P(ATAC-co-AA) grafted branch is found to be able to toughen starch film.
P(ATAC-co-AA) grafted branch is preferred to PAA in improving the adhesion of starch.
P(ATAC-co-AA) grafted branch is superior to PATAC in keeping starch desizability.
Electroneutral starch-g-P(ATAC-co-AA) is proposed for cotton warp sizing.