Two-way multi-shape memory properties of peroxide crosslinked ethylene vinyl-acetate copolymer (EVA)/polycaprolactone (PCL) blends
Abstract
Rare studies have investigated on the 2‐way shape memory crosslinked blends with multiple shape memory behavior up to date. To consider the merit of commercial cost‐competitive crystalline polymers, ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends (60/40 and 30/70) were peroxide‐cured to form the 2‐way multi‐shape memory crosslinked blends using a melt‐blending method. Both resins were selected to have a similar controlled crosslinking degree, which allowed us to distinctly evaluate their actuation contributions from the cooling‐induced elongation (crystallization) and from the entropy‐driven elongation during cooling process, respectively. In the 2‐way process for the 60/40 system, 2 respective peaks contributed from the cooling‐induced crystallization of EVA and PCL in the cooling curves based on the strain derivate rates at various temperatures were observed. After the cooling process under the loading stress of 150 kPa, the 2‐step heating‐induced contraction process with increasing temperature started at 54.1°C above the melting temperature of PCL at 52.3°C and EVA at 78.3°C, demonstrating 2‐way multi‐shape memory behavior. The multi‐step behavior was more prominent at higher PCL composition and higher load for the 30/70 system. It was found that the entropy‐driven contribution to the overall actuation magnitude increased with increasing nominal loads due to the increased orientation of molecular networks in the blends. The current approach offers numerous possibilities in preparing 2‐way multi‐shape memory crosslinked blends.
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The two-way SME under constant stress approach was extended to triple SMPs, where a reversible SME was shown over two transition temperatures, with reversible switching between three shapes under applied stress.
“The approach was even extended to triple SMPs in [114-117], where a reversible SME was shown over two transition temperatures, with a reversible switching between three shapes under an applied stress.”
From Two-Way and Multiple-Way Shape Memory Polymers for Soft Robotics: An Overview (2020) · cites this paper as [115]
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- Authors
- Han, J., Lai, S., & Chiu, Y. T.
- Affiliations
- National Ilan University (TW)
- Corresponding author
- Lai, Sun‐Mou
- Venue
- Polymers for Advanced Technologies
- Publisher
- Wiley
- Published
- 2018-05
- Volume
- 29
- Issue
- 7
- Pages
- 2010-2024
- ISSN
- 1042-7147 (ISSN-L)
- 1099-1581
- OpenAlex
- W2802632488
- Cited by
- 34
- References
- 43
- Citations by year
- 2025: 3 · 2024: 3 · 2023: 4 · 2022: 4 · 2021: 4 · 2020: 7 · 2019: 7 · 2018: 2
- FWCI
- 3.19
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Polymers for Advanced Technologies (publishedVersion)
- Funders
- ROC government (MOST 103-2221-E-197-030)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Keywords
- two-way shape memory effect, ethylene vinyl acetate, polycaprolactone, peroxide crosslinking, blend composition
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