Nanostructured biocomposites based on unsaturated polyester resin and a cellulose nanofiber network

QC 20151029
Biocomposites reinforced by natural plant fibers tend to be brittle, moisture sensitive and have limited strength. Wood cellulose nanofibers (CNF) were therefore used to reinforce an unsaturated polyester matrix (UP) without the need of coupling agents or CNF surface modification. The nanostructured CNF network reinforcement strongly improves modulus and strength of UP but also ductility and toughness. A template-based prepreg processing approach of industrial potential is adopted, which combines high CNF content (up to 45 vol%) with nanoscale CNF dispersion. The CNF/UP composites are subjected to moisture sorption, dynamic thermal analysis, tensile tests at different humidities, fracture toughness tests and fractography. The glass transition temperature (T-g) increases substantially with CNF content. Modulus and strength of UP increase about 3 times at 45 vol% CNF whereas ductility and apparent fracture toughness are doubled. Tensile properties at high humidity are compared with other bio-composites and interpreted based on differences in molecular interactions at the interface.

Skrifvars, Mikael,1962-Högskolan i Borås,Akademin för textil, teknik och ekonomi,Polymerteknologi(Swepub:hb)MSK (författare)
Berglund, LarsKTH,Biokompositer,Wallenberg Wood Science Center(Swepub:kth)u1wqz3r1 (författare)
KTHBiokompositer (creator_code:org_t)

Ingår i:Composites Science And Technology: Pergamon Press117, s. 298-3060266-35381879-1050

Av författaren/redakt...: Ansari, Farhan; Skrifvars, Mikae ...; Berglund, Lars

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Polymerteknologi

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

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