Cellulose nanocrystal/amino-aldehyde biocomposite films

Sebestyén Nagy; Emília Csiszár; Dávid Kun; Béla Koczka

doi:10.1016/j.carbpol.2018.04.025

Cellulose nanocrystal/amino-aldehyde biocomposite films

Carbohydr Polym. 2018 Aug 15:194:51-60. doi: 10.1016/j.carbpol.2018.04.025. Epub 2018 Apr 6.

Authors

Sebestyén Nagy¹, Emília Csiszár², Dávid Kun³, Béla Koczka⁴

Affiliations

¹ Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111 Budapest, Műegyetem rkp. 3., Hungary.
² Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111 Budapest, Műegyetem rkp. 3., Hungary. Electronic address: ecsiszar@mail.bme.hu.
³ Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1111 Budapest, Műegyetem rkp. 3., Hungary; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Magyar tudósok körútja 2., Hungary.
⁴ Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, H-1111 Budapest, Szt. Gellért tér 4., Hungary.

PMID: 29801858
DOI: 10.1016/j.carbpol.2018.04.025

Abstract

From the suspensions of cellulose nanocrystals (CNCs) derived from cotton and flax by acidic hydrolysis, transparent and smooth films were produced with different plasticizers and an amino-aldehyde based cross-linking agent in a wide composition range by a simultaneous casting and wet cross-linking process. The effect of cross-linker concentration on the optical and tensile properties and on the morphology of CNC films was investigated by various measurements. The interaction of films with liquid water and water vapour was also characterized by water sorption and water contact angle as well as performing a sinking test. Cross-linking improved the transparency, reduced the porosity and surface free energy, and prevented the delamination of CNC films in water at a concentration of 10% or higher. The surface of CNC films is basic in character and has an electron donor property. The CNC/amino-aldehyde films had a high tensile strength (45 MPa) and modulus (11 GPa).

Keywords: Amino-aldehyde based cross-linking; CNC films; Cellulose nanocrystals (CNCs); Morphology; Surface energetics; Water resistance.

MeSH terms

Adsorption
Aldehydes / chemistry*
Biocompatible Materials / chemistry*
Cellulose / chemistry*
Cross-Linking Reagents / chemistry*
Nanoparticles / chemistry*
Water / chemistry

Substances

Aldehydes
Biocompatible Materials
Cross-Linking Reagents
Water
Cellulose