Abstract

To investigate the effects of hydrophilic poly(acrylic acid) (PAA) branches grafted onto the backbones of acetate starch on the sizing performance, a series of acetate starch-g-poly(acrylic acid) (AS-g-PAA) with different grafting ratio of 6.71–10.04% were prepared by graft copolymerization in an aqueous medium. The effect of grafting conditions on grafting ratio and efficiency were investigated. The adhesion was evaluated by measuring the bonding force of starch to the fibers and the abrasion resistance of sized polyester yarn, whereas the film properties were investigated in terms of tensile strength, breaking elongation, degree of crystallinity, and swelling capacity. It was confirmed that the PAA branch can effectively improve the adhesion ability of acetate starch to polyester fibers, film mechanical characters, and also enhance the abrasion resistance of polyester yarns to 148.9%. The degree of crystallinity of the acetate starch film was decreased which led to mitigate the brittleness of film. The SEM observations confirm that the fibers in the yarn fit snugly together after sizing. The AS-g-PAA showed great potentiality for the application in polyester warp sizing.

摘要

为了研究接枝到醋酸淀粉主链上的亲水性聚丙烯酸酯（PAA）支链对施胶性能的影响，一系列接枝不同的醋酸淀粉-g-聚丙烯酸（AS-g-PAA）通过在水性介质中进行接枝共聚反应，可得到6.71-10.04％的比例。研究了接枝条件对接枝率和效率的影响。通过测量淀粉对纤维的粘合力和上浆聚酯纱线的耐磨性来评估粘合性，而在拉伸强度，断裂伸长率，结晶度和溶胀能力方面研究膜性能。证实了PAA支链可以有效提高醋酸淀粉与聚酯纤维的粘合能力，薄膜的机械性能，并且还将聚酯纱线的耐磨性提高到148.9％。乙酸淀粉膜的结晶度降低，这减轻了膜的脆性。SEM观察证实，上浆后纱线中的纤维紧密贴合在一起。AS-g-PAA在聚酯经纱上浆中显示出巨大的应用潜力。