摘要
The starch/polyvinyl alcohol(PVA)/microfibrillated cellulose(MFC)composite films were prepared using solution casting method after adding MFC into starch/PVA blend matrix.The effects of MFC content on the mechanical properties of starch/PVA composite films were investigated.As MFC content increases,the elongation at break and tensile strength increase firstly and then decrease.When the content of MFC is 2wt%,the tensile strength is 26.6 MPa and reaches the maximum.Through Fourier transform infrared(FTIR),scanning electron microscopy(SEM),X-ray diffraction(XRD)and thermogravimetric analysis(TGA),good dispersion of MFC in starch/PVA matrix at the loading of 2wt%,lower crystallinity of the starch/PVA/MFC films in comparison with starch/PVA blend and the effect of glass transition temperature increasing with MFC content from 0.5wt%to 4wt%can be found observed.And,incorporating MFC does not change the composition and crystal structure of the starch/PVA composite films.Thus,the reinforcing mechanism for the improvement of mechanical properties is attributed to the homogeneous dispersion of MFC with large aspect ratio,good compatibility and interfacial interactions between starch/PVA blend matrix and MFC.
基金
Funded by the National Natural Science Foundation of China(51903178)
the Graduate Program Construction Project Funding of Sichuan University(2017KCSJ036)。
