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• FP- g -PSAS is prepared by building an APS/-SH groups redox system and characterized. • FP- g -PSAS shows strong adhesion to viscose and cotton fibers at 60 °C. • FP- g -PSAS as a new adhesive fulfills high-valued utilization of feather waste. • FP- g -PSAS can be used as a new bio-based protein sizing agent. Fulfilling high-valued utilization of feather wastes will favor overcoming environmental issues and promoting the poultry farmers' income. This study developed a new bio-based protein sizing agent [feather protein- g -poly(sodium allyl sulfonate) (FP- g -PSAS)] with high adhesion capacity to viscose and cotton fibers at low temperature, through graft copolymerization of feather protein with SAS monomer by building an ammonium persulfate (APS)/ SH groups (on the protein chains) redox system. Fourier transform infrared (FTIR) spectroscopy and energy dispersive x-ray spectrometer (EDS) demonstrated the successful preparation of FP- g -PSAS samples. The samples were also characterized by scanning electron microscopy (SEM), thermogravimetric (TG) and x-ray diffraction (XRD). Viscosity, water-solubility, light transmittance and adhesion of the samples were investigated. The FP- g -PSAS exhibited high water-solubility and light transmittance. Compared with feather protein, an increased viscosity and an improved adhesion to both fibers for FP- g -PSAS samples were exhibited at 60 °C. With the rises in grafting ratios, viscosity and adhesion strengths to both fibers gradually increased. The FP- g -PSAS samples had the similar adhesion strengths in comparison with the modified starches investigated in our previous works. These results indicated that FP- g -PSAS showed the potential in the application of viscose and cotton warp sizing at a low temperature of 60 °C. [ABSTRACT FROM AUTHOR]

Unlabelled Image • Graft polymerization of feather protein with AA and PMA, respectively, for improving its adhesion to PLA fibers. • The PAA- g -FP- g -PMA can significantly improving the adhesion of feather protein to PLA fibers. • The PAA- g -FP- g -PMA is superior to FP- g -P(AA- co -MA) in improving the adhesion. • The PAA- g -FP- g -PMA used as an adhesive in warp sizing favors fulfilling the high-valued utilization of feather wastes. [ABSTRACT FROM AUTHOR]