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Biobased thermoplastic elastomer with seamless 3D-Printability and superior mechanical properties empowered by in-situ polymerization in the presence of nanocellulose
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-4485-2155
Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
Korea Res Inst Chem Technol, Res Ctr Biobased Chem, Ulsan 44429, South Korea..
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2020 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 185, article id 107885Article in journal (Refereed) Published
Abstract [en]

A biobased and biocompatible thermoplastic elastomer (TPE) with superior 3D printability was demonstrated with great potential for customized manufacturing technologies and fabrication of biointegrated devices. The inherent structural and stereochemical disadvantages of biobased monomers, such as 2,5-furandicarboxylic acid, in comparison with today used petroleum based monomers like terephthalic acid generally lead to lower mechanical performance for the biobased replacement polymers. This is additionally enhanced by poor interfacial adhesion and fusion commonly encountered during customized manufacturing technologies like 3D printing. Herein, we demonstrate that in-situ polymerization in the presence of trace amounts of cellulose nanocrystals (CNCs) can homogeneously distribute the nanofiller leading to dramatically strengthened thermally 3D-printable bio-furan-based TPE. This TPE exhibited a tensile strength of 67 MPa which is 1.5-7-fold higher than the values reported for silicone and thermoplastic urethane, which are widely used in biomedical applications. In addition, the TPE had an impressive extensibility of 860% and negligible in vivo cytotoxicity; such properties have not been reported to date for bio-based or petrochemical TPEs. While a petrochemical 3D printed TPE counterpart retained only half of the tensile strength compared to the hot-pressed analogue, the 3D-printed biobased TPE insitu modified with nanocellulose maintained 70-80% of its strength under the same experimental conditions. This is explained by inter-diffusion between interfaces facilitated by the nanocellulose and the furan rings. Using the ergonomic shape of a wrist as a 3D-printable design, we successfully manufactured a wearable thermal therapeutic device from the nanocellulose modified biobased TPE, giving promise for wide variety of future applications.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2020. Vol. 185, article id 107885
Keywords [en]
Polymers, Flexible composite, Nano composites, Mechanical properties, 3D-printing
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-266425DOI: 10.1016/j.compscitech.2019.107885ISI: 000503090500001Scopus ID: 2-s2.0-85074799210OAI: oai:DiVA.org:kth-266425DiVA, id: diva2:1387437
Note

QC 20200121

Available from: 2020-01-21 Created: 2020-01-21 Last updated: 2020-01-21Bibliographically approved

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Koo, Jun MoHakkarainen, Minna

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