Next Article in Journal
Solid-State Reactions for the Storage of Thermal Energy
Previous Article in Journal
Diagnosis in a Preclinical Model of Bladder Pain Syndrome Using a Au/ZnO Nanorod-based SERS Substrate
Previous Article in Special Issue
Differential Cytotoxicity of Different Sizes of Graphene Oxide Nanoparticles in Leydig (TM3) and Sertoli (TM4) Cells
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Nanomaterials 2019, 9(2), 225;

Shape Memory Polyurethane Biocomposites Based on Toughened Polycaprolactone Promoted by Nano-Chitosan

Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Korea
Author to whom correspondence should be addressed.
Received: 17 January 2019 / Revised: 31 January 2019 / Accepted: 4 February 2019 / Published: 7 February 2019
(This article belongs to the Special Issue Soft, Biological and Composite Nanomaterials)
Full-Text   |   PDF [7535 KB, uploaded 18 February 2019]   |  
  |   Review Reports


The distinctive ability to remember their original form after partial or complete deformation makes shape memory polymers remarkable materials for several engineering and biomedical applications. In the present work, the development of a polycaprolactone based toughened shape memory polyurethane biocomposite promoted by in situ incorporation of chitosan flakes has been demonstrated. The chitosan flakes were homogeneously present in the polymer matrix in the form of nanoflakes, as confirmed by the electron microscopic analysis and probably developed a crosslinked node that promoted toughness (a > 500% elongation at break) and led to a ~130% increment in ultimate tensile strength, as analyzed using a universal testing machine. During a tensile pull, X-ray analysis revealed the development of crystallites, which resulted from a stress induced crystallization process that may retain the shape and melting of the crystallites stimulating shape recovery (with a ~100% shape recovery ratio), even after permanent deformation. The biodegradable polyurethane biocomposite also demonstrates relatively high thermal stability (Tmax at ~360 °C). The prepared material possesses a unique shape memory behavior, even after permanent deformation up to a > 500% strain, which may have great potential in several biomedical applications. View Full-Text
Keywords: chitosan; polycaprolactone; shape memory; stretchability; polyurethane; biocomposite chitosan; polycaprolactone; shape memory; stretchability; polyurethane; biocomposite

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material


Share & Cite This Article

MDPI and ACS Style

Gupta, A.; Kim, B.S. Shape Memory Polyurethane Biocomposites Based on Toughened Polycaprolactone Promoted by Nano-Chitosan. Nanomaterials 2019, 9, 225.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Nanomaterials EISSN 2079-4991 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top