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Synthesis and characterization of copolymer obtained by grafting acrylamide onto hydrolyzed potato starch and its application in cotton yarn sizing were presented in this work. Some process parameters of starch hydrolysis and grafting, like as hydrolysis yield, grafting yield, grafting percentage, graft efficiency, and monomer to polymer conversion were determinated. Molar mass values of hydrolyzed starch and copolymer samples are located in a narrow range of 1 × 105to 1 × 107and 1 × 102to 1 × 104. Grafted hydrolyzed starch, as a sizing agent, gives better results than nongrafted, particularly in terms of sizing uniformity, yarn mechanical parameters, and easier removal in subsequent desizing process. [ABSTRACT FROM PUBLISHER]

The impact of the level of yarn twist on the size pick-up, abrasion resistance and breaking force of yarn was analyzed. A cotton yarn differing only in twist level was used for testing. The sizing process was carried out on a laboratory sizing machine. Sizing conditions were varied, namely the squeezing force and size recipe. According to the results obtained, the level of twist affects the size pick-up, abrasion resistance and breaking force. Based on the coefficient of correlation, it can be claimed that the level of twist in relation to the size pick-up and breaking force is very high, confirming that a very close correlation is systematically proved. [ABSTRACT FROM AUTHOR]