Cited by 305Polymer composites and self-healingAdvanced Materials and MechanicsPolymer crystallization and properties

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AB-polymer networks based on oligo(ɛ-caprolactone) segments showing shape-memory properties

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Lendlein, Andreas, Schmidt, Annette M., Langer, Robert·2001·Proceedings of the National Academy of Sciences

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Abstract

Although shape-memory metal alloys have wide use in medicine and other areas, improved properties, particularly easy shaping, high shape stability, and adjustable transition temperature, are realizable only by polymer systems. In this paper, a polymer system of shape-memory polymer networks based on oligo(ɛ-caprolactone) dimethacrylate as crosslinker and n -butyl acrylate as comonomer was introduced. The influence of two structural parameters, the molecular weight of oligo(ɛ-caprolactone) dimethacrylate and the weight content of n -butyl acrylate, on macroscopic properties of polymer networks such as thermal and mechanical properties has been investigated. Tensile tests above and below melting temperature showed a decrease in the elastic modulus with increasing comonomer weight content. The crystallization behavior of the new materials has been investigated, and key parameters for the programming procedure of the temporary shape have been evaluated. Shape-memory properties have been quantified by thermocyclic experiments. All samples reached uniform deformation properties with recovery rates above 99% after 3 cycles. Whereas strain recovery increased with increasing n -butyl acrylate content, strain fixity decreased, reflecting the decreasing degree of crystallinity of the material.

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Authors: Lendlein, A., Schmidt, A. M., & Langer, R.
Affiliations: Massachusetts Institute of Technology (US)
Institute for Technical and Macromolecular Chemistry, Rheinisch Westfälische Technische Hochschule (RWTH) Aachen, and German Wool Research Institute at RWTH Aachen e.V., Veltmanplatz 8, D-52062 Aachen, Germany; and Massachusetts Institute of Technology, Department of Chemical Engineering, 45 Carleton Street, Cambridge, MA 02139
ORCID: Lendlein, Andreas
Schmidt, Annette M.
Venue: Proceedings of the National Academy of Sciences
Publisher: National Academy of Sciences
Published: 2001-01-23
Volume: 98
Issue: 3
Pages: 842-847
ISSN: 0027-8424 (ISSN-L)
1091-6490
DOI: 10.1073/pnas.98.3.842
PMC: PMC14671
OpenAlex: W4240829654
Cited by: 303
References: 18
Citations by year: 2026: 2 · 2024: 5 · 2023: 9 · 2022: 3 · 2021: 9 · 2020: 13 · 2019: 18 · 2018: 12 · 2017: 15 · 2016: 20 · 2015: 13 · 2014: 16 · 2013: 5 · 2012: 23
FWCI: 7.21
Type: journal article
Language: en
Open access: green
www.ncbi.nlm.nih.gov
Locations: Proceedings of the National Academy of Sciences (publishedVersion)
Europe PMC (PubMed Central) (publishedVersion)
PubMed Central (publishedVersion)
PubMed (publishedVersion)
Topics: Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
Keywords: shape memory polymers, butyl acrylate, polymer networks, crosslinking, shape programming, crystallization behavior, strain recovery, elastic modulus, molecular weight effects

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AB-polymer networks based on oligo(ɛ-caprolactone) segments showing shape-memory properties

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