Rheology and wettability of chitosan/hydroxypropyl cellulose blend materials

This paper deals with the rheological behavior and wetting power of chitosan/ hydroxypropyl cellulose(HPC) blend materials.Measuring the viscosity and shear stress of the blend solution by RVDV-ⅡPRO viscosimeter,the influences of composition and temperature on the rheological behavior of blend solution were observed,respectively.The contact angle(CA) of the film was measured by a K100 automatic surface tensiometer to investigate the chitosan / HPC blend materials wetting power.The results showed that almost all the mass ratio blend solutions belong to non-Newtonian fluid except the blends with mass fraction of not higher than 1% HPC and not higher than 1% chitosan-Newtonian fluid.The blend viscosity falls as temperature rises.The contact angle minimum is in the sequence as that of methanol that of ethylene glycol that of N,N-dimethylformamide that of distilled water at 20 ℃.Temperature change can make water CA decrease obviously,and the CA values are in the order of that: 20 ℃40 ℃30 ℃ when the mass fraction of HPC is below 0.25%.The pH rising or falling a little more can both lead to the CA falling.When the mass fraction of HPC in blend material was in 0-1%,the water CA changes from 71.04 ° to 55.38 °.