Fig. 3From: Palm kernel oil-based polyester polyurethane composites incorporated with multi-walled carbon nanotubes for biomedical application a Stress–strain curves of PU and PU-MWNT films at different loadings, optical micrographs of; b PU film, c PU-MWNT01 film, d PU-MWNT04 film, and e PU-MWNT08 film. Scale bars represent 100 µmBack to article page