author
- Tolman, William B.
- Hillmyer, Marc A.
- Venue
- Biomacromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-01-21
- Volume
- 10
- Issue
- 2
- Pages
- 443-448
- ISSN
- 1525-7797 (ISSN-L)
- 1526-4602
- OpenAlex
- W2116113612
- Cited by
- 63
- References
- 7
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 2 · 2023: 3 · 2022: 4 · 2021: 1 · 2020: 5 · 2019: 1 · 2016: 4 · 2015: 4 · 2014: 10 · 2013: 3 · 2012: 3
- FWCI
- 3.22
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biomacromolecules (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Keywords
- hydrolytic degradation, polylactic acid, triblock copolymers, thermoplastic elastomers, biodegradable polymers, water absorption, molecular weight reduction, mechanical properties, Young's modulus, elongation at break, bio-based polymers
- MeSH terms
- Hydrolysis, Materials Testing, Water, Elastomers, Mechanical Phenomena
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