Cited by 79Polymer composites and self-healingAdvanced Materials and MechanicsHydrogels: synthesis, properties, applications

High-strain shape memory polymer networks crosslinked by SiO2

Zhang, Yaoming, Wang, Qihua, Wang, Chao, Wang, Tingmei·2011·Journal of Materials Chemistry

Abstract

We addressed a novel high-strain shape memory polymer network constructed from SiO2 microspheres core functionalized with polycaprolactone arms. Using abundant surface hydroxyl of silica, epsilon-caprolactone was initiated and uniform SiO2@PCL macroparticles were formed; after cross-linking of SiO2@PCL by MDI, a high-strain shape memory polymer network of SiO2–SMP was obtained. Compared to traditional SMP having similar composition, the SiO2–SMP exhibits excellent mechanical strength and good shape memory properties due to the introduction of SiO2 as a cross-linking point. The elastic moduli (E) and tensile strength (σm) of the SiO2–SMP were improved to 500 MPa and 90 MPa, respectively, at room temperature. It could be attributed to the enhancement of the combining force among polymer chains caused by the crosslinking networks, and the rigidity of the polymer owing to the addition of SiO2 as filler. High shape fixing ratios (∼100%) and recovery ratios (more than 95%) were also exhibited for SiO2–SMP from the second circle. The comparatively low recovery ratios were exhibited in the first circle; the obvious evidence of the existence of the irreversible bond breakage is attributed to it. Furthermore, the mechanical and shape memory properties could be adjusted by changing the size of silica microspheres and the molecular weight of the PCL.

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Crossref · 10.1039/c1jm11022e

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  • Recent research showed some positive effect of celite particles on the shape memory effect of shape memory polymers.

    “Recent research showed some positive effect of celite particles on the SME of SMPs.”
  • Compared to traditional silica-based filler-filled SMPs, the SiO2/SMP exhibited excellent mechanical strength, high strain and good shape memory properties due to the introduction of SiO2 as a cross-linking agent.

    “Compared to traditional silica-based filler-filled SMPs, the SiO 2 /SMP exhibited excellent mechanical strength, high strain and good shape memory properties due to the introduction of SiO 2 as a cross-linking agent.”
  • SiC and SiO2 particles were previously used as cross-linking agents after surface modification with PCL or coupling with SMPU chains.

    “This structures were previously used as cross-linking agent after their surface modification with PCL [195] or coupling with SMPU chains [196].”

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Authors
Zhang, Y., Wang, Q., Wang, C., & Wang, T.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
Wang, Qihua
Venue
Journal of Materials Chemistry
Published
2011
Volume
21
Issue
25
Pages
9073
ISSN
  • 0959-9428 (ISSN-L)
  • 1364-5501
OpenAlex
W2068710666
Cited by
79
References
29
Citations by year
2025: 2 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 5 · 2020: 5 · 2019: 10 · 2018: 8 · 2017: 8 · 2016: 8 · 2015: 9 · 2014: 8 · 2013: 8 · 2012: 4
FWCI
5.46
Type
journal article
Language
en
Open access
closed
Locations
Journal of Materials Chemistry (publishedVersion)
Funders
National Natural Science Foundation of China
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
  • Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Hydrogels: synthesis, properties, applications
Keywords
silica microspheres, polycaprolactone, shape recovery ratio, mechanical properties, filler reinforcement

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