Abstract
AbstractOxidized starch is an environmentally friendly sizing agent, but lacks adhesion to polyester yarns. In this study, hyperbranched poly(trimellitic glyceride)/oxidized starch (PTG/OS) as the composite sizing agent is used for sizing polyester yarns. The properties of sizing film, sizing paste, and sizing yarns are studied. When PTG content ranges from 2 to 10 wt%, tensile strength of PTGs/OS films are higher than that of oxidized starch film, and increase as molecular weight of PTG increase. Tensile strength of OS, PTG‐1/OS, PTG‐2/OS, and PTG‐3/OS films with 10 wt% PTG is 20.5, 22.4, 23.8, and 27.6 MPa, respectively. Apparent viscosity and viscosity stability of PTG/OS paste increases with the increase of PTG molecular weight. Breaking force, elongation at break and work‐to‐break of sizing polyester yarns by PTG/OS increase with the increase of PTG content in composite sizing agents, and the improvement on the tensile properties of sizing polyester yarns by PTG/OS becomes better with increase of PTG molecular weight. It is attributed to the stronger affinity among oxidized starch, PTG and polyester, which is verified by FT‐IR, XPS, and SEM. Oxidized starch blended hyperbranched poly(trimellitic glyceride) has the potential application for sizing polyester yarns in weaving process.
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