Interface tailoring through covalent hydroxyl-epoxy bonds improves hygromechanical stability in nanocellulose materials

Ansari, FarhanKTH,Biokompositer,KTH Royal Institute of Technology, Sweden (författare)

QC 20160906
Wide-spread use of cellulose nanofibril (CNF) biocomposites and nanomaterials is limited by CNF moisture sensitivity due to surface hydration. We report on a versatile and scalable interface tailoring route for CNF to address this, based on technically important epoxide chemistry. Bulk impregnation of epoxide-amine containing liquids is used to show that CNF hydroxyls can react with epoxides at high rates and high degree of conversion to form covalent bonds. Reactions take place inside nanostructured CNF networks under benign conditions, and are verified by solid state NMR. Epoxide modified CNF nanopaper shows significantly improved mechanical properties under moist and wet conditions. High resolution microscopy is used in fractography studies to relate the property differences to structural change. The cellulose-epoxide interface tailoring concept is versatile in that the functionality of molecules with epoxide end-groups can be varied over a wide range. Furthermore, epoxide reactions with nanocellulose can be readily implemented for processing of moisture-stable, tailored interface biocomposites in the form of coatings, adhesives and molded composites.

Lindh, Erik L.RISE,KTH,Tillämpad fysikalisk kemi,Wallenberg Wood Science Center,Innventia AB, Sweden,Innventia,KTH Royal Institute of Technology, Sweden(Swepub:kth)u1851dwm (författare)
Furo, IstvanKTH,Tillämpad fysikalisk kemi,KTH Royal Institute of Technology, Sweden(Swepub:kth)u1a9c3pb (författare)
Johansson, Mats K.G.KTH,Ytbehandlingsteknik,KTH Royal Institute of Technology, Sweden(Swepub:kth)u1oqmcv9 (författare)
Berglund, Lars A.KTH,Biokompositer,Wallenberg Wood Science Center,KTH Royal Institute of Technology, Sweden(Swepub:kth)u1wqz3r1 (författare)
KTHBiokompositer (creator_code:org_t)

Ingår i:Composites Science And Technology: Elsevier BV134, s. 175-1830266-35381879-1050

Av författaren/redakt...: Ansari, Farhan; Lindh, Erik L.; Furo, Istvan; Johansson, Mats ...; Berglund, Lars A ...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Pappers massa oc ...

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