【摘要】 采用醋酸乙烯酯、丙烯腈对氧化玉米淀粉进行化学改性,制得氧化乙酰氰乙基淀粉(即多元复合改性淀粉);研究了醋酸乙烯酯和丙烯腈的用量及配比对氧化乙酰氰乙基淀粉性能的影响;采用IR、SEM对氧化乙酰氰乙基淀粉的结构进行了表征,并用其进行了纸张表面施胶实验。实验表明,在以水为介质、反应体系pH值为9、反应温度30℃、醋酸乙烯酯和丙烯腈的总用量为6%(对氧化淀粉)、醋酸乙烯酯与丙烯腈的质量比分别为1:2、1:1和2:1时,得到的氧化乙酰氰乙基淀粉具有很好的表面施胶性能,与氧化淀粉相比,可显著提高纸张的表面强度、平滑度、耐折度和抗张强度。更多还原

【Abstract】 The oxidized acetyl cyanoethylated starch was synthesized with oxidized corn starch, vinyl acetate and acrylonitrile in alkaline medium when the pH was 9, the reaction temperature was 30℃ and the ratio of vinyl acetate to acrylonitrile was 1:2 to 2:1. The characteristic of the modified starch was analyzed with FT-IR, SEM. Comparing the surface sizing results of oxidized starch and the modified starch, it was found that the oxidized acetyl cyanoethylated starch with lower substitution degree was a more effective surface sizing agent compared with either the oxidized acetyl starch or the oxidized cyanoethylated starch. The surface strength, smoothness, folding endurance and tensile strength of the paper can be improved by surface sizing with the oxidized acetyl cyanoethylated starch.更多还原