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Cited by 69Polymer composites and self-healingAdvanced Materials and MechanicsPolymer crystallization and properties

Effect of soft segment crystallization and hard segment physical crosslink on shape memory function in antibacterial segmented polyurethane ionomers

Zhu, Y., Hu, J., Yeung, K.·2009·Acta Biomaterialia
DOI 10.1016/j.actbio.2009.05.014
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Abstract

Shape memory polyurethane (SMPU) ionomers containing constant 75 wt.% soft segment content were synthesized using poly(epsilon-caprolactone)diol, 4,4'-diphenylmethane diisocyanate, 1,4-butanediol and/or N,N-bis(2-hydroxyethyl)-isonicotinamide. To introduce substrate bonding antibacterial activity, pyridinium was prepared through a neutralization reaction using 1-iodooctane as neutralization agent. For the SMPU ionomer film obtained, tensile testing at 70 degrees C and dynamic mechanical analysis suggests that, at temperatures>T(ms) (the melting point of soft segments), 6.72 and 29.55 mol.% pyridinium within hard segments significantly decreased the mechanical properties such as the stress at 100% elongation (70 degrees C), the initial modulus (70 degrees C) and the elastic modulus (75-110 degrees C). Cyclic tensile investigation demonstrated that the two factors, soft segment crystallization and hard segment physical crosslink, play a very important role in shape memory function in SMPU ionomers. For the each individual specimen, the fixity ratio increased, and the recovery ratio decreased with the extension of cooling time. After sufficient cooling time, the fixity ratio of all specimens can reach a high value (approximately 95%). Owing to the disrupted physical crosslink in the sample containing 29.55 mol.% pyridinium, the crystallization rate of soft segments has less effect on shape fixity. Therefore, a high fixity ratio (93.8%) can be achieved in a short cooling time (30 s). In the control sample, the fixity ratio is only 73.7% after 30 s cooling. In addition, the admirable substrate bonding antibacterial activity of prepared SMPU ionomers was verified using standards AACTT 147 and ASTM E2149 in comparison with the control sample. The antibacterial activity of SMPU ionomers on Gram-positive bacteria (Staphylococcus aureus) is significant, and the rate of reduction of bacteria is 100%; the antibacterial activity on Gram-negative bacteria (Klebsiella pneumoniae) increases from 83.6% to 90.7% with increase in pyridinium content from 6.72 to 29.55 mol.%.

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Authors
Zhu, Y., Hu, J., & Yeung, K.
Affiliations
  • Hong Kong Polytechnic University (HK)
  • Clothing Industry Training Authority (CN)
Corresponding author
Hu, J.
ORCID
Venue
Acta Biomaterialia
Publisher
Elsevier BV
Published
2009-11
Volume
5
Issue
9
Pages
3346-3357
ISSN
1742-7061 (ISSN-L)
DOI
10.1016/j.actbio.2009.05.014
OpenAlex
W2053569604
Cited by
69
References
38
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 6 · 2019: 4 · 2018: 1 · 2017: 4 · 2016: 5 · 2015: 6 · 2014: 7 · 2013: 4 · 2012: 12
FWCI
5.89
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Acta Biomaterialia (publishedVersion)
  • PubMed (publishedVersion)
  • PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
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
soft segment crystallization, physical crosslinking, pyridinium, antibacterial activity, polycaprolactone, recovery ratio, Staphylococcus aureus, Klebsiella pneumoniae
MeSH terms
Anti-Bacterial Agents, Benzhydryl Compounds, Biocompatible Materials, Butylene Glycols, Cross-Linking Reagents, Crystallization, Hydrogen Bonding, Materials Testing, Microbial Sensitivity Tests, Niacinamide, Polyesters, Polyurethanes, Temperature, Tensile Strength, Molecular Structure, Spectroscopy, Fourier Transform Infrared, Isocyanates, Nuclear Magnetic Resonance, Biomolecular

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