Chemical synthesis of biological grafted starch with poly(N, N-dimethyl acrylamide) and poly(ethyl acrylate) structure for conferring superior paste stability, adhesion to cellulose-based cotton, film properties, and desizability

Abstract

This study mainly aimed to reveal the superiority of the positively charged poly(N, N-dimethyl acrylamide) (PC-PDMAA)/poly(ethyl acrylate) (PEA) structure to control poly(sodium allyl sulfonate) (PSAS)/PEA structure in enhancing the sizing properties (viscosity stability, adhesion to fibers (cellulose-based cotton and hydrophobic polyester), and film properties) and desizability of starch, and avoid desizing difficulty issue of positively charged PATAC-grafted starch, due to its worse desizing efficiency. Also, it aimed to survey the influence of grafting ratio on these properties, to develop a new biobased starch adhesive, PC-PDMAA-g-starch-g-PEA (PC-PDMAA-g-S-g-PEA), for the sizing of cotton and polyester. Under a similar grafting ratio, the PC-PDMAA-g-S-g-PEA (IV) showed significantly superior bonding to both fibers, film elongation and endurance (p < 0.05), and better paste stability and desizability compared to control PSAS-g-starch-g-PEA (PSAS-g-S-g-PEA, IV^#). This demonstrated that combining the PC-PDMAA/PEA branches could further enhance these properties of acid-thinned starch (ATS) compared to the PSAS/PEA branches. Bonding strengths, viscosity stability, desizability, film elongation, and film endurance of PC-PDMAA-g-S-g-PEA were strengthened with an increased grafting ratio from 0 % to 10.80 %. According to these findings, PC-PDMAA-g-S-g-PEA, a novel starch bio-based adhesive with a grafting ratio of 10.80 %, showed promise for use in cotton and polyester warp sizing.